Afferent input, efference copy, signal noise, and biases in perception of joint angle during active versus passive elbow movements.

Neurophysiol V . Gritsenko , N . I . Krouchev and J . F . Kalaska Passive Elbow Movements in Perception of Joint Angle During Active Versus Afferent Input , Efference Copy , Signal Noise , and Biases

Afferent Input, Efference Copy, Signal Noise and Biases in Perception of Joint Angle during Active versus Passive Elbow Movements Introduction

Psychophysical studies have reported an overestimation of limb position in the direction of movement during the early part of active movements. The main hypothesis tested in this study is that the overestimation results from a process of forward prediction of limb state driven by an efference copy of the outgoing motor command. This hypothesis predicts that position overestimation should decrea...

Where is your arm? Variations in proprioception across space and tasks.

The sense of limb position is crucial for movement control and environmental interactions. Our understanding of this fundamental proprioceptive process, however, is limited. For example, little is known about the accuracy of arm proprioception: Does it vary with changes in arm configuration, since some peripheral receptors are engaged only when joints move toward extreme angles? Are these varia...

Responses of somatosensory area 2 neurons to actively and passively generated limb movements.

Control of reaching movements requires an accurate estimate of the state of the limb, yet sensory signals are inherently noisy, because of both noise at the receptors themselves and the stochastic nature of the information representation by neural discharge. One way to derive an accurate representation from noisy sensor data is to combine it with the output of a forward model that considers bot...

Neurophysiol V . Gritsenko , N . I . Krouchev and J . F . Kalaska Versus Passive Elbow Movements Biases in Perception of Joint Angle During Active

[PDF] [Full Text] [Abstract] , April 1, 2008; 99 (4): 1653-1671. J Neurophysiol N. Gosselin-Kessiby, J. Messier and J. F. Kalaska Reaching Movements to Stationary Targets Evidence for Automatic On-Line Adjustments of Hand Orientation During Natural [PDF] [Full Text] [Abstract] 2009; 106 (3): 950-958. J Appl Physiol Janette L. Smith, Matthew Crawford, Uwe Proske, Janet L. Taylor and Simon C....