TY - JOUR

T1 - A multidimensional model of the effect of gravity on the spatial orientation of the monkey

AU - Merfeld, Daniel M.

AU - Young, Laurence R.

AU - Oman, Charles M.

AU - Shelhamer, Mark J.

PY - 1993/6

Y1 - 1993/6

N2 - A "sensory conflict" model of spatial orientation was developed. This mathematical model was based on concepts derived from observer theory, optimal observer theory, and the mathematical properties of coordinate rotations. The primary hypothesis is that the central nervous system of the squirrel monkey incorporates information about body dynamics and sensory dynamics to develop an internal model. The output of this central model (expected sensory afference) is compared to the actual sensory afference, with the difference defined as "sensory conflict." The sensory conflict information is, in turn, used to drive central estimates of angular velocity ("velocity storage"), gravity ("gravity storage"), and linear acceleration ("acceleration storage") toward more accurate values. The model successfully predicts "velocity storage" during rotation about an earth-vertical axis. The model also successfully predicts that the time constant of the horizontal vestibulo-ocular reflex is reduced and that the axis of eye rotation shifts toward alignment with gravity following postrotatory tilt. Finally, the model predicts the bias, modulation, and decay components that have been observed during off-vertical axis rotations (OVAR).

AB - A "sensory conflict" model of spatial orientation was developed. This mathematical model was based on concepts derived from observer theory, optimal observer theory, and the mathematical properties of coordinate rotations. The primary hypothesis is that the central nervous system of the squirrel monkey incorporates information about body dynamics and sensory dynamics to develop an internal model. The output of this central model (expected sensory afference) is compared to the actual sensory afference, with the difference defined as "sensory conflict." The sensory conflict information is, in turn, used to drive central estimates of angular velocity ("velocity storage"), gravity ("gravity storage"), and linear acceleration ("acceleration storage") toward more accurate values. The model successfully predicts "velocity storage" during rotation about an earth-vertical axis. The model also successfully predicts that the time constant of the horizontal vestibulo-ocular reflex is reduced and that the axis of eye rotation shifts toward alignment with gravity following postrotatory tilt. Finally, the model predicts the bias, modulation, and decay components that have been observed during off-vertical axis rotations (OVAR).

KW - model

KW - monkey

KW - spatial orientation

KW - vestibulo-ocular reflex

UR - http://www.scopus.com/inward/record.url?scp=0027606077&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027606077&partnerID=8YFLogxK

M3 - Article

C2 - 8275250

AN - SCOPUS:0027606077

SN - 0957-4271

VL - 3

SP - 141

EP - 161

JO - Journal of Vestibular Research

JF - Journal of Vestibular Research

IS - 2

ER -