Hallucinations and Strong Priors.

Area of Science:

• Cognitive Neuroscience
• Psychology of Perception

Background:

• Hallucinations demonstrate perception's constructive nature.
• Prior beliefs are identified as key triggers for hallucinations.

Purpose of the Study:

• To investigate the role of prior beliefs in hallucination generation.
• To reconcile findings of strong priors in healthy subjects with weak priors in psychosis.

Main Methods:

• Review of empirical work on prior precision and hallucination.
• Analysis of data from neural networks, human behavior, and neuroimaging.
• Theoretical consideration of hierarchical inference models.

Main Results:

• Strong, precise priors can induce hallucinations in healthy individuals.
• Individuals with real-world hallucinations are more susceptible to lab-induced phenomena.
• Hierarchical inference models can explain apparent contradictions in prior precision.

Conclusions:

• Perception is a constructive process heavily influenced by prior beliefs.
• A continuum exists between normal and aberrant perception.
• This framework promotes a more empathetic understanding of clinical hallucinations.