Table 2.
Database and cell classification during reach
| General classification | EP | GPe | Total |
|---|---|---|---|
| Total number of analyzed cells | 81 | 35 | 116 |
| Task-related cells (contralateral or ipsilateral) | 75 | 26 | 101 |
| Task-related cells (contralateral reach) | 68 | 23 | 91 |
| Task-related cells (ipsilateral reach) | 60 | 15 | 75 |
| Task-related cells (contralateral and ipsilateral reach) | 52 | 13 | 65 |
| Periods of task-related activity during contralateral reach | 137 | ||
| Classification during contralateral reach | EP (68) | Gpe (23) | Total (91) |
| Cells with significant change in activity in transport phase | 27 (40%) | 13 (56%) | 40 (44%) |
| Dynamic increase | 9 | 3 | 12 |
| Dynamic decrease | 7 | 5 | 12 |
| Tonic | 11 | 5 | 16 |
| Cells with significant change in activity during lever press | 40 (59%) | 13 (56%) | 53 (58%) |
| Dynamic increase | 24 | 10 | 34 |
| Dynamic decrease | 7 | 2 | 9 |
| Tonic increase | 3 | 1 | 4 |
| Tonic decrease | 6 | 0 | 6 |
| Go-related cells | 12 (18%) | 6 (26%) | 18 (20%) |
| Defined by linear regression and/or variance | 10 | 4 | 14 |
| Defined on the bases of a short latency modification | 2 | 2 | 4 |
| Cells with significant changes during the cue period | 6 (9%) | 2 (9%) | 8 (9%) |
| Cells with significant changes during the late period | 19 (21%) |
Number of cells recorded in the EP and GPe that showed significant modification of their activity during contralateral and ipsilateral reaches together with a detailed tabulation of the number of cells discharging at different times during the contralateral reach. Values in brackets indicate the number of cells as a percentage of the total number of task-related cells in the EP (N = 68), in the GPe (N = 23), or regardless of the localization of the cell (total, N = 91). Note that many cells discharged during multiple periods of the task, so total numbers are >91, and total percentage is >100. The lines in italics define different classes of cells as used in the text.