How to display PLS results of ERP data

All the PLS results are saved in '*_ERPresult.mat' files.
The result windows will provide you a convenient way to
display:
        1. Significant LVs: Plot Singular Values
        2. Electrode Saliences
        3. Stable effects (bootstrap results)
        4. Average Amplitudes
        5. Detail View for Electrodes
        6. TaskPLS Scores (Scalp Scores, Design Scores)
        7. BehaviourPLS Scores and Correlations

When you open the ERP results window, the default plot is
the electrode saliences for the first LV. If the file
contains bootstrap results, stable differences are also
displayed. Clicking on the wave will display the channel
name and LV number.



- File menu

From the File menu, you can export the plot to a file or
print out the plot.




- Edit Menu

Electrodes can be selected by clicking on the electrode name
or choosing 'Select Electrodes with Rubberband' from Edit
menu. Clicking on the selected electrode again will deselect
the electrode. Choose 'Select All Electrodes' or 'De-Select
All Electrodes' to deal with a large number of electrodes.




- Tool Menu

'Display Options': select which ERPLVs to display. Note that
for TaskPLS, the last LV is the GrandAverage, and will be
essentially zero.

'Bootstrap Options': The default threshold for the bootstrap
results is 95% of the range in the bootstrap ratios for the
LV.  As the bootstrap ratio is similar to a Zscore, the
threshold should typically be >~2.5.


- View Menu

'Average Amplitude': this will open the window to plot ERP
grand averages. The default display is the average for the
first condition, and the bootstrap ratios for the first LV.
Clicking on a wave will display the channel and condition
names.

- View Menu (p.2)

If you click 'Display Condition Difference' under 'Tool menu,
you can also monitor the difference between conditions.

'Plot Detail': If any electrodes have been selected, a
detailed view, including bootstrap results, will be plotted.
(currently no legend is plotted - colours are the same as in
the results window)

'Plot Singular Values': This opens a bar graph window,
which, through its 'View' menu, you can display:

1. Observed Singular Values for the LVs.
2. Proportion Crossblock Covariance accounted for on each LV.
3. Permutation test results (if the number of permutations
is greater than 0). This plot indicates which LVs are
significant.


- View Menu (p.3)

'Plot Design Scores': This window displays the contrasts
distinguishing tasks for each LV.  The default is to plot
the results for the first LV, and first group.  Use the
'View' Menu to switch between the following plot types.

1) Scatterplot of ScalpScores (BrainScores) vs Design
Scores: This plot is ideal for determining if there are any
outlier subjects, or groups of subjects.  Clicking on a
datapoint will identify the subject, and highlight their
ScalpScore in each condition. Selected subjects can be
removed from the datamat in the 'Edit' menu.  You will be
prompted to modify the datamat when the window is closed.

2) Design Scores: This bar graph plots the design scores in
the order of the conditions.  This plot is useful for more
clearly visualizing which conditions differ.

3) Design LV: is proportional to the Design scores.




- View menu (p.4)

'Plot Canonical Scores': This plots scalpscore across the
time periods.

'Contrasts Information': This displays the contrasts data
in bar graph.

'Plot Scalp Scores': This window displays the correlations
of behaviour with Scalp scores (brain scores) for each LV.
The default is to plot the behaviour-scalp score scatterplot
for the first LV (first condition, first behaviour). Use the
'Plot' Menu to switch between the following plot types:



- View menu (p.5)

1) Scatterplot of ScalpScores (BrainScores) vs Behaviour:
This plot is ideal for determining if there are any outlier
subjects, or groups of subjects.  Currently, you must use
the legend to identify subjects.  The scroll bar on the
right will move through the conditions, and the scroll bar
on the bottom will move through the behaviours.  Under the
'Option' Menu, clicking on 'Change Plot Dimension' will
redisplay the scatterplots so that more than one plot is on
the screen at a time. Currently, each behaviour will only be
plotted in a single column.

2) Correlation bar plot: This is available only if
bootstraps were run, and is activated by 'Hide BrainScore
Plot' or 'Show Correlation Plot' in the 'Plot' Menu.  These
are barplots of the brain-behaviour correlations, with the
95% confidence interval for the correlation indicated.
Correlations where the confidence interval includes zero are
considered unreliable.