CinePlex v3 Manual - Plexon Inc

5.10 Analyzing CinePlex Studio data with NeuroExplorer
As discussed in “Export to NEX” on page 244, data can be exported from Cine-
Plex Editor as a NEX file and read into NeuroExplorer. In this case, CinePlex
Editor can perform latency corrections as described in the previous sections, and
the data read into NeuroExplorer will be already corrected for latency.
However, a PLX file containing coordinates from CinePlex Studio can also be
read directly into NeuroExplorer. NeuroExplorer can decipher the Video Tracker
protocol strobe codes (See Appendix D) and turn them into continuous variables.
In this case, the timestamps for the coordinates should be corrected for latency
within Neuroexplorer. Note that since NeuroExplorer does not have access to the
frame times (stored in AVI and DVT files), it needs to compensate both for the
video latency (see “Correcting for Video Latency” on page 282) and for the tracking
latency (see “Aligning Tracker Coordinates to Frames” on page 284) by subtracting
a larger number from the position timestamps. To configure the latency
correction, from the View menu select Data Import Options. In the Data
Import Options dialog box, click the Plexon Files tab. In the Strobed Events
area, enter a latency value in the Position events latency (seconds) field.
The default value for this latency correction in the screenshot is 75 milliseconds
(appropriate for the Plexon Video Tracker product, but too high for CinePlex Studio).
A more appropriate number is 31 milliseconds (21 milliseconds video
latency plus about 10 milliseconds of tracking latency).
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