Effect of i.p. saline or i.p. cocaine (7 mg/kg) on genital reflexes in paradoxical sleep deprived Wistar and SHR rats. Panel A: Percentage of rats displaying genital reflexes and Panel B: Frequency of genital reflex events. *Different from same-strain (saline); #Different from the respective group of Wistar strain. In Panel B, data are expressed as mean ± SEM for N = 10. Abbreviations: PE: penile erection; EJ: ejaculation; W: Wistar; SHR: spontaneously hypertensive rats.