Before revision: In 1993, Rosenzweig and colleagues demonstrated that, in rats conditioned with an aversive stimulus, percent avoidance of the stimulus (and, by implication, memory of the aversive nature of the stimulus) reached relative minima at one minute, fifteen minutes, and sixty minutes.
After revision: In 1993, Rosenzweig and colleagues demonstrated that, in chicks conditioned with an aversive stimulus, percent avoidance of the stimulus (and, by implication, memory of the aversive nature of the stimulus) reached relative minima at one minute, fifteen minutes, and sixty minutes.