. Author manuscript; available in PMC: 2019 Sep 1.

Published in final edited form as: J Exp Psychol Gen. 2018 Sep;147(9):1349–1381. doi: 10.1037/xge0000462

Table 9.

Effect sizes for Environmental Enrichment/Deprivation: Individual-publication effect sizes.

Study	Population	Manipulation	DV	Effect on Impulsivity		Effect Size
Baarendse et al. (2013)	Rats	3-wk enrichment	%LLR		n.s.	0.10
Botanas et al. (2016) ^§	Rats – SHR	4-wk enrichment	%LLR	↓,	n.s.	0.28^*
Botanas et al. (2016) ^§	Rats – WKY	4-wk enrichment	%LLR	↓,	n.s.	0.35^*
Hellemans et al. (2005)	Rats	12-wk isolation	%LLR	↓,	n.s.	CNC
Hellemans et al. (2005)	Rats	12-wk enrichment	%LLR	↓,	n.s.	CNC
Kirkpatrick et al. (2013)	Rats	5-wk enrichment	%LLR	↓,	n.s.	0.33
Perry et al. (2008)	Rats	5-wk enrichment	MAD	↓		0.67

n.s., No statistically significant effect; CNC, could not calculate effect size

Effect sizes averaged across experiments or comparable conditions.

^§

The effect sizes for the intervention at the 10-s LLR delay are included in the averages presented in the table, but omitted from the meta-analysis (>3 effect sizes in the same subjects).