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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
Published on: January 23, 2017
Time course of visual attention across perceptual levels and objects
Priyanka Srivastava1, Devpriya Kumar, Narayanan Srinivasan
1Centre of Behavioral and Cognitive Sciences, University of Allahabad, India.
Acta Psychologica
|October 13, 2010
Summary
Visual attention shifts between global and local processing levels are influenced by the scope of attention. Shifting attention between objects at the same perceptual level is more efficient than shifting between different levels.
Area of Science:
- Cognitive Psychology
- Visual Perception
- Attention Studies
Background:
- Existing theories of visual attention, such as attentional blink and dwell time, do not fully explain attention shifts across different perceptual levels (global vs. local) involving multiple objects.
- Understanding how attention shifts between hierarchical levels of visual stimuli is crucial for a comprehensive model of visual attention.
Purpose of the Study:
- To investigate the dynamics of visual attention shifts between global and local processing levels using the attentional dwell time paradigm.
- To determine how the scope of attention (global vs. local) and the relationship between successive targets affect the efficiency of attentional shifts.
Main Methods:
- Two experiments utilized the attentional dwell time paradigm with compound stimuli presented at varying stimulus onset asynchronies (SOAs).
- Participants identified two successive targets at either the global or local level, with target locations fixed in Experiment 1 and variable in Experiment 2.
Main Results:
- Attentional shifts were more efficient when both targets were processed at the same perceptual level (global or local) compared to different levels.
- Identifying a local target followed by a global target proved difficult at short SOAs, suggesting processing level interactions.
- Global processing appears to allow for more simultaneous, distributed attention with fewer capacity limitations.
Conclusions:
- The scope of visual attention significantly impacts the temporal course of attention, influencing processing efficiency.
- Attention may default to a distributed state, becoming focused for specific target identification.
- Distinct mechanisms likely govern shifts in focused attention across locations versus changes in attentional set required for different perceptual levels.
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