![]() ![]() ![]() Their activity depends upon the characteristics of the stimulus: frequency, intensity and position of the sound source in space. The precise spatial distribution of the isofrequency bands is related to the organisation of the auditory receptors. In AI, neurons are selective for particular frequencies and are arranged in isofrequency bands that are tonotopically organised. ![]() The belt region, surrounding AI and AII, which helps to integrate hearing with other sensory systems.Secondary auditory cortex (AII), which doesn't have clear tonotopic organisation but has an important role in sound localisation and analysis of complex sounds: in particular for specific animal vocalisations and human language.Primary auditory cortex (AI), composed of neurons involved in decoding the cochleotopic and tonotopic spatial representation of a stimulus.Function of the Auditory CortexĬlassically, two main functional regions have been described in auditory cortex: Descriptions of Broca's aphasia (speech disturbance caused by a lesion in Brodman's areas 44 and 45 -also now known as Broca's area) and Wernicke's aphasia (a distruption in speech perception caused by damage to Brodman's area 22) enabled the location of hearing and speech processing to be determined within cerebral cortex. The first studies linking the structure and function of the cerebral cortex of the temporal lobe with auditory perception and speech were carried out by Paul Broca (1824-1880) and Carl Wernicke (1848-1904). ![]()
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