Table 1.

Environmental/Learning Manipulations Summary: Effects on Sucrose-Directed Behaviors (operant)

Citation	EE manipulation	Effects
Stairs et al., (2006)	Rats reared in EE	EE resulted in faster extinction of responding previously reinforced with sucrose
Grimm et al., (2008)	Rats reared in EE	EE increased non-reinforced responding during training in late adolescence; no effect on subsequent sucrose seeking
Grimm et al., (2008)	29 day EE as intervention post-training	EE decreased sucrose cue-reactivity and attenuated incubation of sucrose craving
Green et al., (2010)	Rats reared in EE	EE decreased sucrose self-administration
Gill and Cain, (2011)	Rats reared in EE	EE decreased acquisition of sucrose self-administration
Grimm et al., (2013)	Overnight (acute) or 29 day (chronic) EE as intervention post-training	Parametric evaluation: EE including toys and conspecifics most effective at reducing sucrose seeking; acute EE more effective than chronic EE; EE reduced both sucrose seeking and taking
Grimm et al., (2019)	Overnight (acute) or 29 day (chronic) EE as intervention post-training; testing for 7 days post-EE	Persisting effect on sucrose seeking and taking post-EE: 12 hour reduction within-session; up to 3 days between-session
Yates et al., (2019)	Rats reared in EE	EE increased elasticity of demand for sucrose

Note. Unless otherwise specified, studies tested sucrose seeking and taking by adult, male rats.