This research was supported by the Deutsche Forschungsgemeinschaft (Ro 805).
The impact of performance uncertainty on the postimperative negative variation
Version of Record online: 30 JAN 2007
Volume 33, Issue 4, pages 426–433, July 1996
How to Cite
KLEIN, C., ROCKSTROH, B., COHEN, R., BERG, P. and DRESSEL, M. (1996), The impact of performance uncertainty on the postimperative negative variation. Psychophysiology, 33: 426–433. doi: 10.1111/j.1469-8986.1996.tb01068.x
We thank Drs. Watzl, Haslacher, and Pröpster for performing the Brief Psychiatric Rating Scale.
- Issue online: 30 JAN 2007
- Version of Record online: 30 JAN 2007
- (Received October 24, 1994; Accepted August 14, 1995)
- Slow cortical potentials;
- Contingent negative variation;
- Postimperative negative variation;
In a delayed matching-to-sample task, the impact of clear or ambiguous go versus clear no-go signals on the post-imperative negative variation (PINV) was examined in 11 patients with a chronic schizophrenic disorder (DSM-III-R) and in a control group of 13 healthy subjects matched to the patient sample by age, sex, and education. Size and spatial position of a visual S2 had to be matched to one of two visual patterns in the S1 presented 4 s earlier. In 96 trials, the S2 was identical in size with one of the two patterns of S1 (clear matching). These trials varied pseudorandomly, with 60 trials in which the S2 was of intermediate size. On a randomly interspersed additional 48 trials, an S2 differing in color and shape signaled no-go. The electroencephalogram was recorded from Fz, Cz, Pz, F3, F4, C3, C4, P3, and P4. Although groups did not differ in contingent negative variation amplitude the PINV was generally more pronounced in patients than in controls. In both groups, ambiguity of the to-be-matched S2 produced larger PINV amplitudes; the no-go signal elicited only a small PINV. Differential effects of ambiguity and no-go on PINV amplitude and its scalp distribution suggest that “performance” and “action” uncertainty contribute to PINV generation and that thresholds for both effects are reduced in schizophrenics.