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Neural substrates of phonemic perception.
Einat Liebenthal1, Jeffrey R Binder, Stephanie M Spitzer
1Department of Neurology, Medical College of Wisconsin, Milwaukee, WI 53226, USA. einatl@mcw.edu
Cerebral Cortex (New York, N.Y. : 1991)
|February 11, 2005
Summary
The left middle/anterior superior temporal sulcus (STS) is crucial for processing familiar speech sounds, distinguishing them from non-speech patterns. This brain region plays a key role in phonemic perception.
Area of Science:
- Neuroscience
- Auditory Perception
- Speech Processing
Background:
- The temporal lobe, particularly the left hemisphere, is known for speech sound perception.
- Specific roles of distinct temporal lobe regions in speech signal analysis remain unclear.
Purpose of the Study:
- To investigate the precise function of different temporal lobe regions in analyzing the speech signal.
- To identify specific brain areas involved in phonemic perception.
Main Methods:
- Auditory discrimination task comparing responses to familiar consonant-vowel syllables and complex nonphonemic sounds.
- Functional neuroimaging to measure brain activity in response to auditory stimuli.
Main Results:
- The left middle and anterior superior temporal sulcus (STS) showed greater responsiveness to familiar speech syllables compared to nonphonemic patterns.
- Bilateral dorsal superior temporal gyrus areas, near primary auditory cortex, responded similarly to both phonemic and nonphonemic sounds.
Conclusions:
- The left middle/anterior STS is critical for phonemic perception.
- This region may serve as an intermediate processing stage, connecting auditory feature analysis to higher-level linguistic processing areas.