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A Novel Approach for Documenting Phosphenes Induced by Transcranial Magnetic Stimulation
Published on: April 1, 2010
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Occipital TMS at phosphene detection threshold captures attention automatically.
Dragan Rangelov1, Hermann J Müller2, Paul C J Taylor1
1Department of Psychology, Ludwig-Maximilians-Universität München, Leopolstr. 13, München DE-80802, Germany.
Neuroimage
|January 21, 2015
Summary
Attentional capture can occur without subcortical processing, challenging existing models. Both external stimulus features and internal brain states significantly influence how attention is captured.
Area of Science:
- Cognitive Neuroscience
- Visual Attention
Background:
- Attentional selection is often assumed to be driven by physical stimulus properties.
- The precise neural mechanisms of attentional capture, particularly the role of subcortical pathways, remain debated.
Purpose of the Study:
- To investigate the necessity of subcortical feedforward processing for attentional capture.
- To determine if internal nervous system states modulate attentional capture strength.
Main Methods:
- Utilized transcranial magnetic stimulation (TMS) over the occipital visual cortex to disrupt visual processing.
- Compared attentional capture by cued stimuli presented with and without subcortical feedforward input.
- Investigated the effect of stimulus visibility on capture strength.
Main Results:
- Demonstrated robust attentional capture even when feedforward input to subcortical structures like the superior colliculus was disrupted.
- Showed that seen cues captured attention more effectively than physically identical unseen cues.
- Evidence suggests that the internal state of the nervous system influences attentional selection.
Conclusions:
- The feedforward sweep through subcortex is not essential for attentional capture but serves as an additional contributing factor.
- Attentional capture is influenced by multiple sources, including both stimulus-driven and internally modulated factors.
- Momentary neural states play a crucial role in modulating attentional selection.
