The Times of Ira Hirsh: Multiple Ranges of Auditory Temporal Perception.

Ira Hirsh was among the first to recognize that the auditory system does not deal with temporal information in a unitary way across the continuum of time intervals involved in speech processing. He identified the short range (extending from 1 to 20 milliseconds) as that of phase perception, the range between 20 and 100 milliseconds as that in which auditory patterns emerge, and the long range from 100 milliseconds and longer as that of separate auditory events. Furthermore, he also was among the first to recognize that auditory time perception heavily depended on spectral context.

Decline of speech understanding and auditory thresholds in the elderly.

A group of 29 elderly subjects between 60.0 and 83.7 years of age at the beginning of the study, and whose hearing loss was not greater than moderate, was tested twice, an average of 5.

Lateralization of narrow-band noise by blind and sighted listeners.

The effects of varying interaural time delay (ITD) and interaural intensity difference (IID) were measured in normal-hearing sighted and congenitally blind subjects as a function of eleven frequencies and at sound pressure levels of 70 and 90 dB, and at a sensation level of 25 dB (sensation level refers to the pressure level of the sound above its threshold for the individual subject). Using an 'acoustic' pointing paradigm, the subject varied the IID of a 500 Hz narrow-band (100 Hz) noise (the 'pointer') to coincide with the apparent lateral position of a 'target' ITD stimulus. ITDs of 0, +/-200, and +/-400 micros were obtained through total waveform delays of narrow-band noise, including envelope and fine structure.