Saccade dysmetria in Williams-Beuren syndrome

Area of Science:

• Neuroscience
• Developmental Psychology
• Ophthalmology

Background:

• Williams-Beuren syndrome (WBS) is a genetic disorder associated with cognitive deficits.
• Previous research indicates challenges in visuo-spatial processing for individuals with WBS.
• The relationship between visual perception and eye movement control is well-established.

Purpose of the Study:

• To investigate the hypothesis that poor visuo-spatial processing in WBS is linked to impaired saccadic eye movement control.
• To quantify saccadic eye movement characteristics in subjects with WBS.

Main Methods:

• Infrared video-oculography was used to record horizontal and vertical saccadic eye movements.
• The study included 27 subjects with WBS and 8 healthy controls.
• Eye movements were elicited by visual targets.

Main Results:

• Subjects with WBS displayed highly variable saccadic gains, both between and within individuals.
• WBS subjects frequently required multiple correction saccades to reach targets.
• A significant number of WBS subjects exhibited hypometric or hypermetric saccades and left-right asymmetry in saccadic gains.

Conclusions:

• Impaired saccadic control is evident in individuals with Williams-Beuren syndrome.
• These saccadic abnormalities are likely contributors to the visuo-spatial processing deficits observed in WBS.
• Understanding these oculomotor deficits offers insights into the broader cognitive profile of WBS.