Attentional control of spatial scale: effects on self-organized motion patterns

Area of Science:

• Cognitive Neuroscience
• Visual Perception
• Computational Neuroscience

Background:

• Previous research indicates broadly spread attention increases sensitivity to large spatial filters, reducing resolution but enhancing global structure perception.
• Attentional spread is controllable by the perceiver and can extend beyond a single spatial axis.

Purpose of the Study:

• To investigate how attentional spread affects the self-organization of motion patterns in directionally ambiguous visual stimuli.
• To determine if different spatial scales, modulated by attention, lead to qualitatively different motion perceptions.

Main Methods:

• Subjects' attentional states were manipulated to be either narrowly focused or broadly spread.
• Directionally ambiguous, counterphase stimuli (rows of lines/dots) were presented.
• The resulting motion patterns (unidirectional vs. oscillatory) were analyzed in relation to attentional spread and spatial scale.

Main Results:

• Attentional spread was shown to influence the self-organization of motion patterns, leading to distinct outcomes (unidirectional vs. oscillatory) for the same stimulus.
• Qualitatively different motion patterns emerged at different spatial scales, controlled by the degree of attentional spread.
• The findings align with previous observations on attentional spread's effects on spatial resolution.

Conclusions:

• Attentional spread is a critical factor in visual perception, modulating not only spatial resolution but also the emergence of motion patterns.
• A neural model with large, co-operatively interacting receptive fields can account for both spatial resolution and motion perception effects of attentional spread.