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Can subitizing survive the attentional blink? An ERP study
1School of Foreign Languages & Cultures, Nanjing Normal University, Ninghai Road, Nanjing 210097, PR China. 412alix@gmail.com
Neuroscience Letters
|June 17, 2008
Summary
Both subitizing and counting number sets require attention, challenging the idea that subitizing is a pre-attentive process. This attentional demand was measured using event-related potentials (ERPs) during an attentional blink task.
Area of Science:
- Cognitive psychology
- Neuroscience
- Visual perception
Background:
- Subitizing, the rapid enumeration of small quantities, is often considered a pre-attentive process.
- Counting, the enumeration of larger quantities, is known to be attention-demanding.
Purpose of the Study:
- To investigate whether subitizing and counting are attention-demanding processes.
- To determine if these processes are affected by the attentional blink (AB).
Main Methods:
- Event-related potentials (ERPs) were recorded while participants judged the number of dots.
- A dual-task paradigm was used, where the number judgment task was presented during a potential attentional blink.
- A single-task condition served as a control.
Main Results:
- Behavioral accuracy decreased with increasing dot quantity in both subitizing and counting ranges during the dual-task.
- ERPs showed a delayed P3 component in the dual-task condition for both subitizing and counting.
- P3 amplitude was reduced during the attentional blink, equally for subitizing and counting.
Conclusions:
- Both subitizing and counting require attentional resources.
- Subitizing is not a purely pre-attentive process, as it is modulated by attentional load.
- These findings contribute to understanding the cognitive and neural mechanisms of number processing.
