Neuronal Population Coding of Movement Direction.¶
Georgopoulos, A. P., Schwartz, A. B., & Kettner, R. E. (1986). Neuronal Population Coding of Movement Direction. Science, 233(4771), 1416-1419.
Cited by¶
3 citations across 3 artifacts.
Each citation links to the sentence it supports in the citing article.
Primes¶
- Population Coding
- Neuroscience (origin) — motor cortex represents reach direction by the population vector across many directionally-tuned neurons, visual orientation by population activity in V1, head direction by ring-attractor populations; no individual neuron is precise enough, but the population is.
This sourceIntroduces the population-vector decoding of reach direction across directionally-tuned motor-cortex neurons; the vector sum of cell vectors weighted by firing rate points in the movement direction.
Supported in partVerified against the publisher's abstract
The abstract states that reach direction is uniquely predicted by the activity of a population of directionally-tuned motor-cortex neurons, supporting only the motor-cortex half of the claim.
“The direction of movement was found to be uniquely predicted by the action of a population of motor cortical neurons.”
- Neuroscience (origin) — motor cortex represents reach direction by the population vector across many directionally-tuned neurons, visual orientation by population activity in V1, head direction by ring-attractor populations; no individual neuron is precise enough, but the population is.
- Wisdom of the Crowds
- Neuroscience (non-obvious): Population coding reads out a percept or motor command by pooling many individually noisy neurons; the population estimate is sharper than any single neuron's firing because the independent noise across neurons averages out, a computation Georgopoulos (1986) demonstrated with population-vector decoding of arm-movement direction from motor-cortex populations.
This sourceDemonstrates population-vector decoding: pooling many individually noisy motor-cortex neurons yields a movement-direction estimate far sharper than any single neuron's, the neural instance of crowd aggregation.
Supported in partVerified against the publisher's abstract
Abstract supports population-vector decoding of movement direction from broadly tuned motor-cortex cells, but not the noise-averaging mechanism the claim asserts.
“Although individual neurons in the arm area of the primate motor cortex are only broadly tuned to a particular direction in three-dimensional space, the animal can very precisely control the movement of its arm. The direction of movement was found to be uniquely predicted by the action of a population of motor cortical neurons.”
- Neuroscience (non-obvious): Population coding reads out a percept or motor command by pooling many individually noisy neurons; the population estimate is sharper than any single neuron's firing because the independent noise across neurons averages out, a computation Georgopoulos (1986) demonstrated with population-vector decoding of arm-movement direction from motor-cortex populations.
Mechanisms¶
- Weighted Decoder Model
- The guarding discipline is to cap any element's influence, re-derive weights from recent calibration data, and run an informal leave-one-out check for dominance — the same weighted-sum logic behind population vector decoding, where each element contributes in proportion to its tuning.
This sourceConstructs a population vector by summing neuronal preferred-direction vectors weighted by each neuron's activity.
- The guarding discipline is to cap any element's influence, re-derive weights from recent calibration data, and run an informal leave-one-out check for dominance — the same weighted-sum logic behind population vector decoding, where each element contributes in proportion to its tuning.
Verification¶
Does it exist? Confirmed. This work's DOI resolves to a registered record, which fixes its identity. That is all it fixes.
Does it back the claim? Read against the text for 2 of 3 citations: 2 supported in part. Each verdict is shown under its citation below, with what in the work backs the sentence.
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