Each target was immediately followed by a neutral "mask" of 467 466 msec, to total 500 msec of visual stimuli.
The fatigability of the muscle was determined over a four minute time period using a 200 msec train of stimuli at 30 pps, once every two seconds (Peters and Aulner, 2000).
Field stimulation at a frequency of 1 Hz, a pulse width of 0.5 msec, and stimulus strength 20% above threshold was commenced.
The duration of stimulus was 250 msec.
In selecting 33 msec for target duration, we were guided by the range of stimulus durations in several earlier imaging studies demonstrating effective backward-masking of stimuli with affective valence.
There was then a 500 msec motion stimulus, followed by a delay of 350 550 msec before the monkeys received a cue to respond.
Results from psychophysics suggest that it can take as little as 60 msec, or as long as 500 msec, for a stimulus to reach (or produce) experience, depending on the subject, type of stimulus, sensory modality, and the task the subject is attempting to perform.
ERPs recorded from babies of nonsmokers began to distinguish consonant and vowel sounds within 150 msec after stimulus onset and discriminated among a larger number of different speech syllables.
The following maximum peak components, N1 (20 55 msec), P1 (56 95 msec), N2 (96–145 msec), P2 (146–300 msec), served a priori as dependent variable, as these components have consistently been shown to be related to the processing of stimulus intensity [27], [36] [40].
Interstimulus interval was fixed at 300 msec, stimulus duration 50 msec.
