Neuroscience 2000 Abstract
| Presentation Number: | 359.2 |
|---|---|
| Abstract Title: | Effector-independent activity in primate dorsal premotor cortex (PMd) during instructed-delay tasks. |
| Authors: |
Kalaska, J. F.*1
; Cisek, P.1
; Crammond, D. J.2
1Physiologie, U. Montreal, Montreal, Canada 2Neurosurgery, U. Pittsburgh, Pittsburgh, PA |
| Primary Theme and Topics |
G. Motor Systems and Sensorimotor Integration - 86. Cortex and thalamus |
| Session: |
359. Cortex and thalamus: premotor Poster |
| Presentation Time: | Monday, November 6, 2000 2:00 PM-3:00 PM |
| Location: | Hall G-J |
| Keywords: | REACHING MOVEMENTS, PREPARATORY ACTIVITY |
It has been reported that instructed delay period (IDP) activity in PMd often covaried with the direction of intended arm movements when monkeys used either the arm contra- or ipsilateral to the recording site (Crammond & Kalaska, SFN Abst 17:308, 1991). Furthermore, the discharge directionality was often similar for both arms (i.e. not mirror-transposed). Of 60 PMd cells tested in that study, 47 showed differences in the preferred direction (PD) of IDP activity of < 45° between the two arms (mean absolute difference: 38°). Here we report similar results from a different IDP task (Cisek & Kalaska, SFN Abst 25:381, 1999). Of 22 PMd cells tested with each arm separately, 19 were directionally-tuned for movements made with either arm. The PDs of IDP activity recorded with each arm were also very similar, with 18/19 cells showing differences in PD of < 30° (mean absolute difference: 8°). The PDs for each arm were significantly different for only 2/19 cells, based on bootstrap estimates of confidence intervals. The monkey was not trained to fixate, and an infrared oculometer was used to measure eye position. Regressions of cell activity vs. gaze angle, during the multiple voluntary fixations in each trial, showed only modest gaze-related modulation (see adjoining abstract) which could not account for the similar directionality of IDP activity with each arm. These two studies suggest that IDP activity in PMd covaries mainly with the intended direction of reaching movements, but the directionality of that activity is largely independent of the end-effector used to perform the movements.
Supported by MRC Group Grant in Neurological Sciences. PC supported by NIH
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2000 Neuroscience Meeting Planner. New Orleans, LA: Society for Neuroscience, 2000. Online.
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