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Top-Down Regulation of Left Temporal Cortex by Hypnotic Amusia for Rhythm: A Pilot Study on Mismatch Negativity

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Top-Down Regulation of Left Temporal Cortex by Hypnotic Amusia for Rhythm: A Pilot Study on Mismatch Negativity INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL HYPNOSIS Facco, E., Ermani, M., Rampazzo, P., Tikhonoff, V., Saladini, M., Zanette, G., Casiglia, E., Spiegel, D. 2014; 62 (2): 129–44

Abstract

To evaluate the effect of hypnotically induced amusia for rhythm (a condition in which individuals are unable to recognize melodies or rhythms) on mismatch negativity (MMN), 5 highly (HH) and 5 poorly (LH) hypnotizable nonmusician volunteers underwent MMN recording before and during a hypnotic suggestion for amusia. MMN amplitude was recorded using a 19-channel montage and then processed using the low-resolution electromagnetic tomography (LORETA) to localize its sources. MMN amplitude was significantly decreased during hypnotic amusia (p < .04) only in HH, where the LORETA maps of MMN showed a decreased source amplitude in the left temporal lobe, suggesting a hypnotic top-down regulation of activity of these areas and that these changes can be assessed by neurophysiological investigations.

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