Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

How visual feedback affects movements

Wu, Sai-Kit (2009) How visual feedback affects movements. Master's Thesis, University of Pittsburgh. (Unpublished)

Primary Text

Download (4MB) | Preview


Monkeys were well trained to perform a variety of point-to-point reaching movements in virtual reality. We systematically varied the timing and location of the visualized hand position to study the way that visual feedback is used during the initial phase of reaching. The results showed that the monkey learned a discrete strategy based on the information from vision of the hand during the reach. This information was used in a different phase of the task after a stereotypic processing delay to reach the target correctly. Here, I demonstrate that reaching movement was affected by a gradual and orderly changed flash distance (at which point the flash was shown), but it was not affected when the order of the flash distance was randomly assigned. This suggested that the flash could not create a clear effect to the reaching every time. Second, I have show that a misplaced location of flash could not make the hand produce the hypothetical adjustment which counterbalanced the perceived error. This suggested that the flash had to contain correct information in order to be used by the monkey. Finally, I showed that the monkey was able to utilize the flash in the spatial rotation center-out task (the flash was displaced to either side of its proper location). This paper provides a novel behavior task for monkeys' movement correction experiment, and it is a useful tool to achieve the long-term goals of understanding the connection between M1 neurons and early correction stimulus.


Social Networking:
Share |


Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Wu, Sai-Kitsaw61@pitt.eduSAW61
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairSchwartz, Andrew
Committee MemberWeber, Douglas
Committee MemberZeringue, Henry
Committee MemberCui, Tracy
Date: 28 January 2009
Date Type: Completion
Defense Date: 1 December 2008
Approval Date: 28 January 2009
Submission Date: 1 December 2008
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Bioengineering
Degree: MSBeng - Master of Science in Bioengineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: feedback; movement
Other ID:, etd-12012008-181723
Date Deposited: 10 Nov 2011 20:07
Last Modified: 15 Nov 2016 13:52


Monthly Views for the past 3 years

Plum Analytics

Actions (login required)

View Item View Item