Abstract Details

Title Spatial-motor "Aiming" and sitting balance with prism adaptation in spatial neglect

Topic Neuro-rehabilitation

Presentation(s) P8 - Poster Session 8 (8:00 AM-9:00 AM)

Poster/Presentation
Number 15-010

Objective To temporally co-track shifts in spatial-motor Aiming bias after left-base wedge prism adaptation, reported in controls (Fortis, Goedert, Barrett, 2011) and stroke survivors with spatial neglect (Fortis, Chen, Goedert, Barrett, 2011), with sitting balance parameters.

Background Left-base optical prism adaptation improves spatial Aiming (leftward directional kinesis). Postural improvements are also reported, however studies have not yet examined whether balance begins to change at the time when Aiming bias moves leftward, or changes later.

Design/Methods

A 76-year old survivor of right posterior cerebral artery stroke, with typical left spatial neglect, completed a ten-session protocol of prism adaptation treatment. We assessed pre- and post-prism treatment, and again three weeks later: (Assessment 1) Aiming and Where with computerized line bisection (Barrett, 2013) and (Assessment2) sitting balance stability and range of sway: the participant faced a visual anchor with arms on her lap, and unsupported, with feet on the floor, she maintained sitting posture for 3 minutes of recording per session. Phase plane analysis computed overall stability from the anterior-posterior and medial-lateral center-of-pressure (CoP); decreased stability is associated with increased CoP variations in displacement, and velocity (Pilkar et al., 2018). We examined the range of measured sway in both anterior-posterior and medial-lateral directions.

Results Assessment 1 revealed expected leftward spatial Aiming bias shift baseline to post-prism treatment (14 mm/-11 mm pre/post). “Wrong-way” (leftward) Where bias was present pre- and post- prisms (-34 mm/ -21 mm). Assessment 2 revealed altered magnitude of balance stability / range of sway indices post-prism treatment, suggesting improvement; both further improved three weeks later, when Aiming bias was rightward (-23 mm Where /13 mm Aiming).

Conclusions Leftward spatial Aiming shift, and reduced “wrong-way” Where bias, could both contribute to balance improvement in spatial neglect after prism adaptation treatment. Future research will seek functional correlates of Aiming bias shifts, “wrong-way” spatial bias and CoP changes.

Authors/Disclosures
A. M. Barrett, MD, F�鶹��ýӳ�� (UMass Memorial) PRESENTER	The institution of Dr. Barrett has received research support from Veterans Health Association. The institution of Dr. Barrett has received research support from National Institutes of Health. The institution of Dr. Barrett has received research support from Mabel H Flory Trust. Dr. Barrett has received personal compensation in the range of $0-$499 for serving as a author, chapter with WebMD. Dr. Barrett has received personal compensation in the range of $10,000-$49,999 for serving as a scientific advisor with Winifred Masterson Burke Foundation.
Peii Chen	No disclosure on file
Peii Chen	No disclosure on file
Andrew Abdou	No disclosure on file

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