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Biomedical subjects

K Kodera

Publications and source records attributed to K Kodera.

At least 127 records · Page 7Linked to original sources
PubMed1983

Frequency-selective auditory brain-stem response in newborns and infants.

The efficacy of the frequency-selective auditory brain-stem response (ABR) in new borns and infants was assessed using an auditory stimulus of a 1-kHz tone pip and compared with the results of click-evoked ABR. In subjects whose responses to conventional behavioral audiometry were obtained at intensities of 40 to 70 dB, the ABR thresholds evoked by 1-kHz tone pips and clicks lay between 5 and 20 dB hearing threshold level (HTL). In subjects who did not respond to conventional behavioral audiometry at the intensity of 70 dB, ABR thresholds in each auditory stimulus were elevated by 35 to 70 dB HTL, and no responses were noted at 80 to 90 dB HTL. These results indicate that frequency-selective ABR can be applied clinically as an objective method of audiometry for newborns and infants.

Acoustics↗
PubMed1983

Portions of tone pips contributing to frequency-selective auditory brain stem responses.

The portions of tone pips that are effective in increasing the amplitudes of auditory brain stem responses were studied using 6 cats. The responses evoked by pips with identical slopes but different rise times were compared to one another. The results indicated that the effective portion of the tone pips extended more than 4 ms from onset at 500 and 1 000 Hz, and more than 2 ms at 2 000 Hz. Each cycle within these ranges contributed to the increase in response amplitude. These results support the contention that the frequency selectivity of the brain stem response elicited by tone pips is sufficient for objective audiometry.

Acoustic Stimulation↗
PubMed1980

Binaural interaction of a beating frequency-following response.

Frequency-following responses to 500-Hz tone bursts presented to the left ear and 540-Hz tone bursts presented to the right ear were recorded from human subjects. Recordings were made both under monaural and binaural conditions. The responses summed over monaural conditions (for left and right ear stimulation) were larger than the responses obtained in the binaural condition. This binaural interaction shows that the frequency-following response reflects binaural processing probably occurring at or below the level of the inferior colliculi.

Acoustic Stimulation↗