Speed-accuracy tradeoff turns up gain in the brain

Speed-accuracy tradeoff turns up gain in the brain
a) random dot motion task: after a fixation cross and a period of random motion, coherent motion (here: upward, coherence1092 70%) is displayed for 2000 ms or until response (the same task was used in the EEG experiment); b) response setup in TMS experiment: Participants held one button (up) between their thumb and index finger (pinch) and one in the palm of their hand (down), attached to a cylinder (grasp) Credit: Spieser et al., eNeuro (2018)

Widespread changes in neural activity enable people to quickly make a decision by "turning up the gain in the brain," suggests a human study published in eNeuro. The findings help to resolve a central issue in our understanding of decision-making.

The ability to optimize the balance between careful and hasty is critical for survival. However, a compelling explanation for how the brain strikes such a balance, known as speed-accuracy tradeoff (SAT), is lacking.

Carmen Kohl and colleagues reconcile contradictory accounts of the SAT by providing evidence for a model of speeded decision-making that explains both behavioral and neural data. For this study, human participants indicated the direction of moving dots on a screen either as fast or as accurately as possible using a "pinch" or "grasp" response while their brain and muscle activity was recorded.

The researchers found that their results were best explained by a model in which the brain adjusts the of in order to tailor the balance between speed and accuracy to the decision-making context.


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More information: Neurodynamic Evidence Supports a Forced-Excursion Model of Decision-Making under Speed/Accuracy Instructions, eNeuro, DOI: 10.1523/ENEURO.0159-18.2018
Citation: Speed-accuracy tradeoff turns up gain in the brain (2018, June 4) retrieved 8 December 2019 from https://medicalxpress.com/news/2018-06-speed-accuracy-tradeoff-gain-brain.html
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