Evidence accumulation under uncertainty - a neural marker of emerging choice and urgency
| Autor: | Eoin Travers, Elisabeth Parés-Pujolràs, Yoana Ahmetoglu, Patrick Haggard |
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| Rok vydání: | 2020 |
| Předmět: |
Adult
Male Evidence accumulation Visual perception Computer science Cognitive Neuroscience Decision Choice Behavior 050105 experimental psychology lcsh:RC321-571 Task (project management) Competition (economics) 03 medical and health sciences Young Adult 0302 clinical medicine Humans 0501 psychology and cognitive sciences Computer Simulation lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry Categorical variable Basis (linear algebra) 05 social sciences SIGNAL (programming language) Urgency Uncertainty Brain P3 Electroencephalography Event-Related Potentials P300 Neurology Action (philosophy) Action Dynamics (music) Female Single trial Psychology 030217 neurology & neurosurgery Photic Stimulation Psychomotor Performance Cognitive psychology |
| Zdroj: | NeuroImage, Vol 232, Iss, Pp 117863-(2021) |
| ISSN: | 1095-9572 |
| Popis: | To interact meaningfully with its environment, an agent must integrate external information with its own internal states. However, information about the environment is often noisy. In this study, we identify a neural correlate that tracks how asymmetries between competing alternatives evolve over the course of a decision. In our task participants had to monitor a stream of discrete visual stimuli over time and decide whether or not to act, on the basis of either strong or ambiguous evidence. We found that the classic P3 event-related potential evoked by sequential evidence items tracked decision-making processes and predicted participants' categorical choices on a single trial level, both when evidence was strong and when it was ambiguous. The P3 amplitudes in response to evidence supporting the eventually selected option increased over trial time as decisions evolved, being maximally different from the P3 amplitudes evoked by competing evidence at the time of decision. Computational modelling showed that both the neural dynamics and behavioural primacy and recency effects can be explained by a combination of (a) competition between mutually inhibiting accumulators for the two categorical choice outcomes, and (b) a context-dependant urgency signal. In conditions where evidence was presented at a low rate, urgency increased faster than in conditions when evidence was very frequent. We also found that the readiness potential, a classic marker of endogenously initiated actions, was observed preceding movements in all conditions - even when those were strongly driven by external evidence. |
| Databáze: | OpenAIRE |
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