The extrastriate symmetry response is robust to variation in visual memory load

Area of Science:

• Cognitive Neuroscience
• Visual Perception
• Electrophysiology

Background:

• The Sustained Posterior Negativity (SPN) is an event-related potential linked to visual symmetry processing.
• Previous research indicates SPN generation is independent of task relevance and attention.
• The impact of concurrent memory load on SPN has not been previously investigated.

Purpose of the Study:

• To determine if visual working memory (VWM) load interferes with the SPN response to visual symmetry.
• To assess the robustness of the symmetry perception neural correlate under cognitive load.

Main Methods:

• Two experiments were conducted with participants performing visual symmetry perception tasks.
• Participants engaged in either a passive viewing task or a visual working memory task with varying loads (colors, shapes, or symmetry patterns).
• Event-related potentials, specifically the SPN, were recorded and analyzed.

Main Results:

• Contrary to predictions, VWM load did not impair the SPN response to visual symmetry.
• The SPN was generally enhanced during memory tasks compared to passive viewing conditions.
• This enhancement occurred irrespective of whether memory items were colors, shapes, or symmetry patterns themselves.

Conclusions:

• The neural response to visual symmetry (SPN) is resilient to interference from concurrent visual working memory tasks.
• Symmetry perception appears to be an automatic process, unaffected by attention or memory demands.
• These findings support the view that symmetry processing is a robust and automatic cognitive function.