Person:
Wheaton, Lewis A.

Permanent Link
https://hdl.handle.net/1853/71831
Associated Organization(s)
Organizational Unit
ORCID
ArchiveSpace Name Record

Filters

2021 - 2022 4
4
3 1
4
Reset filters

Settings
Author: Johnson, John T. ×

Publication Search Results

Now showing 1 - 4 of 4
  • No Thumbnail Available
    Item
    Grasp Posture Variability Leads to Greater Ipsilateral Sensorimotor Beta Activation during Prosthesis Use Data
    (Georgia Institute of Technology, 2022) Alterman, Bennett L. ; Ali, Saif ; Keeton, Emily ; Binkley, Katrina ; Hendrix, William ; Lee, Perry J. ; Johnson, John T. ; Wang, Shuo ; Kling, James ; Gale, Mary Kate ; Wheaton, Lewis A.
  • No Thumbnail Available
    Item
    Alpha-Band Activity in Left Motor Cortex Predicts Future Availability of Vibrotactile Feedback in Prosthesis Use (Obsolete)
    (Georgia Institute of Technology, 2021) Johnson, John T. ; Gavetti De Mari, Daniele ; Doherty, Harper ; Hammond III, Frank L. ; Wheaton, Lewis A.
    See replacement item: http://hdl.handle.net/1853/66286
  • Thumbnail Image
    Item
    Alpha-Band Activity in Parietofrontal Cortex Predicts Future Availability of Vibrotactile Feedback in Prosthesis Use
    (Georgia Institute of Technology, 2021) Johnson, John T. ; Gavetti De Mari, Daniele ; Doherty, Harper ; Hammond III, Frank L. ; Wheaton, Lewis A.
    Prosthesis disuse and abandonment is an ongoing issue in upper-limb amputation. In addition to lost structural and motor function, amputation also results in decreased task-specific sensory information. One proposed remedy is augmenting somatosensory information using vibrotactile feedback to provide tactile feedback of grasping objects. While the role of frontal and parietal areas in motor tasks is well established, the neural and kinematic effects of this augmented vibrotactile feedback remain in question. In this study, we sought to understand the neurobehavioral effects of providing augmented feedback during a reach-grasp -transport task. Ten persons with sound limbs performed a motor task while wearing a prosthesis simulator with and without vibrotactile feedback. We hypothesized that providing vibrotactile feedback during prosthesis use would increase activity in frontal and parie tal areas and improve grasp-related behavior. Results show that anticipation of upcoming vibrotactile feedback may be encoded in motor and parietal areas during the reach-to-grasp phase of the task. While grasp aperture is unaffected by vibrotactile feedback, the availability of vibrotactile feedback does lead to a reduction in velocity during object transport. These results help shed light on how engineered feedback is utilized by prostheses users and provide methodologies for further assessment in advanced prosthetics research.
  • No Thumbnail Available
    Item
    Partial-Hand Prosthesis Users Show Improved Reach-to-Grasp Behaviour Compared to Transradial Prosthesis Users with Increased Task Complexity
    (Georgia Institute of Technology, 2021) Wheaton, Lewis A. ; Alterman, Bennett L. ; Keeton, Emily ; Ali, Saif ; Binkley, Katrina ; Hendrix, William ; Lee, Perry J. ; Wang, Shuo ; Johnson, John T.
    Purpose: Approaches to improve outcomes after upper-extremity amputation remain poorly understood. Different levels of amputation may affect prosthetic device acceptance, function, and use. Examining differences in behavioural and functional performance for different levels of prosthesis use may provide vital information about unique motor control challenges across levels of amputation. Materials and methods: Participants without amputation completed simple and complex goal-directed reach-to-grasp motor actions using either a transradial or partial-hand prosthesis simulator. We hypothesised that participants using a partial-hand device would show greater functional adaptation compared to participants using a transradial device, measured by (1) lower movement duration, (2) lower reach duration, (3) higher reach peak velocity, and (4) lower placement error. Second, we hypothesised that increased task complexity would lead to greater functional adaptation, particularly in partial-hand users. Results: In the complex task, partial-hand users demonstrated variable grasp approaches, an effect not seen in the simple task or in transradial users. Partial-hand users showed significantly higher reach peak velocities compared to transradial users, regardless of grasp strategy in the complex but not the simple task. All groups showed decreases in movement duration over time in the complex task, but only partial-hand users improved in the simple task. Conclusion: There is a gap in our understanding of how people adapt to amputations of different levels. This work clarifies how device and environmental constraints contribute to unique action outcomes, and influence motor learning, which is crucial for optimising rehabilitation.