The allocation of attention and working memory in visual crowding

Area of Science:

• Cognitive Neuroscience
• Visual Perception

Background:

• Crowding, a decline in visual target discrimination due to nearby flankers, is thought to involve selective attention.
• Previous research explored attention's effect on crowding but not how attentional allocation changes with target-flanker distance.

Purpose of the Study:

• To investigate how attentional allocation varies with target-flanker distance during visual crowding.
• To test the hypothesis that attention fails at critically small target-flanker distances.

Main Methods:

• Utilized event-related potentials (ERPs), specifically the N2pc and sustained posterior contralateral negativity (SPCN) components.
• Employed a crowding task where participants identified a central target letter flanked by distractors at varying distances.

Main Results:

• N2pc amplitude, reflecting attention, was maximal at intermediate distances and decreased significantly in severe crowding.
• SPCN amplitude, reflecting working memory, increased at small distances, indicating information storage when attention failed.

Conclusions:

• Attention effectively minimizes flanker interference at intermediate distances.
• Working memory appears to be recruited to process information when attention fails at very small target-flanker distances in crowding.