Physiological studies of the precedence effect in the inferior colliculus of the kitten.
نویسنده
چکیده
The precedence effect (PE) is a perceptual phenomenon that reflects listeners' ability to suppress echoes in reverberant environments. The PE is not present at birth and appears only several months postnatal. Recent physiological studies have demonstrated correlates of the PE in the central nucleus of the inferior colliculus (ICC) of adult animals. The present study extended the same techniques to search for similar correlates in the ICC of kittens during the first postnatal month. Stimuli consisted of pairs of clicks or noise bursts presented from different locations in free field or with different inter-aural differences in time (ITD) under headphones, with an inter-stimulus-delay (ISD) between their onsets. Results suggest that a physiological correlate of the PE, i.e. suppression of responses to the second source, is present as early as 8 days postnatal, and occurs at similar ISDs to those recorded in adult cats. Suppression in kitten neurons varies with stimulus level, duration, and azimuthal position, in a similar manner to that in adult neurons. The age at which correlates of the PE in the kitten can be found precedes the age at which kittens can localize sound sources effectively, and presumably before the age at which they would demonstrate the PE behaviorally. Thus, the neural mechanisms that might be involved in the first stages of processing PE stimuli may be in place well before the behavioral correlate develops.
منابع مشابه
Physiological measures of the precedence effect and spatial release from masking in the cat inferior colliculus
متن کامل
Local inhibition of GABA affects precedence effect in the inferior colliculus
The precedence effect is a prerequisite for faithful sound localization in a complex auditory environment, and is a physiological phenomenon in which the auditory system selectively suppresses the directional information from echoes. Here we investigated how neurons in the inferior colliculus respond to the paired sounds that produce precedence-effect illusions, and whether their firing behavio...
متن کاملPsychophysical and physiological evidence for a precedence effect in the median sagittal plane.
A listener in a room is exposed to multiple versions of any acoustical event, coming from many different directions in space. The precedence effect is thought to discount the reflected sounds in the computation of location, so that a listener perceives the source near its true location. According to most auditory theories, the precedence effect is mediated by binaural differences. This report p...
متن کاملModeling Physiological and Psychophysical Responses to Precedence Effect Stimuli
Many perceptual and physiological studies of sound localization have explored the precedence effect (PE), whereby a pair of brief sounds coming from different directions and arriving at the ears close together in time is perceived as coming from a location near that of the first-arriving sound. Here, we used a computational model of low-frequency inferior colliculus (IC) neurons to account for ...
متن کاملPsychophysical and Physiological Studies of the Precedence Effect in Cats
The precedence effect (PE) is an auditory spatial illusion where the apparent location of two sounds presented from different spatial locations but separated by a delay is determined primarily by the spatial attributes of the leading stimulus. In this review, we compare previously published psychophysical and physiological experiments on the PE in cats. Also included are data from some new psyc...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- The Journal of the Acoustical Society of America
دوره 103 6 شماره
صفحات -
تاریخ انتشار 1998