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Understanding Retinal Ganglion Cell Responses to Light Stimulus through Autocorrelation Analysis

Explore how autocorrelation is calculated and its implications for detecting repetition in responses of retinal ganglion cells to fluctuating light stimuli. Learn about cross-correlation functions using Matlab, Fourier transform applications, and time calculations.

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Understanding Retinal Ganglion Cell Responses to Light Stimulus through Autocorrelation Analysis

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  1. Autocorrelation calculated by: • Notice: • The peak of the function =1 • (its an autocorrelation) • The triangular shape is a result of zero padding • The secondary peaks mean the signal has some repetition

  2. retinal ganglion cell responses to a fluctuating light stimulus

  3. The peaks of the cross correlation functions using Matlab’s “xcorr” Offt, On Offs, On cross correlation coefficient Offs, Offt Offt, Offs Time (ms)

  4. Using the Fourier transform to calculate the cross correlation A = fft (signal a) B = fft (signal b) Fourier Cross Correlation = ifft(A*conj(B))

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