"PROPRIOCEPTIVE MATCHING SUPPORTS ONLINE REACHES THAT ARE REFRACTORY TO" by Bruce David Arthur Craine

Date of Award

2010

Degree Type

Thesis

Degree Name

Master of Science

Program

Kinesiology

Supervisor

Dr. Matthew Heath

Abstract

My thesis sought to determine whether the presence of a proprioceptive map influences the degree to which goal-directed reaching movements are “tricked” by a pictorial illusion. To accomplish this objective, participants performed goal-directed reaches in both proprioceptive matching and no-matching conditions to targets embedded in a centered or proximally or distally displaced frame (the so-called induced Roelofs effect: IRE). During the proprioceptive matching condition, participants were instructed to match the location of a visual target with their unseen non-reaching hand. In the no­ matching condition, participants performed the same reaching response as above, but without the aid of proprioceptive matching from the non-reaching hand. Results showed that reaches in the proprioceptive matching condition were refractory to the IRE during the early and the late stages of the trajectory whereas no-matching reaches were tricked from40%to100%ofmovementtime. Moreover,detailedexaminationofreach kinematics indicated that responses in the matching condition were controlled more online than those in the no-matching condition. Thus, I propose that actions in a proprioceptive matching condition are supported via restrictive egocentric visual cues that are immune to the illusory properties of a visual stimulus. In contrast, when reaches are performed without a proprioceptive match, actions are specified offline and supported via integrative allo- and egocentric visual cues that render motor output susceptible to the illusion-inducing features of a visual stimulus

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