Channel

Analysis

• Raster - for spike data, each spike is plotted as a vertical line segment and the x-axis is Time. Often, time t=0 is the reference point for the beginning of the trial.

• PSTH - Peri-stimulus time histogram. This represents the mean instantaneous firing rate around some temporal reference (usually t=0). A binsize is chosen, and the mean firing rate within a bin is computed by averaging spikes within that bin across all trial within each group.

• ISI - Inter-spike interval distributions for spike data.

• Tuning_Curve - A single value is associate with each group and is plotted against one of the variable parameters along the x-axis. For a spike channel, the y-value is usually the mean firing rate averaged across time. For a continuous channel, the y-value is typically the average of the data over time.

• Var_vs_Mean - Variance of spike count vs. mean spike count.

• Choice_Prob - Choice probability (CP). This analysis computes the CP for a given spike channel with respect to a decision variable. The decision variable is specified by the parameter decision_var, it should take only values of 0 or 1, and this variable parameter should have the Group by button unchecked in the variable parameter panel. The CP value will be printed, along with the number of trials for each choice, at the top of the plot window, which shows the distributions of spike counts for Choice 0 and Choice 1.

• Plot - For continous data, this is a simple plot of the raw data values vs. time.

• CCG - Cross-correlation, and auto-correlation, for spike data. Channel 0 is the time reference, thus a peak to the right of zero indicates that Channel 1 follows Channel 0.

• SC_Corr - Spike count correlation, scatter plot and Pearson's r-value. The plot_type option can be:
  • scatter - Regular scatter plots, one for each group.
  • zscore - Points from each group are transformed to z-scores. An addition group, Overall is add that contains the points from all other groups combined, and has an overall r-value.

• Tuning_Corr - Tuning curve correlation, for signal correlation estimation. This analysis computes the correlation coefficient between two tuning curves. Only the mean values are used. In the Param menu, the plot_type option can be:
  • tuning - Regular tuning curves
  • scatter - Means from tuning curves are plotted against each other in a scatter plot form

• Pop_Dynamic - Dynamic map of population activity. The plot shows a map of the response (normalized to the largest value in the display frame) for the given population in a time window. The time window is set by the Dynamic time window controls (ti is the index of the time segment, and dt is the length of the time segment during which the response is computed). The time window is relative to t0, which is set via the Param button. The .nd file must include a set of channels having the format pname_0_0 ... pname_M_N, where 'pname' is the population name and 'M'-1 and 'N'-1 are the numbers of units in the x- and y-dimensions.

Param button

Plot Window