T19_Decision Making

5 10 hulvershorn j elliot ma 0 05 10 eye movement lip

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Unformatted text preview: ssion 142 with previousl Session 11 0.5 1.0 Hulvershorn, J., Elliot, M.A. & 0 0.5 1.0 Eye movement LIP 40 20 10 0 Time (s) What is the neural locus of learning (decrease coherence threshold with training)? LIP cell MT cells Hypothesis 1: The MT cells become more sensitive to dot coherence Pretraining 2% MT cells Post-training Null direction Preferred direction Hypothesis 2: The LIP cells “learn” to “listen” to the more sensitive MT cells LIP cell MT cells 3% Thresholds 15% 2% 30% In MT, Pretraining n = 50 onkey C Figur Motion Sessions 101 strength= 29 MT n n (% COH) 20 10 0 0.2 0.4 0.6 1.0 –0.2 0 0.5 0 Time (s) Time (s) Early b and coherence are 10 reflected in firing 0 rates 20 Monkey C on: direction Training COH (k1) retraining 1.0 0 Sessions 51–100 Sessions Sessions 51–100 101–160 n n =1 3 =34 n = 25 30 (% COH–1) 0.5 Sessions 1–50 40 Sessions 1–50 n = 33 n = 45 20 0.2 0.5 0 0.2 00.4 0.6 0.5 –0.2 0 1.0 0.2 1.0 10 3 Pretraining Monkey Z Training 5 0 –3 0 Monkey Z 10 0.1-s 99.9 diffe 51.2 neuro 25.6 line) 12.8 6.4 monk 03.20.2 0.4 0. motio 0.0 rewa befor 0.04b) M (C viewi dual 0.02 monk CIs. c ion Response (spikes per s) a In MT, nothing really changes Pretraining n = 50 onkey C b Figur Motion Sessions 101 strength= 29 MT n n (% COH) 20 10 0 0.2 0.4 0.6 1.0 –0.2 0 0.5 0 Time (s) Time (s) Training (% COH–1) retraining 1.0 0 Sessions 51–100 Sessions Sessions 51–100 101–160 n n =1 3 =34 n = 25 30 COH (k1) 0.5 Sessions 1–50 40 Sessions 1–50 n = 33 n = 45 20 Monkey C 10 0 0.2 00.4 0.6 0.5 –0.2 0 1.0 0.2 1.0 10 3 Pretraining Monkey Z Training 5 0 0 20 0.2 0.5 –3 0 Monkey Z 10 0.1-s 99.9 diffe 51.2 neuro 25.6 line) 12.8 6.4 monk 03.20.2 0.4 0. motio 0.0 rewa befor 0.04b) M (C viewi dual 0.02 monk CIs. c ion Response (spikes per s) a In LIP, 40 Sessions 1–50 n = 45 Sessions 51–100 n = 43 Sessions 101–160 n = 29 30 20 10 0 0.2 0.4 0.6 Time (s) –0.2 0 0.2 b Early on: direction is (% COH–1) COH (k1) 20 Monkey C 10 (s–1) Time (k2) reflected in firing 0...
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