Exploring the links between functional activation and hallucination proneness.

Area of Science:

• Neuroscience
• Cognitive Psychology

Background:

• Hallucinations are linked to altered brain activation, particularly in sensory and language areas.
• Current models of hallucination proneness lack robust empirical support, necessitating further investigation into neural correlates.

Purpose of the Study:

• To investigate the neural basis of hallucination proneness in healthy individuals using functional MRI (fMRI).
• To examine the relationship between hallucination proneness scores and brain activation during auditory and visual processing tasks.

Main Methods:

• Healthy university students underwent fMRI scans while performing auditory and visual tasks.
• Participants completed the Launay-Slade Hallucination Scale-Modified (LSHS-M) to assess hallucination proneness.
• Correlations between LSHS scores and brain activation in task-relevant and irrelevant regions were analyzed.

Main Results:

• No significant correlation was found between hallucination scores and activation in task-relevant brain regions.
• Positive correlations were observed in language-related regions during visual tasks, indicating greater engagement in task-irrelevant areas.
• Lateralization indices did not correlate with hallucination scores, challenging the continuum hypothesis in non-clinical samples.

Conclusions:

• Findings suggest an inhibition deficit in individuals with higher hallucination proneness, supporting reduced cognitive control theories.
• The study highlights the complex neural mechanisms underlying hallucination proneness and the need for further research with sensitive tasks and diverse populations.