The Impact of Reminiscence on Autobiographical Memory, Cognition and Psychological Well-Being in Healthy Older Adults Research Reports The Impact of Reminiscence on Autobiographical Memory, Cognition and Psychological Well-Being in Healthy Older Adults Andrew P. Allen a, Caoilainn Doyle b, Richard A. P. Roche* b [a] Trinity College Dublin, Dublin, Ireland. [b] Department of Psychology, Maynooth University, Maynooth, Ireland. Abstract Reminiscence therapy has improved autobiographical memory in older adults with memory impairment. However, there has been a relative lack of research examining the impact of reminiscence interventions on healthy older adults, despite the fact that healthy ageing has been associated with a reduction in episodic autobiographical memory. The current study examined the effects of a semi-structured reminiscence program, compared to a no-intervention control and an active control group focused on current life, in healthy older adults. Before and after reminiscence or control, we assessed episodic and semantic autobiographical memory, as well as reliving of the memory and re- experiencing the emotion associated with the memory. We also examined new learning and executive function, as well as quality of life, satisfaction with life, anxiety, depression, and mood. The reminiscence intervention did not lead to a differing impact on autobiographical memory, cognition or psychological well-being, compared to the control groups. The current results indicate that simple reminiscence does not lead to enhanced autobiographical memory performance in healthy older adults. Keywords: memory, reminiscence, autobiographical memory, episodic memory, ageing Europe's Journal of Psychology, 2020, Vol. 16(2), 317–330, https://doi.org/10.5964/ejop.v16i2.2097 Received: 2019-08-04. Accepted: 2019-11-08. Published (VoR): 2020-05-29. Handling Editor: Vlad Glăveanu, Department of Psychology and Counselling, Webster University Geneva, Geneva, Switzerland *Corresponding author at: Department of Psychology, John Hume Building, Maynooth University, W23 F2H6, Republic of Ireland. E-mail: Richard.Roche@mu.ie This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International License, CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Healthy ageing is a key aim of public health policy. For ageing adults, loss of memory function in general is a source of anxiety; this is a likely explanation for the finding that memory lapses in vignettes tended to be attributed more to greater mental difficulty, if the vignette’s protagonist was an older person rather than a younger person (Erber, Szuchman, & Rothberg, 1990). Despite broad evidence that cognitive training and mental stimulation can benefit cognition in healthy older adults (Kelly et al., 2014), there has been a relative paucity of research on enhancing long-term memory, including autobiographical memories from across the lifespan. Autobiographical memory interacts closely with our sense of self (e.g. Conway & Pleydell-Pearce, 2000; Prebble, Addis, & Tippett, 2013), and reminiscence about autobiographical memory may serve a number of functions in healthy ageing, such as building intimacy with others or communicating advice (Cappeliez, O’Rourke, & Chaudhury, 2005). There is thus need for more research on the impact of reminiscence on autobiographical memory in healthy older adults. Europe's Journal of Psychology ejop.psychopen.eu | 1841-0413 https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/ https://ejop.psychopen.eu/ https://ejop.psychopen.eu/ https://www.psychopen.eu/ Cross-sectional evidence indicates that episodic aspects of autobiographical memory (i.e. those relating to spe- cific occurrences located in a specific place and time) may be more diminished with ageing (or less preferred in verbal reports of memory) compared to semantic aspects (i.e. those aspects of memory relating to general knowledge of one’s autobiography; Levine, Svoboda, Hay, Winocur, & Moscovitch, 2002; St. Jacques & Levine, 2007). This suggests there may be specific effects of ageing on different components of autobiographical memory. Previous research involving people with memory impairment has indicated that reminiscence can improve autobiographical memory (e.g. Lopes, Afonso, & Ribeiro, 2016; Meléndez, Torres, Redondo, Mayordomo, & Sales 2017). Another study did not find an overall effect, although higher engagement with reminiscence was associated with improved autobiographical memory (Woods et al., 2016). There is also evidence that reminiscence can improve mood and depressive symptoms in older adults living in long-term residential care (Wang, 2005), and we have previously suggested that positive effects of reminiscence on autobiographical memory might be mediated by effects on mood and executive function (Allen, Doyle, Commins, & Roche, 2018). Despite this promising research in people with memory impairment, there has been a relative lack of research examining the effects of reminiscence on autobiographical memory in healthy older adults with a lack of cognitive impairment. Memory can decline even in healthy ageing, albeit with differing effects on differing forms of memory (e.g. Hedden & Gabrieli, 2004). It is thus of interest whether reminiscence can have beneficial effects on cognition and psychological well-being, particularly autobiographical memory. One study that did examine reminiscence and autobiographical memory in healthy older adults tested the effects of both oral reminiscence and autobiographical writing (de Medeiros, Mosby, Hanley, Pedraza, & Brandt, 2011); their results suggested a lack of change in autobiographical memory performance. In the current study, we evaluated the effect of a reminiscence intervention on autobiographical memory, new learning and executive function, as well as self-reported memory and psychological well-being. In contrast to de Medeiros et al., we assessed memory for a wider range of life epochs; de Medeiros et al. employed three (childhood, early adult life, and recent life), whereas we examined five (0-15, 15-30, 31-45 years of age, 46 years of age-last 5 years, last 5 years). The period from 15-30 years in particular approximately aligns with what is referred to as the reminiscence bump, a period in life from adolescence to early adulthood that tends to be well-remembered compared to other periods of life by middle-aged and older adults (e.g. Conway & Rubin, 1993; Jansari & Parkin, 1996). Furthermore, instead of two different reminiscence conditions, we employed an active control that was more focused on the present/future than the past, in order to control for factors such as social contact within a group setting and level of attention from the project staff. We also included a waiting list control to quantify the effects of repeated testing with no intervention. For autobiographical memory, in addition to semantic and episodic memory performance, we assessed autonoetic aspects of autobiographical memories. These are subjective mental “time travel” aspects of memory (e.g. Wheeler, Stuss, & Tulving, 1997), which have been demonstrated to differ between younger and older participants (Piolino et al., 2006) and to differ within older adults depending on time of encoding (Luchetti & Sutin, 2018). To assess autonoetic aspects of autobiographical memory, we specifically assessed self-reported extent of reliving the memory and re-experiencing the emotion associated with the memory. Reminiscence and Autobiographical Memory 318 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 https://www.psychopen.eu/ Our key hypothesis was that reminiscence would be associated with heightened episodic autobiographical memory performance, as well as increased re-experiencing of autobiographical memory, compared to the ac- tive control and waiting list control. We also hypothesized that reminiscence would be associated with improved cognitive performance (better performance on tests of executive function and verbal learning) and self-reported psychological well-being (enhanced quality of life, satisfaction with life, positive affect, and reduced negative affect, anxiety, and depression). Method This research received ethical approval from the Maynooth University research ethics committees. All partici- pants provided informed consent before beginning their participation in the project. The methods and primary outcome measures of this study were pre-registered at Open Science Framework (see Supplementary Materi- als). Design This study employed a mixed factorial design, with reminiscence condition as the between-participants factor and pre- and post-assessment as the within-participants factor. Participants were randomly assigned on a per-site basis to one of three conditions (reminiscence therapy, active control group, waiting list control group). Those in the control groups were offered participation in a reminiscence group following their completion of the post-control research visit. Materials Autobiographical memory was assessed using the Episodic Autobiographical Memory Interview (EAMI; Irish, Lawlor, O’Mara, & Coen, 2008, 2010, 2011). This interview assesses episodic and semantic autobiographical memory, as well as autonoetic aspects of autobiographical memory, for five different life epochs (0-15, 15-30, 31-45 years of age, 46 years of age-last 5 years, last 5 years). Participants were requested to think of different memories than what they had discussed at baseline, or during any reminiscence sessions, when they completed the EAMI for a second time, following the intervention/waiting list. We requested this in order to avoid participants building on any rehearsal of memories they had recently retrieved. New verbal learning was assessed with the Rey Auditory Verbal Learning Test (RAVLT; Schmidt, 1996). This assesses learning of a 15-word list; there are five trials in which the list is read and participants are required to recall as many words as they can in any order. These five trials are followed by one trial of an interference list. Participants are then requested to recall as many words from the first list, both immediately after the interference trial and at delay (following completion of the EAMI). We also assessed two aspects of executive function; response inhibition and verbal fluency. We assessed response inhibition using a computerised colour-naming Stroop task (Balota et al., 2010; Doyle, Smeaton, Roche, & Boran, 2018), presented using E-prime®. Participants were presented with a series of words and asked to name the colour of ink in which they were presented. Although previous research also included a word-naming block, we omitted this to reduce participant burden. We assessed verbal fluency from the Allen, Doyle, & Roche 319 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 https://www.psychopen.eu/ Montreal Cognitive Assessment (MoCA; Nasreddine et al., 2005); participants were required to think of as many words beginning with “F” as they could (or “A” for the parallel version) in one minute. We employed a number of self-report measures of subjective quality of life and satisfaction with life, mental health and affect; these were the Control, Autonomy, Self-realisation and Pleasure quality of life questionnaire (CASP-19; Netuveli, Wiggins, Hildon, Montgomery, & Blane, 2006); Satisfaction With Life Scale (SWLS; Diener, Emmons, Larsen, & Griffin 1985), Beck Depression Inventory (BDI; Beck, Steer, & Brown, 1996), Spielberger Trait Anxiety Inventory (STAI; Spielberger, Gorsuch, Lushene, Vagg, & Jacobs, 1983), and Positive and Nega- tive Affect Schedule (PANAS; Watson, Clark, & Tellegen, 1988). Participants We included 36 participants in the analysis for this study; one participant was excluded following baseline as- sessment due to evidence of cognitive impairment. We assigned 14 to the reminiscence condition (10 females, 4 males; Mage = 69, SEM = 1.3), 11 to the active control (10 female, 1 male, Mage = 68.8, SEM = 1.5) and 11 to the no-intervention control (8 female, 3 male, Mage = 71.9, SEM = 2.0). All participants identified as White Irish. Participants were recruited from Dublin and surrounding counties in the Republic of Ireland, via flyers and newspaper advertisements, as well as via community groups (e.g. active ageing groups, men’s sheds). All participants were over 60 years of age. Exclusion criteria were as follows: severe visual impairments; history of psychological/neurological impairment, severe head trauma resulting in loss of consciousness, history of epilepsy, currently taking psychoactive medication, other relevant medical conditions, history of drug or alcohol problems (See Figure 1 for recruitment flowchart). Figure 1. Recruitment flowchart. Interventions The reminiscence and active control interventions were delivered in small groups of three to seven participants at a number of different venues. The reminiscence and active control groups comprised six weekly sessions, each lasting one hour. The reminiscence groups used a simple reminiscence approach, adapted from the “re- membering yesterday, caring today” program (Schweitzer & Bruce, 2008). This program was used in previous research examining autobiographical memory as an outcome (Woods et al., 2016). The sessions were more conversation-based than the “remembering yesterday, caring today”, which had a stronger focus on hands-on Reminiscence and Autobiographical Memory 320 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 https://www.psychopen.eu/ activities for working with clients with memory problems. We did not target a specific function of reminiscence as we were interested in observing which functions of reminiscence would emerge in the group context. For the reminiscence groups, in addition to autobiographical memories, participants were prompted to discuss memories of historical events in the public sphere (e.g. John F. Kennedy’s visit to Ireland in the 1960’s, economic recession in Ireland in the 1980’s). For the active control groups, the topics of discussion were approximately matched to the content of the reminiscence groups, but with a focus on the present and future. For example, the active control group discussed learning new things whilst the reminiscence group discussed schooldays. As certain topics were more likely to provoke discussion of different epochs in autobiographical memory, the order of topics for the groups were reversed for half the groups (i.e. half of the reminiscence groups completed the sessions in one order, and the other half of the reminiscence groups completed them in the opposite order). The order of topics was similarly reversed for half of the active control groups. The weekly topics for the reminiscence group and active control group are outlined in Table 1 below. Table 1 Session Topics for Reminiscence Group and Active Control Session Reminiscence group Active control Session 1 Introduction, childhood and family life Introduction, health and well-being Session 2 Schooldays Continued education/learning new skills Session 3 Historical session A Current affairs (national) Session 4 Homes, gardens and animals, going out and having fun Holidays and celebrations Session 5 Historical session B Current affairs (international) Session 6 Weddings, babies, children, rounding up Family life, grandchildren, relationships, rounding up Reminiscence sessions were recorded, and, with participants’ permission, highlights from the reminiscence groups were added to an online archive at the Digital Repository of Ireland (see Supplementary Materials). Participants were encouraged to listen to previous entries in the archive, to help trigger memories of their own. Procedure Participants completed the cognitive measures in a small testing room one at a time. This testing session lasted approximately 60-90 minutes. Participants completed the questionnaires in their own time prior to the first group session. After completing the reminiscence/active control group, or waiting an equivalent amount of time in the waiting list condition, participants completed the same measures again, 6-8 weeks after the baseline testing session. Parallel versions of tests were used wherever available for the post-intervention study visit, to minimise learning or other carryover effects. Statistical Analysis Where assumptions of parametric data were violated, we transformed variables using a square root transforma- tion; where that transformation did not make the data parametric then a natural log transformation was used. Data for participants who competed the baseline assessment but were lost to follow-up were imputed using last observation carried forward. Allen, Doyle, & Roche 321 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 https://www.psychopen.eu/ We used ANCOVA for the primary outcome (autobiographical memory) and MANCOVA (using Roy’s largest root; see Field, 2009) for the secondary outcomes, which were executive function (verbal fluency and Stroop effect reaction time), verbal learning (RAVLT performance indices) and psychological well-being (quality of life, satisfaction with life, depression, anxiety, positive and negative affect). We employed reminiscence condition and pre-post assessment as predictors and age as a covariate. We assessed the interaction between the two predictors to determine if the change in outcome from baseline to post-intervention differed between the reminiscence group and the control conditions. We also examined whether there was a main effect of life epoch on autobiographical memory. Results Autobiographical Memory Autobiographical memory was the primary outcome assessed within this study. There was a significant interac- tion between pre-post assessment and reminiscence condition for episodic memory, F(2, 32) = 3.98, p = .03, ηp2 = .2; this was due to a fall in episodic memory retrieval in the active control group, rather than a change in the reminiscence group. There was no significant main effect of reminiscence condition, F(2, 32) = 0.72, p = .49, ηp2 = .04. However, there was a main effect of pre-post assessment, F(1, 32) = 6.46, p = .02, ηp2 = .17, with participants performing slightly worse at post-intervention regardless of reminiscence condition (see Figure 2A). Figure 2. Autobiographical memory pre- and post-intervention condition. Note. (A) - episodic memory, (B) - semantic memory, (C) - re-experiencing emotion, (D) - reliving the memory. Estimated marginal means adjusted for covariate (age) are reported. Error bars represent standard error of the mean. Reminiscence and Autobiographical Memory 322 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 https://www.psychopen.eu/ There was no significant effect of reminiscence condition on semantic autobiographical memory; there no significant interaction between pre-post assessment and reminiscence condition, F(2, 32) = 2.67, p = .09, ηp2 = .14, nor was there a main effect of reminiscence condition, F(2, 32) = 0.54, p = .59, ηp2 = .03 or pre-post assessment, F(1, 32) = 0.08, p = .78, ηp2 = .002 (see Figure 2B). Despite an increase in the no intervention condition, there was no significant interaction between pre-post assessment and reminiscence condition for extent of re-experiencing emotion associated with autobiographical memory, F(2, 32) = 2.49, p = .1, ηp2 = .14. There was a marginally significant main effect of pre-post assess- ment, F(1, 32) = 4.16, p = .05, ηp2 = .12, with participants generally reporting higher levels of re-experiencing emotion at post-intervention. There was no significant main effect of reminiscence condition on re-experiencing emotion, F(2, 32) = 0.94, p = .4, ηp2 = .06 (see Figure 2C). There was no significant interaction between pre-post assessment and reminiscence condition for extent of reliving the memory, F(2, 32) = 0.2, p = .82, ηp2 = .01. There was a marginally significant main effect of pre-post assessment, F(1, 32) = 3.89, p = .06, ηp2 = .11, with participants generally reporting lower levels of reliving the memory at post-intervention. There was no significant main effect of reminiscence condition on reliving the memory, F(2, 32) = 1.03, p = .37, ηp2 = .06 (see Figure 2D). There was some evidence of lower autobiographical memory performance for the childhood period (0-15 years), although there was no significant main effect of life epoch on episodic memory, F(4, 128) = 0.69, p = .60, ηp2 = .02 (see Figure 3A), or semantic memory, F(3.05, 97.52) = 0.67, p = .57, ηp2 = .02 (Green- house-Geisser adjusted; see Figure 3B). Figure 3. Autobiographical memory across epoch for (A) - episodic memory, (B) - semantic memory, (C) - re-experiencing emotion, (D) - reliving the memory. Note. Estimated marginal means adjusted for covariate (age) are reported. Error bars represent standard error of the mean. Allen, Doyle, & Roche 323 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 https://www.psychopen.eu/ Life epoch did have a main effect on re-experiencing of emotion, F(4, 104) = 3.14, p = .02, ηp2 = .11, with participants reporting less re-experiencing of emotion for childhood memories (see Figure 3C). Despite a simliar trend for reliving of the event, there was not a significant main effect of life epoch, F(4, 104) = 2.2, p = .07, ηp2 = .08 (see Figure 3D). These main effects were not significantly moderated by condition or pre-post assessment. Cognition Using Roy’s Largest Root, there was no significant interaction between pre-post assessment and reminiscence condition for executive function (verbal fluency and Stroop effect RT), Θ = .12, F(2, 28) = 1.72, p = .2, ηp2 = .11. There was no significant main effect of pre-post assessment Θ = .03, F(2, 27) = 0.35, p = .71, ηp2 = .03, nor was there a significant main effect of reminiscence condition, Θ = .17, F(2, 28) = 2.32, p = .12, ηp2 = .14 (see Table 2). Table 2 Executive Function Before and After Reminiscence Intervention and Control Conditions Outcome / Condition Pre Post Verbal fluency (words produced) Reminiscence 16.28 (1.31) 16.25 (1.19) Active Control 14.04 (1.34) 12.48 (1.21) No intervention 14.14 (1.57) 11.74 (1.42) Stroop effect RT (ms) Reminiscence 201.94 (32.46) 192.45 (42.59) Active Control 178.88 (33.07) 165.62 (43.39) No intervention 193.97 (38.97) 118.04 (51.12) Note. Estimated marginal means reported; Standard error of the mean in parentheses. There was no significant interaction between pre-post assessment and reminiscence condition for new learn- ing, Θ = .23, F(7, 27) = 0.88, p = .53, ηp2 = .19. There was no significant main effect of pre-post assessment, Θ = .31, F(7, 26) = 1.15, p = .37, ηp2 = .24, nor was there a main effect of reminiscence condition, although this approached significance, Θ = .57, F(7, 27) = 2.21, p = .07, ηp2 = .36. (see Table 3). Table 3 New Verbal Learning Before and After Reminiscence Intervention and Control Conditions Outcome / Condition Pre Post RAVLT trial 1 correct Reminiscence 6.18 (0.41) 6.73 (0.36) Active Control 5.75 (0.46) 5.87 (0.4) No intervention 6.4 (0.47) 5.8 (0.41) RAVLT trial 5 correct Reminiscence 11.64 (0.64) 11.22 (0.57) Active Control 10.82 (0.71) 10.82 (0.63) No intervention 10.82 (0.73) 10.26 (0.65) Reminiscence and Autobiographical Memory 324 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 https://www.psychopen.eu/ Outcome / Condition Pre Post RAVLT trial 6 correct Reminiscence 9.78 (0.73) 9.04 (0.8) Active Control 8.22 (0.82) 7.71 (0.89) No intervention 8.06 (0.84) 7.7 (0.91) RAVLT delayed recall correct Reminiscence 10.03 (0.85) 8.38 (0.87) Active Control 8.66 (0.95) 7.52 (0.97) No intervention 8.39 (0.97) 7.18 (1) RAVLT learning Reminiscence 5.47 (0.74) 4.49 (0.62) Active Control 5.07 (0.83) 4.95 (0.69) No intervention 4.42 (0.86) 4.42 (0.71) RAVLT forgetting Reminiscence 0.13 (0.06) 0.25 (0.06) Active Control 0.2 (0.06) 0.31 (0.07) No intervention 0.25 (0.06) 0.34 (0.07) RAVLT interference Reminiscence 0.16 (0.05) 0.19 (0.06) Active Control 0.24 (0.06) 0.29 (0.07) No intervention 0.26 (0.06) 0.28 (0.07) RAVLT total repeats Reminiscence 4.4 (0.98) 3.16 (0.7) Active Control 2.98 (1.09) 4.33 (0.8) No intervention 3.15 (1.12) 3.56 (0.82) Note. Estimated marginal means reported; Standard error of the mean in parentheses. Psychological Well-Being There was no significant interaction between pre-post assessment and reminiscence condition for psychologi- cal well-being, Θ = .14, F(6, 14) = 0.33, p = .91, ηp2 = .12. There was no significant main effect of pre-post assessment, Θ = .92, F(6, 13) = 1.99, p = .14, ηp2 = .48, nor was there a main effect of reminiscence condition, although this approached significance, Θ = 1.2, F(6, 14) = 2.8, p = .053, ηp2 = .55 (see Table 4). Table 4 Psychological Well-Being Before and After Reminiscence Intervention and Control Conditions Outcome / Condition Pre Post Positive affect Reminiscence 37.7 (2.12) 40.71 (2.29) Active Control 35.5 (2.51) 40.24 (2.7) No intervention 37.8 (2.19) 39.6 (2.36) Negative affect Reminiscence 14.76 (1.77) 14.11 (1.25) Active Control 14.19 (2.1) 13.61 (1.48) No intervention 15.98 (1.84) 17.55 (1.29) Allen, Doyle, & Roche 325 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 https://www.psychopen.eu/ Outcome / Condition Pre Post Depression Reminiscence 5.93 (1.84) 5.04 (1.86) Active Control 7.52 (2.17) 7.65 (2.2) No intervention 7.56 (1.9) 7.47 (1.92) Anxiety Reminiscence 33.13 (2.83) 29.83 (2.65) Active Control 30.46 (3.35) 29.93 (3.13) No intervention 33.41 (2.93) 31.59 (2.74) Quality of life Reminiscence 41.81 (1.02) 40.54 (1.09) Active Control 39 (1.21) 37.91 (1.29) No intervention 41.43 (1.06) 40.74 (1.13) Satisfaction with life Reminiscence 28.07 (1.1) 29.06 (1.51) Active Control 26.48 (1.3) 27.27 (1.79) No intervention 25.45 (1.14) 25.64 (1.56) Note. Estimated marginal means reported; Standard error of the mean in parentheses. Discussion The current findings do not suggest that reminiscence affects autobiographical memory in healthy older adults, compared to an active control and no intervention control. This is consistent with previous research contrasting oral and written reminiscence (de Medeiros et al., 2011). There was also a lack of evidence that reminiscence was associated with better performance on other cognitive tasks, or with improved psychological well-being. Cognitive performance and psychological well-being were generally good at baseline, and, in the case of semantic autobiographical memory, quite close to ceiling, consistent with previous evidence that semantic autobiographical memory is well preserved in healthy ageing (Levine et al., 2002; St. Jacques & Levine, 2007). Thus, although the current study had a low sample size, given the high level of performance at baseline it is unlikely that improvement would be demonstrated with a larger sample. The slight decline observed for some autobiographical memory measures may be due to participants being requested to think of a different memory following the intervention; they may have selected an autobiographical memory that had been less well-rehearsed prior to the project, or was less vivid than the memory they discussed at baseline. Future research may determine if there are other means through which interventions may better help to increase autobiographical memory in older adults. A greater use of multimedia resources, or integrating reminiscence with other memory interventions (e.g. those usually more focused on short-term memory and learning) may lead to an enhanced effect on autobiographical memory. Ongoing intervention with long-term follow-up may help to determine if there are preventative effects of reminiscence in healthy older adults at risk of mild cognitive impairment or dementia. Although we employed simple reminiscence, more targeted reminiscence interventions may have more specific effects; for example, instrumental reminiscence focused on past experiences of coping has been shown to have a positive effect on resilience and coping strategies (Meléndez, Fortuna, Sales, & Mayordomo, 2015). However, we did not attempt to focus on a specific function of reminiscence in the current project, as we were interested in observing which functions of reminiscence would emerge in the group context. Given that there are different functions of reminiscence (e.g. Cappeliez et al., Reminiscence and Autobiographical Memory 326 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 https://www.psychopen.eu/ 2005), it would be of interest to see how older adults use discursive practises in reminiscing to acheive different aims. In conclusion, the current results are consistent with previous findings that a reminiscence intervention does not lead to enhanced autobiographical memory performance in healthy older adults (de Medeiros et al., 2011). Further research is required to ascertain the best means by which to preserve episodic memory in healthy ageing. We should also note that, even in the absence of individual psychological effects, participating in group reminiscence allows for healthy older adults to engage in an activity which may benefit themselves and those around them in other ways, such as preservation of oral history (e.g. Bornat, 1989). Competing Interests The authors have declared that no competing interests exist. Funding The research described in this manuscript was supported by a New Horizons grant from the Irish Research Council (REF: REPRO BU 2050158). Acknowledgments The authors would like to acknowledge the organisations that facilitated the reminiscence groups. Ethics Approval This research received ethical approval from the Maynooth University research ethics committees. All participants provided informed consent before beginning their participation in the project. Data Availability Data for this article is freely available (see the Supplementary Materials section). Supp lem ent ar y M ate ri als The following Supplementary Materials are available: 1. The methods and primary outcome measures of this study were pre-registered at Open Science Framework and are available via https://osf.io/9zd5u/. 2. Reminiscence sessions were recorded, and, with participants’ permission, highlights from the reminiscence groups were added to an online archive at the Digital Repository of Ireland and are available via https://repository.dri.ie/catalog/wp98p078n. Participants were encouraged to listen to previous entries in the archive, to help trigger memories of their own. Index of Supplementary Materials Allen, A. P., Doyle, C., & Roche, R. A. P. (2020). Supplementary materials to: The Impact of Reminiscence on Autobiographical Memory, Cognition and Psychological Well-Being in Healthy Older Adults [Methods and data]. OSF. https://osf.io/9zd5u/ Allen, Doyle, & Roche 327 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 https://osf.io/9zd5u/ https://repository.dri.ie/catalog/wp98p078n https://osf.io/9zd5u/ https://www.psychopen.eu/ Allen, A. P., Doyle, C., & Roche, R. A. P. (2020). Supplementary materials to: The Impact of Reminiscence on Autobiographical Memory, Cognition and Psychological Well-Being in Healthy Older Adults [Highlights of reminiscence sessions]. Digital Repository of Ireland. https://repository.dri.ie/catalog/wp98p078n Re fe re nce s Allen, A. P., Doyle, C., Commins, S., & Roche, R. A. P. (2018). Autobiographical memory, the ageing brain and mechanisms of psychological interventions. Ageing Research Reviews, 42, 100-111. https://doi.org/10.1016/j.arr.2017.12.003 Balota, D. A., Tse, C. S., Hutchison, K. A., Spieler, D. H., Duchek, J. M., & Morris, J. C. (2010). 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He previously worked as postdoctoral researcher at the Department of Psychiatry and Neurobehavioural Science and APC Microbiome Ireland in University College Cork, and completed his PhD at Cardiff University. He blogs at http:// andrewspsychologyarchive.blogspot.com/. He is a Senior Editor at Europe’s Journal of Psychology. Caoilainn Doyle completed the work described in this manuscript at Maynooth University. She has conducted postdoctoral research at the University of California, San Francisco. She completed her PhD at Dublin City University, and has previously published in the area of executive function and dyslexia. Richard A. P. Roche is Associate Professor at the Department of Psychology, Maynooth University, following undergradu- ate, postgraduate and postdoctoral study at Trinity College, Dublin. His areas of interest are neuroscience/neuropsychology, particularly memory, ageing, dementia, stroke, brain injury and synaesthesia. He has published 34 research articles, over 90 conference posters, several book chapters and two books. He has to date accrued over €1.25 million in research funding, and has graduated 9 PhD students and 2 MSc students. He has served as President of Neuroscience Ireland and was Founding President of the Irish Brain Council. He is also strongly committed to science outreach and public engagement, and has given an Ignite talk at Science Gallery’s Mindfields at Electric Picnic 2016, performed for BrightClub Dublin in 2017, as well as hosting ‘The Brain Box’, a 2-part radio documentary about the brain on NewsTalk 106-108FM. Reminiscence and Autobiographical Memory 330 Europe's Journal of Psychology 2020, Vol. 16(2), 317–330 https://doi.org/10.5964/ejop.v16i2.2097 PsychOpen GOLD is a publishing service by Leibniz Institute for Psychology Information (ZPID), Trier, Germany. www.leibniz-psychology.org https://doi.org/10.1037%2Fa0030146 https://doi.org/10.1080%2F09658210601119762 https://doi.org/10.1002%2Fgps.1248 https://doi.org/10.1037%2F0022-3514.54.6.1063 https://doi.org/10.1037%2F0033-2909.121.3.331 https://doi.org/10.1371%2Fjournal.pone.0152843 http://andrewspsychologyarchive.blogspot.com/ http://andrewspsychologyarchive.blogspot.com/ https://www.leibniz-psychology.org/ https://www.psychopen.eu/ Reminiscence and Autobiographical Memory (Introduction) Method Design Materials Participants Interventions Procedure Statistical Analysis Results Autobiographical Memory Cognition Psychological Well-Being Discussion (Additional Information) Competing Interests Funding Acknowledgments Ethics Approval Data Availability Supplementary Materials References About the Authors