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Electrical stimulation: During the MGS task described above, electrical stimulation was delivered to V4 during the fixation, visual, delay, or saccade period on 50% of trials (on the other 50% of trials there was no stimulation). For identifying antidromically and orthodromically activated FEF neurons (see below), and evaluating stimulation efficacy, electrical stimulation consisted of a single biphasic current pulse (600–1,000 μA; 0.25 ms duration, positive phase first). Stimulation times were 500 ms after initiating fixation (fixation), 500 ms after visual cue onset (visual), 500 ms after cue offset (delay), or 150 ms after the go cue (saccade).
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+File format: For each recording session, two files are provided within a single .zip file: raw neurophysiological recording data (.plx file; separate channels for spike waveform and LFP data), and corresponding behavioral/task data (.txt file). Files from the same session share the same filename.
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+The text file, generated by the CORTEX system, contains time stamps for task events (e.g. visual stimulus onset, TURN_TEST0_ON), behavioral events (e.g., fixation, correct/incorrect trials), and eye position data (collected at 1kHz). The text descriptions of most encodes should be self-explanatory. In the plexon file, event 5 indicates the end of the trial (corresponds to STOP_FHC in .txt file). Event 3 (in the .plx file) marks stimulation time. Condition numbers (1-16) define the MGS cue position (in or opposite estimated RF), and whether and in which epoch V4 stimulation occurs, as follows: cue appeared in the RF for odd conditions, opposite for even conditions. V4 stimulation occured on conditions 1-8 (fixation period cond 1&2, cue period cond 3&4, delay period cond 5&6, saccade period cond 7&8); no stimulation on conditions 9-16.
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