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Multi-target attention and visual short-term memory capacity are closely linked in the intraparietal sulcus
Maren Praß1, Bianca de Haan1,2
1Division of Neuropsychology, Center of Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.
Human Brain Mapping
|May 7, 2019
Summary
The right intraparietal sulcus (IPS) is crucial for visual short-term memory capacity, impacting multi-target attention. Disrupting the right IPS reduced memory capacity but did not cause extinction-like symptoms in healthy individuals.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
- Human Attention
Background:
- The right intraparietal sulcus (IPS) and right temporo-parietal junction (TPJ) are implicated in multi-target attention.
- The specific roles of the right IPS and TPJ in multi-target attention remain unclear.
- Extinction is a condition characterized by the failure of multi-target attention.
Purpose of the Study:
- To investigate the distinct roles of the right IPS and TPJ in multi-target attention.
- To examine the effects of disrupting these regions on visual attention and memory capacity.
Main Methods:
- Combined the theory of visual attention (TVA) with functional magnetic resonance imaging (fMRI) guided continuous theta burst stimulation (cTBS).
- Applied cTBS to neurologically healthy subjects targeting the right IPS and right TPJ.
- Assessed changes in TVA parameters and extinction-like behavior.
Main Results:
- Continuous theta burst stimulation (cTBS) over the right IPS reduced visual short-term memory capacity.
- The right IPS appears involved in general capacity-limited encoding mechanisms for attention and memory.
- cTBS over the right IPS did not induce extinction-like behavior.
- cTBS over the right TPJ did not alter TVA parameters or cause extinction-like behavior.
Conclusions:
- The right IPS plays a role in the capacity-limited encoding mechanisms underlying multi-target attention and memory.
- Different subregions of the right IPS may contribute uniquely to multi-target attention.
- The right TPJ's role in multi-target attention and extinction requires further investigation.
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