Arousal increment and degree of complexity as incentive.
D000339:Affect; D001143:Arousal; D001244:Association; D003216:Conditioning, Operant; D003220:Conflict, Psychological; D003344:Cortical Synchronization; D004569:Electroencephalography; D005260:Female; D005556:Form Perception; D005712:Galvanic Skin Response; D006801:Humans; D008297:Male; D009042:Motivation; D009622:Noise; D014705:Verbal Behavior