Parsing the Late Positive Complex: Mental Chronometry and the ERP Components that Inhabit the Neighborhood of the P300

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Event‐related potentials, P300, Novelty P3, PCA, Information processing

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Falkenstein, Hohnsbein, and Hoorman (1994) suggested that common measures of P300 latency confound a “P‐SR” component whose latency corresponds to stimulus evaluation time and a “P‐CR” component whose latency varies with response‐selection time, thus casting doubt on work in mental chronometry that relies on P300 latency. We report here a replication and extension of Falkenstein et al. (1994) using a high‐density 129‐electrode montage with 11 subjects. Spatiotemporal PCA was used to extract the components of the ERP. A centroid measure is also introduced for detecting waveform‐timing changes beyond just peak latency. In terms of componentry, we argue that the P‐SR and the P‐CR, correspond to the P3a/Novelty P3 and the P300, respectively. Conceptually, we dispute the proposed distinction between stimulus evaluation and response selection. We suggest a four‐stage ERP model of information processing and place the P3a and the P300 in this framework.

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Citation / Publisher Attribution

Psychophysiology, v. 41, issue 5, p. 665-678