Neuroimaging Clinical Trial
Official title:
Lexical Tone Perception in Tone Language speakers--a fMRI Study
Tone language refers to a language that uses fixed pitch pattern to distinguish words (Yip, 2002). Understanding the functional anatomy of the brain during lexical tone processing will provide useful hints for an effective intervention strategy such as brain stimulation. The present study investigate the cortical organisation of the brain in lexical tone perception of Cantonese speakers by the use of functional magnetic resonance imaging (fMRI).
Tone language refers to a language that uses fixed pitch pattern to distinguish words (Yip,
2002). Cantonese is one of the main tone languages spoken by over 70 million around the world
(Li et al.,1995; Adolfsson, 2010). Individuals with significant hearing impairment often
present great difficulty in tone perception, affecting their understanding of words and
hence, hamper their overall communication. The poor tone perception persists even with
intensive auditory training coupled with advanced hearing technology such as cochlear
implants.
Understanding the functional anatomy of the brain during lexical tone processing will provide
useful hints for an effective intervention strategy such as brain stimulation. Researchers
have been investigating the neural basis for tone perception in the past decades but failing
to come to a consensus on the location of the brain that is responsible for lexical tone
processing. The discrepant results may be due to the fact of the differences in subject
selection (animals, healthy adults, brain-injured patients, tonal-language and non-tonal
language speakers), testing materials and tasks employed (linguistic versus non-linguistic
stimuli; dichotic listening versus discrimination and identification tasks) and outcome
measurements (performance score, reaction time, accuracy rate, PET scan and fMRI).
Cortical organization, or brain mapping, refers to functional anatomy of the brain. The
present study is the first study to systematically investigate the cortical organization of
the brain in lexical tone perception of Cantonese speakers by the use of functional magnetic
resonance imaging (fMRI). A comprehensive set of auditory stimuli specifically for
investigating the different levels of lexical tone processing will be constructed. Native
Cantonese speakers with normal hearing were recruited. They underwent fMRI while listening to
the carefully designed auditory stimuli.
Once the cortical organization of lexical tone processing in Cantonese is identified, the
valuable findings could be applied in further brain intervention procedures to tackle the
long lasting, unresolved tone perception difficulty encountered by people with hearing
impairment or other related disorders.
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