Cognitive and neural processes in non-clinical auditory hallucinations

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• The classification of auditory hallucinations in individuals without a clinical diagnosis remains uncertain.
• Understanding the neural underpinnings of these experiences in the general population is crucial.

Purpose of the Study:

• To explore the functional neural basis of non-clinical auditory hallucinations.
• Investigate brain activation patterns associated with hallucination proneness.

Main Methods:

• 68 participants with varying hallucination proneness were selected from a larger sample.
• A signal detection task with degraded stimuli was used to elicit verbal hallucinations.
• Functional magnetic resonance imaging (fMRI) was employed on a subset of participants experiencing hallucinations.

Main Results:

• Individuals with high hallucination proneness reported significantly more false alarms (hearing voices when none were present).
• fMRI revealed significant activation in the superior and middle temporal cortex during these false alarm events.

Conclusions:

• Auditory hallucinatory experiences in non-clinical samples are associated with specific patterns of brain activation.
• These neural patterns appear similar to those observed in individuals with schizophrenia experiencing hallucinations.