Visual 'cognitive' evoked potentials in the behaving monkey

A. Glover, M. F. Ghilardi, I. Bodis-Wollner, M. Onofrj, L. H. Mylin

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Using a visual 'oddball' paradigm we studied ERPs in monkeys trained in a 'go' 'no-go' discrimination task. The stimuli were 2.5 cpd sinusoidal gratings differing only in orientation (0° or 25°). Monkeys released a lever during 1 of 2 response windows (RW), 480-1762 or 740-1672 msec, following target stimulus onset. Target stimulus presentation probabilities were 1.0, 0.5 and 0.3. The primary evoked potentials recorded to either the target or non-target stimulus were similar in all monkeys. P3 signals progressively emerged in the monkeys only to the target stimulus. P3 recorded at Cz, P3, and P4 had similar mean latencies and amplitudes. Eye movements showed no relationship to P3 potentials. Neither the primary visual potentials nor P3 changed significantly as a function of RW. P3 amplitude was inversely related to target probability. When the target stimulus was presented 100% of the time (P = 1.0) P3 disappeared over 4-5 blocks of trials, while the primary evoked potentials remained consistent.

Original languageEnglish
Pages (from-to)65-72
Number of pages8
JournalElectroencephalography and Clinical Neurophysiology/ Evoked Potentials
Volume80
Issue number1
DOIs
StatePublished - 1991

Keywords

  • Event-related potentials
  • Monkey P300
  • Visual P300

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