[Role of connectedness in early object-based attentional selection]

Area of Science:

• Cognitive Neuroscience
• Visual Perception

Context:

• Understanding how the brain forms perceptual groups is key to understanding attention.
• Previous research highlighted uniform connectedness and feature similarity as grouping principles.
• The interplay between these factors in early attention is not fully understood.

Purpose:

• To investigate the independent and combined effects of connectedness and boundary-feature similarity on early spatial selection.
• To examine how these grouping factors influence attentional selection using event-related potentials (ERPs).

Summary:

• Participants performed a sustained-focal-attention task with stimuli varying in connectedness (C-, C+) and boundary-feature similarity (S-, S+).
• Event-related potentials (ERPs) revealed that both connectedness and feature similarity reduced the N1 attention effect (125-185 ms).
• The influence of connectedness and feature similarity on early attention was found to be independent.

Impact:

• Suggests that multiple grouping factors, including connectedness and feature similarity, operate in parallel during early object-based attention.
• Provides evidence for parallel processing of grouping cues in early visual attention.
• Advances understanding of the fundamental mechanisms underlying attentional selection and visual grouping.