id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cord-269716-x3b0qphd	Hopper, Lydia M.	Problem solving flexibility across early development	2020-08-26		.txt	text/plain	10333	340	51	Although 2-year-olds struggle with more cognitively demanding physical adaptation of these looking-time studies, by 3 years of age children are able to track a falling object behind an occluder, correctly select a door to open, and reach for the fallen object (Berthier, DeBlois, Poirier, Novak, & Clifton, 2000) . To determine the diversity of action sequences children used, we calculated the diversity index of their responses (Shannon & Weaver, 1949) .	cache/cord-269716-x3b0qphd.txt	txt/cord-269716-x3b0qphd.txt
