PMID-3411362[0] Primate motor cortex and free arm movements to visual targets in three-dimensional space. II. Coding of the direction of movement by a neuronal population.
- This is the paper where they do predictions, and show that they can offline 'decode' 3D reaching movements.
- Pretty spiffy 3D graphics, too.
- Used three analyses to estimate variability of the population vector.
- 1. Random sampling of the experimentally observed population (N= 475), using the mean discharge rate of each cell to each direction.
- 2. Same cell population, but variability of discharge was drawn from a normal distro estimated from the mean and variance of the trial-to-trial recordings.
- 3. Random sampling + trial-to-trial variability.
- Plot 95% confidence interval over population size for the estimated direction; asymtopes at about 15%. Why not measured in steradians?
- Figure 4 looks to have good SNR, and they look to be dataheads.
- Use a bunch of different weighting functions to calculate the population vector; no numerical optimization?
- best one basically looks like normalized, mean-removed firing rate.
____References____
[0] Georgopoulos AP, Kettner RE, Schwartz AB, Primate motor cortex and free arm movements to visual targets in three-dimensional space. II. Coding of the direction of movement by a neuronal population.J Neurosci 8:8, 2928-37 (1988 Aug) |
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