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The response line motion strength 250 is reasonable

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Unformatted text preview: e performance responsethe coherent the 0% plotted function (Equation (D) Response times the optimal motion of the motion strengths. The response line motion strength 250 is reasonable approximation to at chance (not shown). The a best time cumulative Weibull, each stimulus h aatcertainis probability. time isisdecisionfitting height.Equation 9)fromwhich ms.aonset until behavioral responsethe logistic factors could cau probabiliB Response times usingThesebarrier (from The time plusstimulus Note that numerous function (Equation 8). (D) the optimal is plotted at each of the motion strengths. The response time is decision time (from Equation 9) plus 250 ms. ated bythe average decision time also depends on B that there are three other intervals, each of a fixed durataking repeated measurements of , including intrinsic factors like att Note that of and the particular list(or group of neurons) to non-decision time t onextrinsic factors like the light level a neuron of motion strengths chosen by the tion: the a and each presentation (e.g., fix probabilities. In this case, for a given weight Review ce (e.g., the stopping point in Banburismus): 305 g Experimental Evidence Pr(h1|m) Neurophysiology: Banburismus in the Brain weight of evidence B (3) Pr(and-error, in which the barrier is raised and lowered until h0|m) the maximum rate of reward is achieved. Interestingly, in this case, the constant of proportionality that relates the accumulated difference (x y) to the weight of evidence 1 is not needed to find the barrier height that leads to the maximum rate of reward. That information is not lost, however: once the barrier height is fixed, it corresponds 0 1 to a particular level of overall performance and thus can be expressed in units of the weight of evidence, such as natural bans. Note that this quantity is not the weight of evidence that would be calculated based on knowledge of the stimulus motion strength and the associated sensory response distributions because that information would 1 lead to perfect performance at all motion B strengths. Rather, it is the weight of evidence that corresponds to a fixed level of uncertainty across all stimulus strengths in an experime...
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This note was uploaded on 09/15/2011 for the course COGS 1 taught by Professor Lewis during the Spring '08 term at UCSD.

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