improved projects

projects/project_serialcorrelation/serialcorrelation.tex

@@ -16,10 +16,9 @@
   \question P-unit electroreceptor afferents of the gymnotiform weakly
   electric fish \textit{Apteronotus leptorhynchus} are spontaneously
   active when the fish is not electrically stimulated. 
-  \begin{itemize}
-  \item How do the firing rates and the serial correlations of the
-    interspike intervals vary between different cells?
-  \end{itemize}
+
+  How do the firing rates and the serial correlations of the
+  interspike intervals vary between different cells?
 
   In the file \texttt{baselinespikes.mat} you find two variables:
   \texttt{cells} is a cell-array with the names of the recorded cells
@@ -34,7 +33,7 @@
     this project.
 
     By just looking on the spike rasters, what are the differences
-    betwen the cells?
+    between the cells?
 
     \part Compute the firing rate of each cell, i.e. number of spikes per time.
 
@@ -46,15 +45,18 @@
     correlations similar betwen the cells? How do they differ?
 
     \part Implement a permutation test for computing the significance
-    at a 1\,\% level of the serial correlations. Illustrate for a few
-    cells the computed serial correlations and the 1\,\% and 99\,\%
-    percentile from the permutation test. At which lag are the serial
-    correlations clearly significant?
+    at an appropriate significance level of the serial
+    correlations. Keep in mind that you test the correlations at 10
+    different lags. At which lags are the serial correlations
+    statistically significant?
 
     \part Are the serial correlations somehow dependent on the firing rate?
 
     Plot the significant correlations against the firing rate. Do you
     observe any dependence?
+
+    Use an appropriate statistical test to support your observation.
+
   \end{parts}
 
 \end{questions}