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Eye-tracking to Distinguish Comprehension-based and Oculomotor-based Regressive Eye Movements During Reading
Published on: October 18, 2018
Task-guided selection of the dual neural pathways for reading
Kimihiro Nakamura1, Nobuko Hara, Sid Kouider
1Department of Speech Physiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. kimihiro@m.u-tokyo.ac.jp
Neuron
|November 8, 2006
Summary
This study reveals how the brain processes spoken words from visual input. Transcranial magnetic stimulation (TMS) showed distinct brain regions are involved in word pronunciation versus recognition tasks.
Area of Science:
- Neuroscience
- Cognitive Science
- Psycholinguistics
Background:
- Visual word perception typically activates auditory word representations.
- The neural basis of this phonological activation requires further elucidation.
Purpose of the Study:
- To investigate the neural mechanisms underlying phonological activation during visual word processing.
- To differentiate the roles of the left superior temporal gyrus (L-STG) and inferior parietal lobe (L-IPL) in word processing tasks.
Main Methods:
- Employed transcranial magnetic stimulation (TMS) on the L-STG and L-IPL.
- Utilized a masked priming paradigm with visual and auditory targets.
- Manipulated task demands, including pronunciation and lexical decision.
Main Results:
- Pronunciation priming was abolished by L-IPL stimulation, but not L-STG stimulation.
- Lexical decision priming was abolished by L-STG stimulation, but not L-IPL stimulation.
- Demonstrated a double dissociation between L-STG and L-IPL functions.
Conclusions:
- Task instructions modulate stimulus-driven activation in the lateral temporal cortex (L-STG) for lexico-phonological processing.
- Task instructions modulate activation in the inferior parietal cortex (L-IPL) for spoken word production.
- Different neural networks are engaged for distinct behavioral responses in word processing.
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