Hypnosis and its effects on left and right hemisphere activity

Area of Science:

• Neuroscience
• Psychology

Background:

• Research indicates a link between hypnosis and the right cerebral hemisphere.
• Previous studies explored hemispheric shifts during hypnotic states.

Purpose of the Study:

• To investigate if hypnosis shifts auditory processing towards the left ear, indicating right hemisphere activation.
• To examine this effect across varying levels of hypnosis susceptibility and different stimulus types (music vs. verbal).

Main Methods:

• Two studies were conducted with 36 right-handed male volunteers, categorized by low, medium, and high hypnosis susceptibility.
• Study 1 used musical stimuli; Study 2 used verbal stimuli, measuring ear accuracy during hypnosis.

Main Results:

• Study 1 revealed a positive correlation: higher hypnosis susceptibility led to greater left ear accuracy for musical stimuli.
• Study 2 found no significant relationship between hypnosis susceptibility and ear accuracy for verbal stimuli.

Conclusions:

• Hypnosis may selectively enhance right hemisphere engagement, particularly for processing auditory musical information.
• Differences in stimulus characteristics could explain the varied results between musical and verbal processing studies.