Bibliographic Details
| Title: |
Robotically-induced auditory-verbal hallucinations: combining self-monitoring and strong perceptual priors. |
| Authors: |
Orepic, Pavo1, Bernasconi, Fosco1, Faggella, Melissa1, Faivre, Nathan2, Blanke, Olaf1,3 olaf.blanke@epfl.ch |
| Source: |
Psychological Medicine. Feb2024, Vol. 54 Issue 3, p569-581. 13p. |
| Subject Terms: |
*WORD deafness, *DELUSIONS, *PSYCHOLOGICAL distress, *SELF-control, *EMOTIONS, *HALLUCINATIONS, *ROBOTICS, *MATHEMATICAL models, *PSYCHOSES, *SPEECH perception, *THEORY, *HUMAN voice |
| Abstract: |
Background: Inducing hallucinations under controlled experimental conditions in non-hallucinating individuals represents a novel research avenue oriented toward understanding complex hallucinatory phenomena, avoiding confounds observed in patients. Auditory-verbal hallucinations (AVH) are one of the most common and distressing psychotic symptoms, whose etiology remains largely unknown. Two prominent accounts portray AVH either as a deficit in auditory-verbal self-monitoring, or as a result of overly strong perceptual priors. Methods: In order to test both theoretical models and evaluate their potential integration, we developed a robotic procedure able to induce self-monitoring perturbations (consisting of sensorimotor conflicts between poking movements and corresponding tactile feedback) and a perceptual prior associated with otherness sensations (i.e. feeling the presence of a non-existing another person). Results: Here, in two independent studies, we show that this robotic procedure led to AVH-like phenomena in healthy individuals, quantified as an increase in false alarm rate in a voice detection task. Robotically-induced AVH-like sensations were further associated with delusional ideation and to both AVH accounts. Specifically, a condition with stronger sensorimotor conflicts induced more AVH-like sensations (self-monitoring), while, in the otherness-related experimental condition, there were more AVH-like sensations when participants were detecting other-voice stimuli, compared to detecting self-voice stimuli (strong-priors). Conclusions: By demonstrating an experimental procedure able to induce AVH-like sensations in non-hallucinating individuals, we shed new light on AVH phenomenology, thereby integrating self-monitoring and strong-priors accounts. [ABSTRACT FROM AUTHOR] |
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