Mr. Nordby's present address is Department of Somatic Psychology, Årstadveien 21, 5000 Bergen, Norway.
Event-Related Potentials to Breaks in Sequences of Alternating Pitches or Interstimulus Intervals
Article first published online: 30 JAN 2007
Volume 25, Issue 3, pages 262–268, May 1988
How to Cite
Nordby, H., Roth, W. T. and Pfefferbaum, A. (1988), Event-Related Potentials to Breaks in Sequences of Alternating Pitches or Interstimulus Intervals. Psychophysiology, 25: 262–268. doi: 10.1111/j.1469-8986.1988.tb01239.x
This study was supported in part by the Medical Research Service of the Veterans Administration. NIMH grant MH 40052, and NIMH Special Research Center grant MH 30854.
- Issue published online: 30 JAN 2007
- Article first published online: 30 JAN 2007
- (Manuscript received March 2, 1987; accepted for publication November 2, 1987)
- Event-related brain potentials;
- Tone pattern;
- Rhythm pattern;
- Mismatch negativity;
Fourteen subjects were run in paradigms designed to explore event-related brain potentials (ERPs) elicited by breaks in alternations in pitch or interstimulus interval. In the Pitch paradigm, tones of 500 Hz or 1000 Hz were presented in alternation at regular interstimulus intervals of 800 ms. In the Rhythm paradigm, a single tone, either 500 Hz or 1000 Hz, was presented at interstimulus intervals alternating between 400 ms and 800 ms. Breaks in the Pitch paradigm consisted of a single repetition of a pitch, and in the Rhythm paradigm of a single repetition of the 400-ms interstimulus interval. Breaks occurred with a 10% probability in both cases. Subjects read while stimuli were being presented.
A N210 wave of about 3.5 μV was elicited by breaks in pitch pattern but not by breaks in rhythm. That it was largest (most negative) frontally suggests that it was a type of mismatch negativity. Analysis of waveforms constructed by subtracting ERPs to standards from ERPs to breaks confirmed these results. Thus we conclude that the system triggering mismatch negativity can encode the temporal ordering of pitches.