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Figure 1 Mean seconds spent in the CS zone during the 30 s CS periods for groups L, T-C, T-NoC and UP during acquisition and extinction in Experiment | (sexual conditioning). The CS was a light for group L and a terrycloth object for groups T-C, T-NoC and UP. Subjects in group T-C copulated with the terrycloth CS, whereas those in groups L and T-NoC did not show conditioned copulatory behavior. F. Koksal et al. / Behaviour Research and Therapy 42 (2004) 1421-1434