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At least 919 records · Page 51Linked to original sources
PubMed1982

Late onset of hearing in the ferret.

Onset of hearing in the ferret was judged by simple behavioral, physiological and anatomical indices. The ear canals do not open until the end of the first postnatal month. This coincides with the appearance of a startle response to loud hand claps and the recording of acoustically activated neurons in the midbrain. The late onset of hearing in the ferret (around 32 days postnatal) contrasts with the cat (6 days) and the mouse (12 days).

Aging↗
PubMed1982

Responses of cerebellar neurons of the CF-FM bat, Pteronotus parnellii to acoustic stimuli.

Single units (125) which faithfully discharged action potentials to acoustic stimuli (35 ms in duration with 0.5 ms rise and decay times) were recorded in the cerebellar vermis and hemispheres of the CF-FM bat, Pteronotus parnellii. These units had response latencies between 1.5 and 27 ms and minimum thresholds between 2 and 83.5 dB SPL. Best frequencies (BFs) of these units ranged from 30.32 to 79.28 kHz, but more than half (64 units, 51.2%) were between 59.73 and 63.32 kHz. While most tuning curves of these units were either broad or irregular, those curves with BFs tuned at around 61 kHz which is the frequency of the predominant CF component of the bat's echolocation signals were extremely narrow with Q10-dB values as high as 153. Those units (29) with BFs tuned near the 61 kHz also showed off-responses. These data indicate that auditory specialization for processing of species-specific orientation signals also exists in the cerebellum of this bat.

Animals↗
PubMed1984

Some physiological consequences of neonatal cochlear destruction in the inferior colliculus of the gerbil, Meriones unguiculatus.

Physiological consequences of neonatal cochlear ablation were assessed in the inferior colliculus of adult gerbils subjected at 2 days of age to ablation of one cochlea. Responses to tonal stimulation of the unoperated ear were evaluated at 100 microns intervals in the ipsilateral inferior colliculus. Compared with excitatory responses to ipsilateral stimulation in the inferior colliculus of unoperated animals, responses recorded in experimental animals are more widespread, stronger and occur at lower thresholds. The ubiquity of excitatory responses to ipsilateral stimulation in neonatally ablated animals indicates that responses to ipsilateral stimulation in normal gerbils are partly dependent upon interactions during development between pathways conveying information from each ear.

Animals↗
PubMed1985

Neural correlates of temperature coupling in the vocal communication system of the gray treefrog (Hyla versicolor).

The central nervous system of the gray treefrog includes a class of auditory neurons which respond selectively to particular rates of amplitude modulation. When body temperature is increased, the temporal tuning of these neurons shifts to higher rates of modulation. This shift in tuning parallels the temperature-dependent shift in the trill rate in the male's mating call, thus constituting the neural correlate of temperature coupling between the female's behavioral selectivity and the temporal signal characteristics in the male's call.

Animals↗
PubMed1986

Cochlear nucleus lesions in the adult gerbil: effects on neurone responses in the contralateral inferior colliculus.

Unilateral cochlea ablation in neonatal gerbils has previously been shown to result in transneuronal degeneration of the ventral cochlear nucleus (CN) and enhanced responses of neurones in the contralateral inferior colliculus (IC) to ipsilateral stimulation of the non-ablated ear. Neither effect occurs in adult-ablated animals. To determine whether the lack of physiological change in the adult is due to the persistence of the ventral CN we lesioned the left CN of adult gerbils and recorded neurone responses in the right IC to stimulation of the right ear. Neurone thresholds, latency and intensity/response functions were unaffected by the lesion. The proportion of recording loci in the IC at which excitatory responses were obtained was also unaffected. A transient increase was observed in the maximum unit discharge level. The findings suggest that CN lesions in adults do not produce either the range or degree of neuronal changes resulting from neonatal cochlea ablation and the subsequent transneuronal degeneration of the CN. Thus, the effects of cochlea ablation are age-dependent.

Animals↗
PubMed1988

Primary auditory cortex in the ferret (Mustela putorius): neural response properties and topographic organization.

Microelectrode recording studies were made of the crown of the ectosylvian auditory cortex of barbiturate-anesthetized ferrets, using calibrated, sealed acoustic stimulus delivery systems. We confirmed our previous finding using free-field stimuli that this region of the ferret's cerebral cortex contains a tonotopically organized field in which neurons are briskly excited by the onset of tonal stimuli. The vast majority of neurons in this field were narrowly tuned to tone pulse frequency, with Q factors comparable to those described for cortical cells in other species. The distribution of minimum tone thresholds across the frequency representation of this field paralleled the behavioral audiogram in the same species. The majority of neurons received input from both ears, and the natures of the influences exerted by tonal stimuli at the two ears were similar in form to those described for other carnivores. The various binaural cell types had characteristic frequencies that spanned the entire tonal spectrum represented in the cortex. Preliminary mapping studies revealed that there may be a topographic segregation of cells according to their binaural interactions. The basic properties of cells in this region of the ferret's cerebrum are similar to those previously described for the cat's primary auditory cortex. The data on the binaural properties of these cells, and the spatial distribution of those cells, provide the first evidence in a species other than the cat for segregated binaural representation in the auditory cortex.

Acoustic Stimulation↗
PubMed1990

Altered sensitivities of auditory neurons in the rat midbrain following early postnatal exposure to patterned sounds.

Pure tone sensitivity of inferior colliculus (IC) neurons in adult rats was studied electrophysiologically following exposure to a frequency-modulated (FM) tone during the first 5 postnatal weeks. The distribution of best frequencies (BF) and minimum thresholds (MT) of 274 single units, when compared to the control, showed an abnormal clustering centered around the region of the audiogram occupied by the FM tone to which the rats had been exposed. This effect was interpreted as the result of activity-dependent changes of IC during development.

Acoustic Stimulation↗
PubMed1976

The human frequency-following response: its behavior during continuous tone and tone burst stimulation.

The frequency following response (FFR) in humans has been elicited by continuous tones as well as tone bursts. The responses were observable over a range of frequencies extending from 70 c/sec to greater than 1.5 kc/sec. The threshold for the continuous response has a mean of about 40 dB SL and is perhaps several dB lower for the burst response. The response threshold as a function of sound pressure level (SPL) increases rapidly at frequencies below 125 c/sec and above 1 kc/sec. These thresholds are particularly sharp at the lower frequencies. Narrow-band noise that just produces subjective tone masking also masks the FFR. The latency of the FFR is about 6 msec when the tone burst intensity is 30 dB over FFR threshold. Comparison with click response latencies indicates that the onset of the FFR corresponds with early waves IV and V.

Acoustic Stimulation↗
PubMed1980

Sex differences in the amplitudes and latencies of the human auditory brain stem potential.

Sex differences in the amplitudes and latencies of the auditory brain stem potential (BAEP) were investigated using 3 levels of intensity and 3 stimulus presentation rates. The females displayed consistently larger BAEPs for waves IV, V, VI, VII than the males. The only latency differences which reached significance over all the intensities and rates occurred for wave V. The females showed significantly shorter wave V latencies than the males. Since hearing losses and individually determined click thresholds were comparable between the two groups tested, the exact sources of the uneven distribution of amplitude and latency effects are in question. Differences in the relative distances of the anatomical generators are considered in accounting for the sex differences. Because the precise origin of the sex differences cannot be stated with certainty at this time, attempts to develop normative data for the BAEP should consider the possible influences of sex differences.

Adult↗