65 lines
2.1 KiB
TeX
65 lines
2.1 KiB
TeX
\documentclass[a4paper,12pt,pdftex]{exam}
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\newcommand{\ptitle}{Serial ISI correlations}
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\input{../header.tex}
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\firstpagefooter{Supervisor: Jan Benda}{phone: 29 74573}%
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{email: jan.benda@uni-tuebingen.de}
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\begin{document}
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\input{../instructions.tex}
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%%%%%%%%%%%%%% Questions %%%%%%%%%%%%%%%%%%%%%%%%%
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\begin{questions}
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\question P-unit electroreceptor afferents of the gymnotiform weakly
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electric fish \textit{Apteronotus leptorhynchus} are spontaneously
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active when the fish is not electrically stimulated.
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How do the firing rates and the serial correlations of the
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interspike intervals vary between different cells?
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In the file \texttt{baselinespikes.mat} you find two variables:
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\texttt{cells} is a cell-array with the names of the recorded cells
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and \texttt{spikes} is a cell array containing the spike times in
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seconds of recorded spontaneous activity for each of these cells.
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\begin{parts}
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\part Load the data! How many cells are contained in the file?
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\part Plot the spike rasters of a few cells.
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For the presentation, choose a few cells based on the results of
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this project.
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By just looking on the spike rasters, what are the differences
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between the cells?
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\part Compute the firing rate of each cell, i.e. number of spikes per time.
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Illustrate the results by means of a histogram and/or box whisker plot.
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\part Compute and plot the serial correlations between interspike intervals up to lag 10.
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What do you observe? In what way are the interspike-interval
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correlations similar betwen the cells? How do they differ?
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\part Implement a permutation test for computing the significance
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at an appropriate significance level of the serial
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correlations. Keep in mind that you test the correlations at 10
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different lags. At which lags are the serial correlations
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statistically significant?
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\part Are the serial correlations somehow dependent on the firing rate?
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Plot the significant correlations against the firing rate. Do you
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observe any dependence?
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Use an appropriate statistical test to support your observation.
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\end{parts}
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\end{questions}
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\end{document}
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