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Results for “Auditory Perception”

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At least 127 records · Page 7Linked to original sources
PubMedDate not supplied

Invariability of auditory perception with respect to frequency--time signal transformations in the dolphin Tursiops truncatus.

The characteristic of hearing in the dolphin Tursiops truncatus were investigated by the method of motor-feeding conditioned reflexes under conditions of frequency--time signal indeterminancy with background noise. It was shown that the effectiveness of auditory detection of tone--pulse signals is invariant with respect to Doppler and shift signal transformations, while the number of waves is a characteristic parameter of the auditory system.

Animals↗
PubMedDate not supplied

[The invariance of auditory perception with regard to frequency-temporal transformations of the signal in Tursiops truncatus dolphins].

In experiments on the porpose T. truncatus, using motor-feeding conditioned reflex technique, studies have been made on hearing under the conditions of frequency-temporal indetermination of the signal presented at noise background. It was shown that the effectiveness of auditory detection of tone-impulse signals is invariant with respect to Doppler and shift transformation of the signal, whereas the number of waves serves as a characteristic parameter of the auditory system in the porpoise.

Animals↗
PubMed1998

Localisation and characterisation of auditory perception through Functional Magnetic Resonance Imaging.

In the last few years, Functional Magnetic Resonance Imaging (fMRI) has been widely accepted as an effective tool for mapping brain activities in both the neurosensorial and the cognitive field. The present work aims to assess the possibility of using fMRI methods to perform a non-invasive evaluation of the human auditory function. To this end the cortical response to different non speech stimuli (pure tones, pulsed tones) was examined for ten subjects with no audiological impairment. Our findings point out some remarkable differences in both the spatial and the temporal features of the primary auditory cortex response to pulsed tones and to pure tones.

Adult↗
PubMed1999

Auditory perception: does practice make perfect?

Recent studies have shown that adult humans can learn to localize sounds relatively accurately when provided with altered localization cues. These experiments provide further evidence for experience-dependent plasticity in the mature brain.

Adult↗
PubMed1977

Auditory perception of spatiotemporal patterns.

To test the tendency of subjects to perceptually organize discrete temporal patterns with regard to runs of identical stimulus events, spatiotemporal patterns of white noise were presented for reproduction. The subjects in Experiment I began their reproductions with the true starting points of the patterns, but the subjects in Experiment II, who could not perceive the true starting points, began their reproductions with either long or short runs. It is suggested that changes in runs of auditory patterns are perceptually analogous to changes in contours of visual patterns.

Acoustic Stimulation↗
PubMed1976

Note on auditory perception of physiognomic properties in short melodic structures.

The present study shows that short melodies composed to conform with the Gestalt features of line-schematizations which had been drawn to be expressive of certain emotions and concepts were, in turn, judged by both 28 blind boys and girls and 87 college students sighted subjects, according to prediction. The results are interpreted as supporting the underlying hypothesis that physiognomic properties are "similar" across modalities.

Adolescent↗
PubMed1996

From auditory image to auditory percept: facilitation through common processes?

Two experiments explored implicit memory for auditory stimuli as measured by a test of perceptual identification. The facilitative effect of perceived auditory primes was contrasted with that of imaged auditory primes. In Experiment 1, there was a significant priming effect from imaged spoken-word primes that did not differ significantly from the level of priming due to perceived spoken-word primes, measured by a test of auditory perceptual identification. There was no facilitation of spoken-word identification following creation of an image of a word's referent sound. In Experiment 2, identification of an environmental sound was facilitated by prior processing of an imaged sound from the same category, though there was significantly more transfer following processing of the actual sound.

Humans↗
PubMed1992

Auditory perception of conspecific and heterospecific vocalizations in birds: evidence for special processes.

Budgerigars (Melopsittacus undulatus), canaries (Serinus canaria), and zebra finches (Poephila guttata castanotis) were tested for their ability to discriminate among distance calls of each species. For comparison, starlings (Sturnus vulgaris) were tested on the same sounds. Response latencies to detect a change in a repeating background of sound were taken as a measure of the perceptual similarity among calls. All 4 species showed clear evidence of 3 perceptual categories corresponding to the calls of the 3 species. Also, budgerigars, canaries, and zebra finches showed an enhanced ability to discriminate among calls of their own species over the calls of the others. Starlings discriminated more efficiently among canary calls than among budgerigar or zebra finch calls. The results show species differences in discrimination of species-specific acoustic communication signals and provide insight into the nature of specialized perceptual processes.

Animal Communication↗
PubMed1978

Acoustic features and auditory perceptions of the cries of newborns with prenatal and perinatal complications.

This article describes 2 experiments which examine the relation between neonatal cry features and obstetric histories. Experiment 1 shows that 24 clinically healthy, normal newborns who may be at risk due to a high number of prenatal and perinatal complications can be distinguished from 24 low-complications infants by harmonic and durational features of the cry. High-complications infants required more stimulation to elicit the cry, had a longer latency to cry onset, a shorter first cry expiration, a higher cry pitch, and cried less in total time than low-complications infants. In experiment 2, naive adults rated the high-complications infant cries as more aversive, grating sick, urgent, distressing, piercing, discomforting, and arousing than low-complications infant crues. Factor analyses showed that although the low-complications infant cries were described along one dimension of discomfort, a second factor emerged conveying the "sick" nature of the sound of the cry of the high-complications infants. It was suggested that certain cry features may reflect the risk status of the infant.

Adult↗
PubMed1981

[Auditory perception and fetal reaction to react to sound stimulation (author's transl)].

The confirmation of techniques used to stimulate the fetus in utero led us to an exhaustive study of spontaneous intra-uterine noises and those modified by different stimuli (while evaluating the diagnosis of fetal distress with flat cardiac rhythm during pregnancy). By the use of elaborate techniques simultaneously we could appreciate the signal and analyse the information obtained and we able to show incontrovertibly that over and above the basal sound that the fetus could hear it could appreciate the mother's voice and other voices, which were perfectly audible to it but lacking in tone because the sharp frequencies were absorbed. The first results of stimulation using calibrated sounds seem to confirm that the fetus does not react to a sound stimulus when it is in a state of fetal distress, but when there is no fetal distress it does react immediately by change in the heart rate, often associated with movements. This technique, incidentally, can be used to show if the fetus can hear well in the uterus in cases of family deafness or of rubella associated with pregnancy.

Acoustic Stimulation↗