Humans strategically shift decision bias by flexibly adjusting sensory evidence accumulation
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Humans strategically shift decision bias by flexibly adjusting sensory evidence accumulation. / Kloosterman, Niels A; de Gee, Jan Willem; Werkle-Bergner, Markus; Lindenberger, Ulman; Garrett, Douglas D; Fahrenfort, Johannes Jacobus.
In: ELIFE, Vol. 8, 06.02.2019.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Humans strategically shift decision bias by flexibly adjusting sensory evidence accumulation
AU - Kloosterman, Niels A
AU - de Gee, Jan Willem
AU - Werkle-Bergner, Markus
AU - Lindenberger, Ulman
AU - Garrett, Douglas D
AU - Fahrenfort, Johannes Jacobus
N1 - © 2019, Kloosterman et al.
PY - 2019/2/6
Y1 - 2019/2/6
N2 - Decision bias is traditionally conceptualized as an internal reference against which sensory evidence is compared. Instead, we show that individuals implement decision bias by shifting the rate of sensory evidence accumulation toward a decision bound. Participants performed a target detection task while we recorded EEG. We experimentally manipulated participants' decision criterion for reporting targets using different stimulus-response reward contingencies, inducing either a liberal or a conservative bias. Drift diffusion modeling revealed that a liberal strategy biased sensory evidence accumulation toward target-present choices. Moreover, a liberal bias resulted in stronger midfrontal pre-stimulus 2-6 Hz (theta) power and suppression of pre-stimulus 8-12 Hz (alpha) power in posterior cortex. Alpha suppression in turn was linked to the output activity in visual cortex, as expressed through 59-100 Hz (gamma) power. These findings show that observers can intentionally control cortical excitability to strategically bias evidence accumulation toward the decision bound that maximizes reward.
AB - Decision bias is traditionally conceptualized as an internal reference against which sensory evidence is compared. Instead, we show that individuals implement decision bias by shifting the rate of sensory evidence accumulation toward a decision bound. Participants performed a target detection task while we recorded EEG. We experimentally manipulated participants' decision criterion for reporting targets using different stimulus-response reward contingencies, inducing either a liberal or a conservative bias. Drift diffusion modeling revealed that a liberal strategy biased sensory evidence accumulation toward target-present choices. Moreover, a liberal bias resulted in stronger midfrontal pre-stimulus 2-6 Hz (theta) power and suppression of pre-stimulus 8-12 Hz (alpha) power in posterior cortex. Alpha suppression in turn was linked to the output activity in visual cortex, as expressed through 59-100 Hz (gamma) power. These findings show that observers can intentionally control cortical excitability to strategically bias evidence accumulation toward the decision bound that maximizes reward.
U2 - 10.7554/eLife.37321
DO - 10.7554/eLife.37321
M3 - SCORING: Journal article
C2 - 30724733
VL - 8
JO - ELIFE
JF - ELIFE
SN - 2050-084X
ER -