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Grand average difference waves in the psychological decrement condition.

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posted on 15.10.2013, 03:35 by Margaret Macdonald, Kenneth Campbell

Difference waves were created by subtracting frequently occurring 80–80 dB SPL standard pairs in the oddball increment condition (80–80…80–80…80–90…80–80) from deviant occurrences of these pairs in the psychological decrement condition (80–90…80–90…80–80…80–90). Again, the onset of the second (deviant) member of the pair is set at 0 ms in this figure. The psychological decrement elicited a smaller and relatively delayed (peaking between 200–250 ms) but significant MMN. The small inversion of the mastoids was not significant. No P3a-like positivity was present.

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