FIGURE 4. Directional tuning during centre-out task.
From the following article:
Neuronal ensemble control of prosthetic devices by a human with tetraplegia
Leigh R. Hochberg, Mijail D. Serruya, Gerhard M. Friehs, Jon A. Mukand, Maryam Saleh, Abraham H. Caplan, Almut Branner, David Chen, Richard D. Penn and John P. Donoghue
Nature 442, 164-171(13 July 2006)
doi:10.1038/nature04970
Peristimulus time histograms show spike rates for five neurons recorded simultaneously during the performance of a four-direction centre-out task (day 90) in which MN used the neural cursor to acquire a target presented at the right, top, left, or bottom of the screen. Twenty trials are displayed for each target location. Increases in activity after the go cue demonstrate movement-intention-related modulation. Each column shows the firing of one unit in the four directions, aligned on the cue to move. Note, for example, the time-locked increase in firing of unit 6 when MN was cued to move the cursor downward (lower right corner) and the lack of change in firing rate for upward instruction. Changes in firing across the five neurons reveal directional tuning.
