Fig 1. The incentive value assay of a single-sensory stimulus.

(A) The time spent in incentive zone and (B) the preference score in the 10-minute sexual incentive motivation test, in which male rats where presented with a single-sensory stimulus of one modality and a control male rat (social stimulus). As control situation an empty incentive cage or a receptive female were presented next to the male rat. A = audition, O = olfaction, V = vision, X = ‘others’. *p<0.05 compared to 0.5 (B) or male rat (A), ^ap<0.05 compared to ‘empty’ (A, B), ^bp<0.05 compared to ‘female’ (A, B).