Open Access Theses and Dissertations

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You searched for subject:(power grip). Showing records 1 – 3 of 3 total matches.

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University of Plymouth

1. Dixon, Thomas Oliver. An electrophysiological examination of visuomotor activity elicited by visual object affordances.

Degree: PhD, 2016, University of Plymouth

URL: http://hdl.handle.net/10026.1/6758 

A wide literature of predominantly behavioural experiments that use Stimulus Response Compatibility (SRC) have suggested that visual action information such as object affordance yields rapid and concurrent activation of visual and motor brain areas, but has rarely provided direct evidence for this proposition. This thesis examines some of the key claims from the affordance literature by applying electrophysiological measures to well established SRC procedures to determine the verities of the behavioural claims of rapid and automatic visuomotor activation evoked by viewing affording objects. The temporal sensitivity offered by the Lateralised Readiness Potential and by visual evoked potentials P1 and N1 made ideal candidates to assess the behavioural claims of rapid visuomotor activation by seen objects by examining the timecourse of neural activation elicited by viewing affording objects under various conditions. The experimental work in this thesis broadly confirms the claims of the behavioural literature however it also found a series of novel results that are not predicted by the behavioural literature due to limitations in reaction time measures. For example, while different classes of affordance have been shown to exert the same behavioural facilitation, electrophysiological measures reveal very different patterns of cortical activation for grip-type and lateralised affordances. These novel findings question the applicability of the label ‘visuomotor’ to grip-type affordance processing and suggest considerable revision to models of affordance. This thesis also offers a series of novel and surprising insights into the ability to dissociate afforded motor activity from behavioural output, into the relationship between affordance and early visual evoked potentials, and into affordance in the absence of the intention to act. Overall, this thesis provides detailed suggestions for considerable changes to current models of the neural activity underpinning object affordance.

Subjects/Keywords: 616.8; Affordance; visuomotor; Electroencephalography; EEG; Vision for action; Embodied Cognition; embodiment; embodied; cognitive neuroscience; cognitive; cognitive psychology; psychology; electrophysiology; affordance; object; stimulus response compatibility; compatibility effect; intentional action; absence of intention; compatibility; go; no go; backward mask; consecutive object presentation; p1; n1; visual; motor; lateralised readiness potential; LRP; grip; grasp; grip type; power grip; precision grip; visual evoked potential

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Dixon, T. O. (2016). An electrophysiological examination of visuomotor activity elicited by visual object affordances. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/6758

Chicago Manual of Style (16th Edition):

Dixon, Thomas Oliver. “An electrophysiological examination of visuomotor activity elicited by visual object affordances.” 2016. Doctoral Dissertation, University of Plymouth. Accessed February 25, 2021. http://hdl.handle.net/10026.1/6758.

MLA Handbook (7th Edition):

Dixon, Thomas Oliver. “An electrophysiological examination of visuomotor activity elicited by visual object affordances.” 2016. Web. 25 Feb 2021.

Vancouver:

Dixon TO. An electrophysiological examination of visuomotor activity elicited by visual object affordances. [Internet] [Doctoral dissertation]. University of Plymouth; 2016. [cited 2021 Feb 25]. Available from: http://hdl.handle.net/10026.1/6758.

Council of Science Editors:

Dixon TO. An electrophysiological examination of visuomotor activity elicited by visual object affordances. [Doctoral Dissertation]. University of Plymouth; 2016. Available from: http://hdl.handle.net/10026.1/6758


University of Waterloo

2. Willms, Kirsten. An examination of glove attributes and their respective contributions to force decrement and increased effort in power grip at maximal and submaximal levels.

Degree: 2006, University of Waterloo

URL: http://hdl.handle.net/10012/2800 

Gloved work has been shown to increase the effort required to perform manual tasks. In power grip tasks, these differences have been observed as reductions in strength and increases in muscular effort. Decreases in force output have been attributed to a number of factors, including loss of tactile sensitivity, glove flexibility or suppleness, thickness, changes in hand geometry, and friction at the glove-object interface. Glove research has rarely quantified glove attributes, and often compared gloves of varying material and physical properties. This research had the unique opportunity to control for a number of these properties by using three sets of identical gloves (powerline maintainers? insulating rubber gloves), differing only in thickness. Administering the Von Frey Hair Test indicated that the gloves did indeed decrease tactile sensitivity. This research showed that increasing glove thickness led to large decreases in maximum power grip force. Small changes in hand geometry, such as increased interdigital space or grip span, affected force output. In the same hand posture, participants increased their grip force with increasing glove thickness for the object lifting task but were able to maintain a fixed submaximal force with visual feedback. The decrease in tactile sensitivity is a likely cause of this difference. Muscular activity was affected by wearing the gloves while performing manual tasks. Inconsistent responses of muscular activation were seen in gloved maximum grip effort, while overall increases in electromyographic activity were recorded for tasks at submaximal levels when wearing gloves. Interdigital spacing had different effects on maximal and submaximal tasks. For maximum effort power grip, interdigital spacing decreased force output by as much as 10%, with no significant changes in muscle activation. For submaximal tasks, no significant differences were seen in muscular activity or in force output. The overall force capability of the gloved user is hindered by changes in interdigital spacing at near maximal effort, but does not appear to be for tasks requiring lower grip force, such as the lifting task which required roughly 20%MVC. Overall, the effect of wearing these gloves on the users, the powerline maintainers, is a substantially increased effort to work. This research contributes to a greater understanding of why and how gloves inhibit performance.

Subjects/Keywords: Kinesiology and Sport; biomechanics; gloves; power grip; force; emg

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Willms, K. (2006). An examination of glove attributes and their respective contributions to force decrement and increased effort in power grip at maximal and submaximal levels. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/2800

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Willms, Kirsten. “An examination of glove attributes and their respective contributions to force decrement and increased effort in power grip at maximal and submaximal levels.” 2006. Thesis, University of Waterloo. Accessed February 25, 2021. http://hdl.handle.net/10012/2800.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Willms, Kirsten. “An examination of glove attributes and their respective contributions to force decrement and increased effort in power grip at maximal and submaximal levels.” 2006. Web. 25 Feb 2021.

Vancouver:

Willms K. An examination of glove attributes and their respective contributions to force decrement and increased effort in power grip at maximal and submaximal levels. [Internet] [Thesis]. University of Waterloo; 2006. [cited 2021 Feb 25]. Available from: http://hdl.handle.net/10012/2800.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Willms K. An examination of glove attributes and their respective contributions to force decrement and increased effort in power grip at maximal and submaximal levels. [Thesis]. University of Waterloo; 2006. Available from: http://hdl.handle.net/10012/2800

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Florida

3. Duker, Katherine Elizabeth. Visual Target Increases Maximum Volitional Grip Force Production Poststroke.

Degree: MS, Applied Physiology and Kinesiology, 2018, University of Florida

URL: https://ufdc.ufl.edu/UFE0052814 

Subjects/Keywords: measurement-error; mvc; power-grip; stroke; visual-target

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Duker, K. E. (2018). Visual Target Increases Maximum Volitional Grip Force Production Poststroke. (Masters Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0052814

Chicago Manual of Style (16th Edition):

Duker, Katherine Elizabeth. “Visual Target Increases Maximum Volitional Grip Force Production Poststroke.” 2018. Masters Thesis, University of Florida. Accessed February 25, 2021. https://ufdc.ufl.edu/UFE0052814.

MLA Handbook (7th Edition):

Duker, Katherine Elizabeth. “Visual Target Increases Maximum Volitional Grip Force Production Poststroke.” 2018. Web. 25 Feb 2021.

Vancouver:

Duker KE. Visual Target Increases Maximum Volitional Grip Force Production Poststroke. [Internet] [Masters thesis]. University of Florida; 2018. [cited 2021 Feb 25]. Available from: https://ufdc.ufl.edu/UFE0052814.

Council of Science Editors:

Duker KE. Visual Target Increases Maximum Volitional Grip Force Production Poststroke. [Masters Thesis]. University of Florida; 2018. Available from: https://ufdc.ufl.edu/UFE0052814

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