Sotaro Sekimoto

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The dichotic presentation of two sinusoids with a slight difference in frequency elicits subjective fluctuations called binaural beat (BB). BBs provide a classic example of binaural interaction considered to result from neural interaction in the central auditory pathway that receives input from both ears. To explore the cortical representation of the(More)
Magnetic brain responses were recorded to clarify the cortical representation of vowel processing in Japanese. We investigated the peak latencies and equivalent current dipoles of the auditory N1m responses to the Japanese vowels [a], [i], [o], and [u]. In intraindividual analyses for a single participant, well-replicated results for the dipole parameters(More)
A 48-year-old woman visited the authors' clinic because of aphonia. Laryngeal fiberscopic examination indicated laryngitis and bronchitis, and the authors recognized glottal incompetence when she tried to phonate. The authors performed a functional magnetic resonance imaging (f-MRI) study on the patient's first visit to their clinic and a second study 35(More)
Humans are the only species known to use whispering for communication, and humans are also the only species known to suffer from functional (psychological) aphonia, a condition in which only whispered and not vocalized speech can be produced. Thus, whispering is uniquely a human function and psychological aphonia is uniquely a human dysfunction; both can be(More)
We have developed a special purpose adaptor making it possible to use a commercially available high-speed camera to observe vocal fold vibrations during phonation. The camera can capture dynamic digital images at speeds of 600 or 1200 frames per second. The adaptor is equipped with a universal-type attachment and can be used with most endoscopes sold by(More)
OBJECTIVES To evaluate the effect of a self-controlled vocal exercise in elderly people with glottal closure insufficiency. DESIGN Parallel-arm, individual randomized controlled trial. METHODS Patients who visited one of 10 medical centers under the National Hospital Organization group in Japan for the first time, aged 60 years or older, complaining of(More)
An event-related design for fMRI studies has recently been developed. In this design, stimuli can be presented in random order. In the present study, an event-related fMRI system for hearing experiments was developed and the usefulness of this system was assessed. The brain regions involved in an auditory oddball task were determined. The results showed(More)
Objective: We previously suggested that aberrations of the carotid arteries, which may occur when the neck is bent forward, should be considered as new risk factors for ischemic stroke. We analyzed the results of carotid artery ultrasound examination in previous case and control groups, focusing in particular on the atherosclerotic risk factor in stroke, to(More)