-Gaurav Mishra -Pulkit Agrawal. How do neurons work Stimuli  Neurons respond (Excite/Inhibit) ‘Electrical Signals’ called Spikes Spikes encode information.

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Presentation transcript:

-Gaurav Mishra -Pulkit Agrawal

How do neurons work Stimuli  Neurons respond (Excite/Inhibit) ‘Electrical Signals’ called Spikes Spikes encode information !! (Many Models)

Our Case… Stimuli  Video of Natural Images Response of 12 V1 neurons  #Spikes

Our Data… A movie for each neuron Frames  Down sampled images (16x16) Each frame Image spans twice the receptive field diameter 16ms in duration Known: #Spikes/frame To build a model correlating stimulus and spike count.

Method 1: RNNs Recursive neural networks Composed of feed forward and feed back subnets. Were initially designed for the purpose of controlling nonlinear dynamical systems Source: Hush et al. The Recursive Neural Network and its Application in Control Theory. Computers Elect. Engng. Vol. 19, No. 4, pp , 1993

An exemplary recursive multi-layer perceptron:

Echo State Networks Dynamic neural networks The hidden layer of ESN consists of a single large reservoir with neurons connected to each other randomly.

Using RNNs RNNs have been used for inverse modeling purposes Can handle time series data because of the presence of feed back and delay mechanisms May need to down sample data even further to keep network size manageable.

Results Accuracy: Average: around 50 percent Best Case: 89 percent But does percentage error give the correct picture? No. The correlation coefficient gives a more accurate picture of the performance of the network.

Results Average CC: 0.15

STRF Problem: Stimulus Black Box Spike Rate Concept of ‘Filter’ Space and Time both ! Latency !

Phase Invariance..

The Math of Estimation..

Current Results Using ADABOOST: Accuracy: 34 percent CC: SRTF CC:

References Predicting neural responses during natural vision, S. David, J.Gallant, Computation in neural systems 2005 Wikipedia article on neural coding ( Theunissen et al., Estimating spatial temporal receptive ﬁeld of auditory and visual neurons from their responses to natural stimuli.Network: Comp Neural Systems 12:289–316. Hush et al. The Recursive Neural Network and its Application in Control Theory. Computers Elect. Engng. Vol. 19, No. 4, pp , 1993 Le Yang, Yanbo Xue. Development of A New Recurrent Neural Network Toolbox (RNN-Tool) ( ng_Xue.pdf) ng_Xue.pdf