T19_Decision Making

2 04 06 10 monkey z 02 0 02 0 02 04 06 c 5 0 10 5 0 02

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: rates; coherence 20 really isnʼt 10 0 0 0.2 0.4 0.6 10 Monkey Z –0.2 0 0.2 0 0.2 0.4 0.6 c 5 0 10 5 0 –0.2 0 0.04 Monkey C 0.02 per s per session Response (spikes per s) a 0 0.04 Monkey Z Motion strength (% COH) 99.9 51.2 25.6 12.8 6.4 3.2 0.0 0.2 In LIP, you see big learning effects 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 rates; coherence 20 really isnʼt 10 0 0 0.2 0.4 0.6 10 Monkey Z 5 0 10 5 0 –0.2 0 0.2 0 0.2 0.4 0.6 –0.2 0 Motion strength (% COH) 99.9 51.2 25.6 12.8 6.4 3.2 0.0 0.2 0.04 Monkey cLater: firingCrates increase to the 0.02 preferred direction; coherence spreads per s per session Response (spikes per s) a 0 0.04 Monkey Z Hypothesis 2: The LIP cells “learn” to “listen” to the more sensitive MT cells LIP cell MT cells 3% Thresholds 15% 2% 30% LIP “response fields” (RF) Similar to a “receptive field”, but for an eye movement The region of space that an LIP cells will respond to when preparing to make an eye movement LIP neurons also respond to sensory stimuli and their “receptive field” usually overlaps their “response field” Does LIP reflect other types of decisions? (e.g. Those that have nothing to do with eye movements)? Task: determine whether two shapes belong to the same “pair” Learned pairs If the second stimulus is the pair of the first, release a bar; if not, keep holding on (and the next stimulus will be the pair; release then) Does LIP reflect other types of decisions? (e.g. Those that have nothing to do with eye movements)? Task: determine whether two shapes belong to the same “pair” Learned pairs Example cell 1 Example cell 2 During the delay period, the firing rate of LIP cells is similar for members of the same pair The LIP population reflects the decision...
View Full Document

This note was uploaded on 09/08/2013 for the course BBB 217 taught by Professor Nicolerust during the Spring '12 term at UPenn.

Ask a homework question - tutors are online