Relative aversiveness of noise and shock.

Abstract

Relative aversiveness of sound and shock was assessed in a spatial preference situation using 8 levels of white noise (45-115 db. in 10-db. steps) as stardard stimuli. Each standard level was paired with 4 or 5 comparison shock intensities, and proportion of time spent on noise and shock sides of the cage was recorded. Stimuli were defined as equally aversive when best-fitting straight lines indicated equal preference for noise and shock. Aversiveness of shock in volts increased linearly as a function of noise in decibels, and the maximum, usable, nondam-aging level of noise was found to be far less aversive than shock intensities typically used in psychological research.