Figure 2. Representative session using the described experimental design.

The first five trials consist of five pulse-alone trials (A), the intermediate 80 trials are divided into 10 blocks of randomized pulse-alone trials, prepulse-alone trials, combinations of prepulse-pulse trials and no-stimulus trials (B) and the session is concluded with a final block of five consecutive pulse-alone trials (C). Prepulse intensities (73 dB, 76 dB and 82 dB) are above the 70 dB background.