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A Neural Signature Encoding Decisions under Perceptual Ambiguity
Sai Sun1, Rongjun Yu1,2, Shuo Wang3
1School of Psychology, Center for Studies of Psychological Application, and Key Laboratory of Mental Health and Cognitive Science of Guangdong Province, South China Normal University, Guangzhou, 510631, People's Republic of China.
Eneuro
|November 28, 2017
Summary
The brain uses a common neural signal, the late positive potential (LPP), to process ambiguous information from both stimuli and tasks. This signal is linked to decision-making speed and confidence.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Decision Science
Background:
- Perceptual decisions are often made with incomplete or ambiguous information.
- The neural mechanisms underlying the processing of various forms of perceptual ambiguity are not fully understood.
Purpose of the Study:
- To investigate the neural basis of both stimulus-driven and task-driven perceptual ambiguity.
- To identify a common neural substrate for encoding perceptual ambiguity.
Main Methods:
- Utilized three types of perceptually ambiguous stimuli and task instructions.
- Employed electroencephalography (EEG) to record the late positive potential (LPP).
- Used regression models to analyze the relationship between LPP, behavioral responses, and ambiguity ratings.
Main Results:
- Identified the LPP as a neural signature encoding stimulus-driven perceptual ambiguity.
- Found that the LPP was modulated by task ambiguity.
- The LPP correlated with response latency and confidence ratings, indicating its role in decision-making under ambiguity.
Conclusions:
- Evidence suggests a common neural signature (LPP) for decisions under perceptual ambiguity.
- This neural signature is influenced by both stimulus and task ambiguity.
- Findings advance the understanding of neural processes in human perceptual decision-making.
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