MODELS OF DIRECTION ESTIMATION WITH SPHERICAL-FUNCTION APPROXIMATED CORTICAL RECEPTIVE FIELDS

Spatial sensitivity of auditory cortex to free-field sound sources has been recognized for many years. Azimuthal sensitivity of auditory cortex to free-field tones, noise, and clicks has been studied by several investigators (see (1974) and (1981) for early work). (1990) and (1990ab) have shown that about 80% of the neurons can be classified as azimuthal sensitive. Neurons could be generally classified as having contralateral (most prevalent), ipsilateral, central, multipeaked, or omnidirectional response properties. With the development of advanced signal processing techniques, virtual-space stimuli, rather than free-field stimuli, have been used to characterize, in detail, spatial receptive fields in the cat (Brugge, Reale, Hind, Chan, Musicant, and Poon, 1994). A benefit of using virtual stimuli, aside from the efficiency of stimulus generation, is that the stimuli can be manipulated in systematic ways to dissociate specific factors shaping a cortical spatial receptive field.

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