crane_slides2

These functions describe 1 at bethe process is

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: neuron up to that , p two time points, viewed to: and the underlying in bans, this responses 2|i hesis that density functions. These functions describe 1 at Bethe process| is stopped and a decision is rendered for h . sensory time point, given that h is true. If the weight of evidence reaches the barrier , that “two This is the expected outcome when h is true. If the weight of evidence reaches B (not shown), a decision for h is issued in error. 1 rtex. We (Recall) Equation 4, 1is the logistic function (here using . (4) Pr(h |m) t, that is neither which,speed. Higher barriers meant that 1968; 1 and10 B1975; Luce, 1986; Ratcliff and like le tween accuracy and Link Heath, ght, when more evidence was e ). Unlike in turn, implied Rouder, 1998; Stone, 1960; Usher and McClelland, 2001; base accumulated, which, in Equation 4, however, the probability 1 0 0 1 1 1 1 1 0 Pr(x,y|h1) 994). Thus, neural activity in these areas Banburismus Performed by Neurons ncoded, noisy evidence that the brain Neuron where 304 Speed-Accuracy Tradeoff o decide which hypothesis was most Neuron 304 1 (x ) 1 2 2 (y √1 2 ) 0 2 2 P(Correct) QPredicted Effect of Barrier Height Accuracy y Signals to Turing’s Figure 3. 2 2 1 on Speed, Accuracy, and Reward Rate in a Figure 3. Predicted Effect of Direction-Discrimination Task Barrier Height nce on Speed, Accuracy, and Reward Rate in The calculations assume that an experiment a 2 Direction-Discrimination (see uses six levels ofthe Task text for dedifficulty is assume common variance, 1 and consider categorical decisions about The (A) Accuracy. that an experiment tails). calculations The probability of a coruses six levels of difficulty all text for derect choice averaged across(see six motion x Accuracy. The function of barrier gnals by formulating quantities like Tutails). (A)and y, respectively, under h1, and strengths is plotted as a probability of a correct choice averaged ensures six deciheight. A higher barrieracross all that motion strengthsbased on aas a xweight of evi- . vidence that are m...
View Full Document

This note was uploaded on 09/15/2011 for the course COGS 1 taught by Professor Lewis during the Spring '08 term at UCSD.

Ask a homework question - tutors are online