Vigor by Reza Shadmehr

Author:Reza Shadmehr
Language: eng
Format: epub
Tags: utility; reward; effort; subjective value; dopamine; serotonin; Parkinson’s disease; walking; reaching; saccades; superior colliculus; frontal eye field; optimal foraging; impulsivity; patience; urgency
Publisher: MIT Press

The decision variable x indicates the merits of moving. It integrates the evidence for and against moving:

The decision to move is made when x(t) reaches threshold x*. (This formulation can also be used in the urgency model, in which case the decision variable rises as a consequence of the difference between the instantaneous evidence, multiplied by a rising urgency signal.) Reaction time is specified by the following ratio:

If we set r = r1 − ro, then t = x*/r. Because r1 and ro are normally distributed independent variables with mean and , the probability density of r is as follows:

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