The effect of 21 days paroxetine (3 mg kg−1 day−1, p.o., Par) compared to vehicle treated controls (Veh) on rat behaviour in the high-light social interaction test. A significant increase in interaction time (a) was evident in rats treated with paroxetine, compared to vehicle treated controls, whilst no concurrent change was identified in locomotor activity (b) between the two treatment groups. Results are presented as mean±s.e.mean **P<0.01 from vehicle treated controls, unpaired t-test. n=12 (Veh), n=9 (Par).