What is the role of affect in the spacing effect?
D000293:Adolescent; D000328:Adult; D000339:Affect; D003071:Cognition; D005260:Female; D006801:Humans; D007600:Judgment; D008297:Male; D008568:Memory; D011939:Mental Recall; D008875:Middle Aged; D012660:Semantics; D013997:Time Factors