Influence of Gaze Position on Grasp Parameters For Reaches to Visible and Remembered Stimuli

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dc.contributor.advisorCrawford, John Douglas
dc.creatorAlomawi, Noura Abdullah
dc.date.accessioned2015-08-28T15:36:06Z
dc.date.available2015-08-28T15:36:06Z
dc.date.copyright2015-04-23
dc.date.issued2015-08-28
dc.date.updated2015-08-28T15:36:06Z
dc.degree.disciplineKinesiology & Health Science
dc.degree.levelMaster's
dc.degree.nameMSc - Master of Science
dc.description.abstractIn order to pick up or manipulate a seen object, one must use visual signals to aim and transport the hand to the object’s location (reach), and configure the digits to the shape of the object (grasp). It has been shown that reach and grasp are controlled by separate neural pathways. In real world conditions, however, all of these signals (gaze, reach, grasp) must interact to provide accurate eye-hand coordination. The interactions between gaze, reach, and grasp parameters have not been comprehensively studied in humans. The purpose of the study was to investigate 1) the effect of gaze and target positions on grasp location, amplitude, and orientation, and 2) the influence of visual feedback of the hand and target on the final grasp components and on the spatial deviations associated with gaze direction and target position. Seven subjects reached to grasp a rectangular “virtual” target presented at three orientations, three locations, and with three gaze fixation positions during open- and closed-loop conditions. Participants showed gaze- and target-dependent deviations in grasp parameters that could not be predicted from previous studies. Our results showed that both reach- and grasp-related deviations were affected by stimulus position. The interaction effects of gaze and reach position revealed complex mechanisms, and their impacts were different in each grasp parameter. The impacts of gaze direction on grasp deviation were dependent on target position in space, especially for grasp location and amplitude. Gaze direction had little impact on grasp orientation. Visual feedback about the hand and target modulated the reach- and gaze- related impacts. The results suggest that the brain uses both control signal interactions and sensorimotor strategies to control and plan reach-and-grasp movements.
dc.identifier.urihttp://hdl.handle.net/10315/30071
dc.language.isoen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectNanoscience
dc.subjectBehavioral sciences
dc.subjectCognitive psychology
dc.subject.keywordsEye-Hand Coordination
dc.subject.keywordsGrasping
dc.subject.keywordsGaze
dc.subject.keywordsGrasp
dc.subject.keywordsReach
dc.subject.keywordsReaching
dc.subject.keywordsEffects of gaze direction on grasping
dc.subject.keywordsEffects of target orientation on grasping
dc.subject.keywordsEffects of target position on grasping
dc.subject.keywordsEffects of gaze on rasping parameters
dc.subject.keywordsEffects of stimulus angle on grasping
dc.subject.keywordsHand
dc.subject.keywordsKinematic
dc.subject.keywordsVisual feedback
dc.subject.keywordsSensory
dc.subject.keywordsMotor
dc.subject.keywordsTilted stimuli
dc.subject.keywordsObject demands
dc.subject.keywordsRemembered objects
dc.subject.keywordsVisible objects
dc.subject.keywordsMovement direction
dc.subject.keywordsSensory motor integration
dc.subject.keywordsGrip amplitude
dc.subject.keywordsGrip aperture
dc.subject.keywordsHand control
dc.subject.keywordsMovement control interaction of gaze and grasp
dc.subject.keywordsInteraction of gaze and reach
dc.subject.keywordsPrehension movement
dc.subject.keywordsVisual based movement
dc.subject.keywordsGaze dependent errors
dc.subject.keywordsStimulus position
dc.subject.keywordsStimulus orientation
dc.subject.keywordsGaze position
dc.subject.keywordsEye position
dc.subject.keywordsGrasp components
dc.subject.keywordsSensorimotor transformation
dc.subject.keywordsVisuomotor transformation
dc.subject.keywordsHand orientation
dc.subject.keywordsGrasp orientation
dc.subject.keywordsGrasp direction
dc.subject.keywordsHand direction
dc.subject.keywordsTarget position
dc.subject.keywordsTarget orientation
dc.titleInfluence of Gaze Position on Grasp Parameters For Reaches to Visible and Remembered Stimuli
dc.typeElectronic Thesis or Dissertationen_US

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