Slow brain potentials in a visual-spatial memory task: topographic distribution and inter-laboratory consistency.
- Authors
- Rohrbaugh, J W; Dunham, D N; Stewart, P A; Bauer, L O; Kuperman, S; O'Connor, S J; Porjesz, B; Begleiter, H
- Year
- 1997
- Journal
- International journal of psychophysiology : official journal of the International Organization of Psychophysiology
- PMID
- 9101336
- DOI
- 10.1016/s0167-8760(96)00714-3
Slow brain electrical potentials (SPs) were investigated in a visual-spatialmemory task. Two issues were addressed: (1) the nature and topographic distribution of the potentials obtained under such conditions; and (2) the consistency of the SPs when recorded in six identically configured laboratories. Fifteen young male subjects were studied at each laboratory (total n = 90). The paradigm entailed presentations of paired-visual patterns (S1 and S2), to which subjects responded with a choice reaction time response indicating whether or not the two patterns matched. A biphasic contingent negative variation (CNV) was produced which consisted of an early symmetric component with bilateral foci at posterior temporal sites and a subsequent mid-parietal dominant wave later in the retention interval. Although the CNVs from all laboratories were similar in waveform and in topographic distribution, there were significant inter-laboratory differences in amplitude of the slow potential components. The topographic distributions of the components and the possible role of sampling effects are discussed.
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