Fading-figure tracing in Williams syndrome

Area of Science:

• Neurodevelopmental Disorders
• Cognitive Psychology
• Human Visual Perception

Background:

• Williams syndrome (WS) is a genetic disorder impacting cognitive and visuospatial development.
• Visuospatial deficits are a hallmark of WS, yet figure-drawing abilities remain underexplored.
• Figure drawing is a complex task reflecting visuospatial processing and fine motor skills.

Purpose of the Study:

• To investigate and compare figure-drawing abilities in individuals with Williams syndrome (WS) and typically developing (TD) children.
• To identify specific visuospatial processing differences that contribute to drawing difficulties in WS.

Main Methods:

• A fading-figure tracing task was administered to two groups: individuals with WS (mean age 16 years) and TD children (5-6 years).
• Performance was assessed based on successful tracing of geometric figures that gradually disappeared from a screen.
• Analysis focused on the impact of fading time and figure complexity (number of angles, open vs. closed figures) on tracing accuracy.

Main Results:

• Typically developing children showed significant performance improvement with longer fading times, while WS individuals did not.
• TD children struggled with figures exceeding six angles, whereas WS individuals performed poorly on figures with more than five angles.
• WS individuals demonstrated relatively better performance on open figures compared to closed figures, unlike TD children.

Conclusions:

• Drawing disabilities in WS may stem from a reduced visuospatial span, linked to underdeveloped visual scanning.
• Disproportionate development of global processing in WS contributes to specific figure-drawing deficits.
• These findings highlight distinct visuospatial processing patterns in WS affecting drawing capabilities.