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Related Experiment Video

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Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia

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Inhibitory TMS over Visual Area V5/MT Disrupts Visual Speech Recognition.

Lisa Jeschke¹, Brian Mathias², Katharina von Kriegstein³

¹Chair of Cognitive and Clinical Neuroscience, Faculty of Psychology, Technische Universität Dresden, 01069 Dresden, Germany lisa.jeschke@tu-dresden.de.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|October 17, 2023

Summary

The visual medial temporal area (V5/MT) is crucial for recognizing both simple motion and complex visual speech. Disrupting V5/MT with transcranial magnetic stimulation (TMS) impaired speech recognition, challenging previous notions of separate motion processing pathways.

Keywords:

TMS V5/MT motion recognition visual speech

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Published on: March 24, 2023

Area of Science:

Neuroscience
Cognitive Science
Visual Perception

Background:

Facial movements in communication aid speech comprehension.
The visual medial temporal area (V5/MT) is known for processing nonbiological motion.
V5/MT's role in biological motion, like visual speech, is debated.

Purpose of the Study:

To investigate the causal role of V5/MT in visual speech recognition.
To challenge the dichotomy between processing simple nonbiological and complex biological motion.
To explore V5/MT's influence on motion and speech perception.

Main Methods:

Neuronavigated offline transcranial magnetic stimulation (TMS) applied to V5/MT.
Comparison of TMS effects on V5/MT versus a control vertex region.
Measurement of response times in simple motion and visual speech recognition tasks.

Main Results:

TMS over V5/MT increased response times for both simple motion and visual speech recognition.
V5/MT stimulation reduced practice effects typically seen in these tasks.
This suggests V5/MT is causally involved in visual speech perception.

Conclusions:

Area V5/MT causally influences visual speech recognition.
Findings challenge the strict separation of neural pathways for different motion types.
Provides insights into the neural basis of human communication perception.