The scalp topography of potentials in auditory and visual Go/NoGo tasks

The Event-Related Brain Potential as an Index of Information Processing and Cognitive Activity: A Program of Basic Research.

“…On no-go trials, compared with go trials, Cz became much more positive, while Pz remained constant (and Cz thus became 113 equal to Pz). In a go/no-go experiment in progress with 47 of the subjects 4 used in the reliability study described above, we found results similar to Simson et al (1977b). Fz and Pz remained cor.otant across all trials, but there was a dramatic increase in P300 at Cz during no-go trials.…”

“…Hillyard et al (1976) found that P300 on the no-go trials, compared to the go trials, became smaller at Pz and larger at Fz. Simson et al (1977b), on the other hand, found that most change in amplitude occurred at Cz. On no-go trials, compared with go trials, Cz became much more positive, while Pz remained constant (and Cz thus became 113 equal to Pz).…”

“…When an array of electrodes is used, isopotential maps can be created by interpolating between electrodes at one time point (e.g., Simson, Vaughan, & Ritter, 1976;Simson, Vaughan, & Ritter, 1977a, 1977b; or, one can map changing contours over time using equipotential lines (spatio-temporal mapping, "chronotopogram"; Remond, 1961). This technique presents much more information than ratios of the voltage recorded at Cz to other electrode sites.…”

“…An explanation centering around differences in motor potentials between go and no-go trials is not without problems. In our study subjects were instructed to respond as quickly as possible after S2, while Simson et al (1977b) required a delayed motor response. They suggest that the "nogo P3 presents a central extension that could represent a contribution from CNV resolution" (p. 871).…”

The NoGo P300 ‘anteriorization’ effect and response inhibition

“…Fallgatter et al, 1999;Tekok-Kilic et al, 2001). For auditory stimuli, Simson et al (1977) reported P300s elicited in an S1-S2 CNV-type task with equiprobable Go and NoGo tones. Regardless of stimulus modality, one effect on P300 has been consistently reported across tasks.…”