The six panels depict conditioned response (CR) frequency (Percent CRs), onset latency (ms), criterion latency (ms), peak latency (ms), amplitude (mm) and area (arbitrary units) across six sessions of conditioned stimulus-unconditioned stimulus pairings. The inset for each panel shows the frequency distribution for the conditioned response measure during the sixth session of conditioned stimulus-unconditioned stimulus pairings. The conditioned stimulus was a 400-ms, 1-kHz, 82-dB tone paired with a 100-ms, 2.0-mA periorbital electrodermal unconditioned stimulus (300-ms inter-stimulus interval).