In the first stage of our pilot test, each of the 119 pictures was randomly presented to the participants for 5,000ms, with a 4,000 ms
interstimulus interval, using E-prime software.
The
interstimulus intervals (ISI) were randomized between 1250 and 2500 msec.
Each tone was presented for 300 ms, with an
interstimulus interval of 50 ms.
The indexes were: Omissions, Variability, Hit Reaction Time
Interstimulus Interval (Hit RTISI), Hit Reaction Time (Hit RT), and Hit Reaction Time Block Change (Hit RT BC).
Cadwell TCS-1 double train stimulator (pulse with 50 ms, 2 trains of a total of 9 pulses, 1.7 ms
interstimulus, interval 13.1 ms intertrain interval), constant voltage ranged from 100 to 1000 v was used for stimulation.
for each stimulus, an
interstimulus interval of 1 s.
Each trial began with a center fixation cross on the screen for 500 ms, followed by the picture stimulus in that location for 500 ms, and followed by a 2000 ms
interstimulus interval.
Each block consisted of null trials with background 65 dB noise only, startle only trials consisting of the pulse (120 dB) alone, and prepulse trials of 72, 80, or 84 dB preceding a 120 dB pulse (fixed
interstimulus interval (ISI) = 100 ms).
Each stimulus was followed by an
interstimulus interval (ISI) that varied randomly in duration from 2000 to 3000 ms for subject response and rest.