title: Crowding and litter effects on retention and reversal learning by young rats.
mesh_terms: D000818:Animals; D003441:Crowding; D004193:Discrimination Learning; D005260:Female; D008098:Litter Size; D008297:Male; D008568:Memory; D011247:Pregnancy; D051381:Rats; D011919:Rats, Inbred Strains; D012153:Retention, Psychology; D012193:Reversal Learning