J. Soechting and M. Flanders. Sensorimotor representations for pointing to targets in three dimensional space. Journal of Neurophysiology, 62(2):582--594, 1989.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....structure is proposed by Kondo [20] It decouples the problem into finding an upper and lower arm posture to match the hand position first and then computing the wrist joint angles to match the hand orientation. The computation of hand posture follows a model based on results from neurophysiology [39] [38] The extra dof in the upper lower arm (4 dofs) for positioning the hand (3 dofs) is used to select feasible (within joint limits) joint angles of the shoulder and elbow joints. Since the neurophysiology model is only an approximate model, final adjustment of the joint angles using a ....

J. F. Soechting and M. Flanders. Sensorimotor representations for pointing to targets in three-dimensional space. Journal of Neurophysiology, 62(2):582--594, Aug 1989.

....the two coordinate systems. Subsequent studies, also based on the analysis of dependences among errors, suggest that the transformation from elevation and distance of the target to arm elevation may be computed separately from the transformation from target azimuth to arm yaw angle (Flanders and Soechting, 1990). In this paper we explore the representation of the visuomotor transformation through a different paradigm, which analyzes the pattern of adaptation arising from a local perturbation of the visuomotor relationship. This paradigm makes it possible to address two questions. First, what effects do ....

Soechting, J. and Flanders, M. (1989b). Sensorimotor representations for pointing to targets in three-dimensional space. J.Neurophysiol., 62:582--594.

.... depending on the starting location of the movement (see Methods for details) This perturbation creates a conflict in the visuomotor map, the internal model [18] of the kinematics of the arm which captures the normally one to one relation between visually perceived and actual hand locations [19, 20, 21]. One way to resolve this conflict is to develop two separate visuomotor maps, the expert modules, each appropriate for one of the two starting locations (Figure 1) A separate mechanism, the gating module, then combines, based on the starting location of the movement, the outputs of the two ....

Soechting, J. F. and Flanders, M. Sensorimotor representations for pointing to targets in threedimensional space. J. Neurophysiology 62, 582--594 (1989).

....the arms must have an inverse kinematics algorithm. Thus, in addition to the planner, we present a new inverse kinematics algorithm for the human arms based on results from neurophysiology. This algorithm resolves the redundancy of the human arms by utilizing a sensorimotor transformation model [29, 30]. The result is the automatic animation of human arm manipulation tasks. In addition to the motion planning aspect, we address the issue of producing natural motions when human figures are animated. By applying results from neurophysiology to various parts of the planner, for instance the inverse ....

....working to determine how the human brain manages to coordinate the motion of its limbs. Soechting [31] gives a good survey of various empirical studies and their results for human arm motions. One relevant finding is the sensorimotor transformation model devised by Soechting and Flanders [29, 30]. They found that the desired position of the hand roughly determines the arm posture. Our inverse kinematics algorithm for the human arm is based on this result. 3 Manipulation Planner In this section we present our manipulation planning algorithm. The method applies to any system of arms as ....

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J.F. Soechting and M. Flanders, "Sensorimotor Representations for Pointing to Targets in Three Dimensional Space," Journal of Neurophysiology, Vol. 62, No. 2, 1989, pp.582-594.

....the distance that their arm has moved, we set the gain that couples force to state estimates to a value that is larger than its veridical value. This setting is consistent with independent data that subjects tend to under reach in pointing tasks, suggesting an overestimation of distance traveled (Soechting Flanders 1989). All other components of the internal model were set to their veridical values. Simulations of the Kalman filter demonstrated the two distinct phases of bias propagation observed (Figure 6) By overestimating the force acting on the arm the forward model overestimates the distance traveled, an ....

Soechting, J. & Flanders, M. (1989). Sensorimotor representations for pointing to targets in three-dimensional space, J. Neurophysiology 62: 582--594.

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J. Soechting and M. Flanders. Sensorimotor representations for pointing to targets in three dimensional space. Journal of Neurophysiology, 62(2):582--594, 1989.

No context found.

Soechting, J. F. and Flanders, M. (1989b). Sensorimotor representations for pointing to targets in threedimensional space. J. Neurophysiology, 62:582--594.

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