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 following changes were made: (a) use a 0-s DMTS procedure and only test one-third of the relations in the training and testing for stimulus equivalence, (b) reduce the size of the visual stimuli, (c) decrease the duration of the stimuli presentations, (d) increase the interstimulus
interval, (e) reduce the number of stimuli presented by removing the baseline relations and by presenting fewer related stimulus pairs, and (f) present unrelated stimulus pairs only once.
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
This is highly likely to be related to an SSVEP artifact derived from a fixed value of the interstimulus
duration (125 ms).
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.
Stimuli appeared for a duration of 117 ms at a different spatial location with an interstimulus
duration of 225-1000 ms .