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Elife. 2017 Jan 31;6. pii: e21481. doi: 10.7554/eLife.21481.

Distinct mechanisms mediate speed-accuracy adjustments in cortico-subthalamic networks.

Author information

1
Medical Research Council Brain Network Dynamics Unit at the University of Oxford, Oxford, United Kingdom.
2
Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom.
3
Department of Neurosurgery, King's College Hospital, London, United Kingdom.
4
Unit of Functional Neurosurgery, Sobell Department of Motor Neuroscience and Movement Disorders, University College London Institute of Neurology, London, United Kingdom.

Abstract

Optimal decision-making requires balancing fast but error-prone and more accurate but slower decisions through adjustments of decision thresholds. Here, we demonstrate two distinct correlates of such speed-accuracy adjustments by recording subthalamic nucleus (STN) activity and electroencephalography in 11 Parkinson's disease patients during a perceptual decision-making task; STN low-frequency oscillatory (LFO) activity (2-8 Hz), coupled to activity at prefrontal electrode Fz, and STN beta activity (13-30 Hz) coupled to electrodes C3/C4 close to motor cortex. These two correlates differed not only in their cortical topography and spectral characteristics but also in the relative timing of recruitment and in their precise relationship with decision thresholds. Increases of STN LFO power preceding the response predicted increased thresholds only after accuracy instructions, while cue-induced reductions of STN beta power decreased thresholds irrespective of instructions. These findings indicate that distinct neural mechanisms determine whether a decision will be made in haste or with caution.

KEYWORDS:

decision thresholds; human; neuroscience; speed-accuracy tradeoff; subthalamic nucleus

PMID:
28137358
PMCID:
PMC5287713
DOI:
10.7554/eLife.21481
[Indexed for MEDLINE]
Free PMC Article

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