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Neuroscientists uncover a universal mechanism for human decision making
PsyPost • • health
Key Points:
- A new study reveals that the brain uses the same evidence accumulation process for both basic sensory input and newly learned, arbitrary decision rules, as shown by a specific brain wave called centro-parietal positivity (CPP).
- Researchers trained participants to categorize visual stimuli based on hidden angle boundaries and found that the speed of evidence accumulation and CPP buildup increased as stimuli moved further from the learned category boundary.
- The study demonstrated a strong correlation between behavioral sensitivity to the categories and the neural signals, indicating a unified and flexible brain mechanism for accumulating both physical and abstract evidence.
- Control analyses confirmed that the CPP reflects cognitive decision-making rather than motor preparation, as motor cortex activity did not vary with task difficulty.
- Limitations include potential overlap of early visual processing with decision signals and the use of simplified, absolute category boundaries, suggesting future research is needed to explore more complex, real-world categorization scenarios.
