more exercises for the reconstruction.

programming/lectures/sta_stc.tex

@@ -333,11 +333,24 @@ ylabel('correlation')
     method to create the PSTH) and convolve (\verb+conv+) it with the
     \textbf{STA}.
   \end{enumerate}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Relating stimulus and response}
+  \framesubtitle{Reverse reconstruction using the \textbf{STA}}
   \textbf{Exercise:}
   \begin{enumerate}
   \item Reconstruct the stimulus from the P-unit data.
   \item Plot original and reconstructed stimulus into the same plot.
   \item Are they similar? In which instances are they different?
+  \item Estimate the differences in terms of the
+    \textit{mean-square-error} you have used in week 2. Normalize it
+    to the standard-deviation of the original stimulus.
+  \item Estimate the \textbf{STA} on the basis of the first half of
+    the data and reconstruct the stimulus of the second half.
+  \item Compare the reconstruction errors. 
+  \item How strongly does the error depend on the amount of data you
+    use?
   \end{enumerate}
 \end{frame}