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Journal of Neuroscience, Vol 11, 1182-1197, Copyright © 1991 by Society for Neuroscience
Making arm movements within different parts of space: the premotor and motor cortical representation of a coordinate system for reaching to visual targets
R Caminiti, PB Johnson, C Galli, S Ferraina and Y Burnod
Istituto di Fisiologia umana, Facolta di Medicina e Chirurgia, Universita degli Studi di Roma La Sapienza, Italy.
The activity of 156 individual arm-related neurons was studied in the
premotor cortex (area 6) while monkeys made arm movements of similar
directions within different parts of 3-dimensional space. This study was
aimed at describing the relationship between premotor cortical cell
activity and direction of arm movement and assessing the coordinate system
underlying this relationship. We found that the activity of 152 (97.4%)
cells varied in an orderly fashion with the direction of movement, in at
least some region of the work space. Premotor cortical cells fired most for
a given preferred direction and less for other directions of movement.
These preferred directions covered the directional continuum in a uniform
fashion across the work space. It was found that, as movements of similar
directions were made within different parts of the work space, the cells'
preferred directions changed their orientation. Although these changes had
different magnitudes for different cells, at the population level, they
followed closely the changes in orientation of the arm necessary to move
the hand from one to another part of the work space. This shift of cells'
preferred direction with the orientation of the arm in space has been
observed with similar characteristics in the motor cortex (see Caminiti et
al., 1990). In both premotor and motor cortices, neuronal movement
population vectors provide a good description of movement direction. Unlike
the individual cell preferred directions upon which they are based,
movement population vectors did not change their spatial orientation across
the work space, suggesting that they remain good predictors of movement
direction regardless of the region of space in which movements are made.
The firing frequency of both premotor and motor cortical neurons varied
significantly with the position occupied by the hand in space. These static
positional effects were observed in 88.5% of premotor and 91.8% of motor
cortical cells. In a second task, monkeys made movements from differing
origins to a common end point. This task was performed within 3 different
parts of space and was aimed at dissociating movement direction from
movement end point. It was found that in both premotor and motor cortices
virtually all cells were related to the direction and not to the end point
of movement. These data suggest that premotor and motor cortices use common
mechanisms for coding arm movement direction. They also provide a basis for
understanding the coordinate transformation required to move the hand
toward visual targets in space.
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