Related Experiment Videos
Interactions between task difficulty and hemispheric distribution of attended locations: implications for the
Antje Kraft1, Notger G Müller, Herbert Hagendorf
1Department of Neurology, Charité, Berlin NeuroImaging Center, Schumannstr. 20-21, D-10117 Berlin, Germany.
Brain Research. Cognitive Brain Research
|June 1, 2005
Summary
Attention can be split across visual space, especially in difficult tasks. This study suggests a modified model where hemispheres control simultaneous attentional foci, resolving debate in attention research.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Attention Research
Background:
- The ability to divide attention across multiple spatial locations simultaneously is a contentious topic in attention research.
- Previous studies have not fully accounted for the interplay between target distribution and task difficulty.
Purpose of the Study:
- To investigate whether attention can be split simultaneously across different spatial regions.
- To resolve the debate on attentional splitting by considering target hemifield distribution and task difficulty.
Main Methods:
- Five experiments were conducted with 48 participants comparing the identity of two out of four stimuli.
- Task difficulty and the spatial arrangement of targets (adjacent vs. separated within or across hemifields) were manipulated.
Main Results:
- In easy tasks, adjacent targets within a hemifield yielded better performance than separated ones, but performance across hemifields was similar.
- Difficult tasks showed a bilateral advantage for separated stimuli across hemifields.
- Increasing task difficulty reduced the performance difference between adjacent and separated targets within a hemifield.
Conclusions:
- The findings support the possibility of splitting visual attention simultaneously across multiple spatial regions.
- A modified model of visuo-spatial attention is proposed, enabling hemispheres to manage concurrent attentional foci.