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Stimulus presentation rate dissociates sequential effects in event‐related potentials and reaction times
Author(s) -
LEUTHOLD HARTMUT,
SOMMER WERNER
Publication year - 1993
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1993.tb02074.x
Subject(s) - psychology , stimulus (psychology) , expectancy theory , event related potential , dissociation (chemistry) , interstimulus interval , electrophysiology , audiology , contingent negative variation , choice reaction time , perception , electroencephalography , cognitive psychology , neuroscience , developmental psychology , cognition , social psychology , chemistry , stimulation , medicine
The present study explored the impact of the stimulus presentation rate on sequential effects in event‐related potentials (ERPs) and reaction times (RTs). Random series of equiprobable tones were presented at interstimulus intervals (ISIs) of 1.3, 2.1, and 2.9s. Fast and accurate choice responses to the tones were required. Although sequential effects in RTs were stable across all ISIs, the common first‐order repetition effect in P300 amplitude was only observed at the 1.3‐s ISI and not at the slower presentation rates. This dissociation between the first‐order effects in RTs and ERPs speaks against an explanation of both effects by a common expectancy mechanism. In addition, sequential effects were observed as early as about 100 ms after stimulus onset in the lateralized readiness potential. Together with similar sequential effects in P300 latency, this finding supports a continuous flow model of information processing.