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Hypnotizability and the Peripersonal Space.

Francesca Diolaiuti1, Tommaso Banfi1, Enrica L Santarcangelo1

  • 1a University of Pisa , Italy.

The International Journal of Clinical and Experimental Hypnosis
|August 25, 2017
PubMed
Summary

Highly hypnotizable individuals show altered perception of personal space, potentially due to brain asymmetry. Their spatial awareness differs significantly from those with low hypnotizability.

Area of Science:

  • Cognitive Neuroscience
  • Psychology

Background:

  • High hypnotizability is linked to left-sided cerebral asymmetry.
  • This asymmetry may affect the measurement of Peripersonal Space (PPS).

Purpose of the Study:

  • To investigate how hypnotizability influences Peripersonal Space (PPS) measurement using the line bisection test.
  • To explore the relationship between cerebral asymmetry, hypnotizability, and spatial perception.

Main Methods:

  • Participants with high, medium, and low hypnotizability scores performed a computer-based line bisection test.
  • The computer screen was automatically displaced at 30, 60, and 90 cm from participants' eyes.
  • Relative Error (RE) and Bisection Times (BT) were measured.

Main Results:

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  • Highly hypnotizable individuals (highs) consistently showed a rightward bias in the line bisection task across all distances.
  • Low hypnotizability individuals (lows) initially showed a leftward bias, shifting rightward with increased distance.
  • Medium hypnotizability individuals (mediums) displayed intermediate results, while highly hypnotizable individuals had longer Bisection Times (BT).

Conclusions:

  • High hypnotizability may lead to Peripersonal Space (PPS) being perceived as extrapersonal.
  • The prolonged Bisection Times (BT) in highly and medium hypnotizable individuals suggest less efficient sensorimotor performance.
  • Cerebral asymmetry associated with high hypnotizability appears to influence spatial perception and Peripersonal Space (PPS) representation.