A physiological investigation of volitional and nonvolitional experience during posthypnotic amnesia

Area of Science:

• Psychology
• Neuroscience
• Cognitive Science

Background:

• Posthypnotic amnesia is a phenomenon where individuals forget information presented during hypnosis.
• Subjects can be classified by their ability to control memory recall (voluntaries vs. involuntaries).
• Understanding the physiological correlates of memory recall under hypnosis is crucial for advancing hypnosis theories.

Purpose of the Study:

• To compare physiological responses of voluntary and involuntary hypnotic subjects during posthypnotic amnesia recall.
• To investigate the effect of pressure (lie detector instructions) versus relaxation on memory recall in hypnotic subjects.
• To examine the relationship between physiological measures and self-reported control over memory during hypnosis.

Main Methods:

• Four physiological measures (heart rate, electrodermal response, respiration rate, muscle tension) were recorded.
• Subjects were exposed to two conditions: lie detector instructions (pressure) and a relax condition (control).
• Recall data and electrodermal responses were analyzed to assess memory breaches and self-reported control.

Main Results:

• Voluntary subjects under lie detector conditions recalled significantly more than other groups.
• Both voluntary and involuntary subjects demonstrated memory breaches under lie detector conditions.
• Electrodermal response data corroborated subjects' self-reports of memory control.

Conclusions:

• The voluntary/involuntary classification may be nuanced, as both groups can breach amnesia under pressure.
• Electrodermal response is a potentially valid physiological indicator of perceived control during hypnotic recall.
• Findings contribute to understanding posthypnotic amnesia, subject classification, and hypnosis theories.