Laminar fine structure of frequency organization in auditory midbrain

Article Abstract:

Sound perception is based on signal processing by frequency-selective auditory filters, or critical bands. The way in which the main auditory midbrain station's internal frequency organization may contribute to neuron critical band behaviour is investigated. A unique spatial arrangement of the frequency distribution in the inferior colliculus was found to correlate with psychophysical critical-band characteristics. The layered frequency organization could provide a spatial framework in frequency band analysis.

Auditory perception

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Topography and synaptic shaping of direction selectivity in primary auditory cortex

Article Abstract:

Research demonstrates that in the rat primary auditory cortex, selectivity of direction occurs in parallel with characteristic frequency (CF) with low CF neurons located in upward sweeps and high CF neurons in downward sweeps. Data indicate that the synaptic tonal receptive fields co-vary with CF, suggesting the shaping of frequency-modulated sweeps direction selectivity is mediated by synaptic mechanism.

United States, Physiological aspects, Neurons, Auditory cortex, Neural circuitry, Synapses

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Defects in auditory temporal and spectral resolution in language-impaired children

Article Abstract:

Research shows children with specific language impairment find it hard to detect a short tone if it comes just before a long sound of the same tone. Backwards-masking analysis provides further evidence that children have difficulty in learning how to speak if they cannot hear properly. The research can be applied to diagnostic tests in the measurement of language impairment.

Language acquisition, Language disorders in children, Childhood language disorders, Auditory perception in children, Childhood auditory perception

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