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Bilateral theta-burst TMS to influence global gestalt perception
Bernd Ritzinger1, Elisabeth Huberle, Hans-Otto Karnath
1Division of Neuropsychology, Center of Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Germany.
Plos One
|October 31, 2012
Summary
Global Gestalt perception relies on the temporo-parietal junction (TPJ). Bilateral stimulation of the TPJ in healthy individuals impaired global visual scene processing, confirming its role.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Visual Perception
Background:
- Object recognition involves the ventral visual pathway, but global scene perception mechanisms are debated.
- Simultagnosia, a deficit in perceiving global scenes, often results from temporo-parietal junction (TPJ) lesions.
Purpose of the Study:
- To investigate the role of the temporo-parietal junction (TPJ) in human global Gestalt perception.
- To determine if TPJ involvement in global perception is bilateral.
Main Methods:
- Continuous theta-burst transcranial magnetic stimulation (TMS) applied unilaterally or bilaterally over the TPJ.
- Healthy participants viewed hierarchically organized visual stimuli with parametrically degraded global information.
Main Results:
- Bilateral TPJ stimulation significantly impaired the identification of global Gestalt.
- Unilateral TPJ stimulation did not significantly affect global perception.
Conclusions:
- The temporo-parietal junction (TPJ) is crucial for human global Gestalt perception.
- Global visual scene processing is dependent on the coordinated function of both TPJ hemispheres.
