Time of Day, Repeated Testing, and Interblock Interval Effects on P300 Amplitude
Document Type
Article
Publication Date
4-1-1990
Department
Psychology
Abstract
Time of day, repeated testing, and interblock interval effects on P300 amplitude were investigated. Subjects (N=50) were tested using a standard oddball paradigm in either morning or afternoon sessions consisting of six test blocks per session. Amplitude of P300 was significantly higher in the morning than in the afternoon for all test blocks. In addition, amplitude of P300 habituated across test blocks from a mean of 9.59 μV on Block 1 to a mean of 4.98 μV on Block 6. Inserting a one-hour interval between Blocks 2 and 3 attenuated the rate of habituation. The results indicate that time of day, repeated testing, and interblock intervals affect P300 amplitude. Amplitude changes due to time of day may reflect circadian variations in cognitive resources indexed by the P300 component, while decrements due to repeated testing may reflect changes in allocation of resources across test sessions.
Publication Title
Physiology and Behavior
Volume
47
Issue
4
First Page
653
Last Page
658
Recommended Citation
Wesensten, N. J.,
Badia, P.,
Harsh, J. R.
(1990). Time of Day, Repeated Testing, and Interblock Interval Effects on P300 Amplitude. Physiology and Behavior, 47(4), 653-658.
Available at: https://aquila.usm.edu/fac_pubs/7372