ESTABLISHING NORMATIVE EYE MOVEMENT PATTERNS ......Title GRH Spotlight on Research Breakfast Poster...
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Background Ewen B. Lavoie 1 , BSc., Elizabeth A. Crockett 1 , BSc., Ognjen Kovic 1 , Aida M. Valevicius 2 , MSc., Quinn A. Boser 2 , BEng., Patrick M. Pilarski 3 , PhD., Albert H. Vette 2 , PhD., Jacqueline S. Hebert 3 , MD FRCPC, & Craig S. Chapman 1 , PhD. 1 Faculty of Physical Education and Recreation, 2 Department of Biomedical Engineering, 3 Division of Physical Medicine and Rehabilitation, University of Alberta ESTABLISHING NORMATIVE EYE MOVEMENT PATTERNS IN UPPER-LIMB FUNCTIONAL TASKS Results Conclusions Advancements in Upper-limb Prostheses • Multiple degrees of freedom • Software integration • Multiple inputs for control References [1] Hebert, J.S., et al. (2014) IEEE Trans. Neural Syst. Rehabil. Eng. 22(4): 765-773. [2] Biddiss, E.A., & Chau T.T. (2007) Prosth. Orth. Int. 31: 236-257. 4-280 Van Vliet Centre, University of Alberta, 116 St & 85 Ave, Edmonton AB, T6G 2R3 Contact: [email protected] 1. When moving objects in sequence, able-bodied individuals exhibit prominent look-ahead fixations 2. Able-bodied individuals spend little, if any, time fixating on their own hand 3. Prosthetic users do not exhibit strong look-ahead fixations, and spend significant time fixating on their terminal device, especially during object transport Reinnervation Surgeries Complete data collection from prosthetic users, including some with increased sensory feedback from specialized prostheses Data collection from able-bodied participants using a specialized sensorimotor bypass prosthesis Potential data collection from individuals experiencing other sensorimotor neurological deficits Future Directions Objectives Long-term • Use limb and eye tracking technologies to provide a more sensitive measure of prosthetic limb use with and without sensory feedback [4] Current project • Establish normative eye tracking data from able-bodied subjects on 2 functional tasks • Simple enough to gather data from • Complex enough to emulate day-to-day movements Supplementary project • Preliminary comparison of eye movements of prosthetic users to those of able-bodied participants Current Evaluation Procedures • Box and Blocks [3] • Fails to give robust information • Clinical assessments • Expensive, inconsistent, time intensive Upper-limb Prostheses Rejection Rates • Passive 39% • Body-powered 26% • Myoelectric 23% [2] Methods Equipment • Binocular 60 Hz mobile Eye-tracker Cups Pasta 1. Eye tracking Only 2. Motion tracking Only 3. Both eye and motion tracking SCENE CAMERA PUPIL CAMERAS • Synchronization of eye and motion tracking systems • Enables segmentation of eye data by phase of movement • 120 Hz Motion tracker with 12 IR cameras Participants • 20 able-bodied (complete) • 6 prosthetic users (in progress) Protocol • 20 repetitions of 2 daily living tasks under 3 conditions (120 trials) Normative Eye Behavior Prosthetic user n=20 Able bodied Time (s) Fixation Location vs Time during Cups Task Current Location Other Segments Future Location Prosthetic User Eye Behavior Normative vs Prosthetic User Eye Behavior This work was sponsored by the Defense Advanced Research Projects Agency (DARPA) BTO under the auspices of Dr. Doug Weber through the [Space and Naval Warfare Systems Center, Pacific OR DARPA Contracts Management Office] Grant/Contract No. N66001-15-C-4015. Look-ahead Fixations Grasp Release Grasp and Transport Release 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 Release Transport Grasp Reach Cups Task - Normalized Fixation Time (%) Current Future Hand [1] [3] Mathiowetz V., et al. (1985) Amer. J. Occ. Ther. 39: 386-391. [4] Sobuh, M., et al. (2014) J. Neuroeng. Rehabil. 11: 1-11.
Transcript of ESTABLISHING NORMATIVE EYE MOVEMENT PATTERNS ......Title GRH Spotlight on Research Breakfast Poster...
Background
Ewen B. Lavoie1, BSc., Elizabeth A. Crockett1, BSc., Ognjen Kovic1, Aida M. Valevicius2, MSc., Quinn A. Boser2, BEng., Patrick M. Pilarski3, PhD., Albert H. Vette2, PhD., Jacqueline S. Hebert3, MD FRCPC, & Craig S. Chapman1, PhD.
1Faculty of Physical Education and Recreation, 2Department of Biomedical Engineering, 3Division of Physical Medicine and Rehabilitation, University of Alberta
ESTABLISHING NORMATIVE EYE MOVEMENT PATTERNS IN UPPER-LIMB FUNCTIONAL TASKS
Results
Conclusions
Advancements in Upper-limb Prostheses • Multiple degrees of freedom • Software integration • Multiple inputs for control
References [1] Hebert, J.S., et al. (2014) IEEE Trans. Neural Syst. Rehabil. Eng. 22(4): 765-773. [2] Biddiss, E.A., & Chau T.T. (2007) Prosth. Orth. Int. 31: 236-257.
4-280 Van Vliet Centre, University of Alberta, 116 St & 85 Ave, Edmonton AB, T6G 2R3
Contact: [email protected]
1. When moving objects in sequence, able-bodied individuals exhibit prominent look-ahead fixations 2. Able-bodied individuals spend little, if any, time fixating on their own hand
3. Prosthetic users do not exhibit strong look-ahead fixations, and spend significant time fixating on their terminal device, especially during object transport
Reinnervation Surgeries
Complete data collection from prosthetic users, including some with increased sensory feedback from specialized prostheses Data collection from able-bodied participants using a specialized sensorimotor bypass prosthesis
Potential data collection from individuals experiencing other sensorimotor neurological deficits
Future Directions
Objectives Long-term • Use limb and eye tracking technologies to provide a more sensitive
measure of prosthetic limb use with and without sensory feedback [4]
Current project • Establish normative eye tracking data from able-bodied subjects
on 2 functional tasks • Simple enough to gather data from • Complex enough to emulate day-to-day movements
Supplementary project • Preliminary comparison of eye movements of prosthetic users to
those of able-bodied participants
Current Evaluation Procedures • Box and Blocks [3]
• Fails to give robust information • Clinical assessments
• Expensive, inconsistent, time intensive
Upper-limb Prostheses Rejection Rates • Passive 39% • Body-powered 26% • Myoelectric 23% [2]
Methods Equipment • Binocular 60 Hz mobile Eye-tracker
Cups Pasta 1. Eye tracking Only
2. Motion tracking Only 3. Both eye and motion tracking
SCENE CAMERA
PUPIL CAMERAS
• Synchronization of eye and motion tracking systems • Enables segmentation of eye data by phase of movement
• 120 Hz Motion tracker with 12 IR cameras
Participants • 20 able-bodied (complete) • 6 prosthetic users (in progress) Protocol • 20 repetitions of 2 daily living tasks under 3 conditions (120 trials)
Normative Eye Behavior
Pros
thet
ic
user
n=
20 A
ble
bodi
ed
Time (s)
Fixation Location vs Time during Cups Task
Cur
rent
Lo
catio
n
Other
Segments
Futu
re
Loca
tion
Prosthetic User Eye Behavior
Normative vs Prosthetic User Eye Behavior
This work was sponsored by the Defense Advanced Research Projects Agency (DARPA) BTO under the auspices of Dr. Doug Weber through the [Space and Naval Warfare Systems Center, Pacific OR DARPA Contracts Management Office] Grant/Contract No. N66001-15-C-4015.
Look-ahead Fixations Grasp Release
Grasp and Transport Release
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00
Release
Transport
Grasp
Reach
Cups Task - Normalized Fixation Time (%)
Current Future Hand
[1]
[3] Mathiowetz V., et al. (1985) Amer. J. Occ. Ther. 39: 386-391. [4] Sobuh, M., et al. (2014) J. Neuroeng. Rehabil. 11: 1-11.
