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FIGURE 3.2. Visual–auditory interactions in ferret auditory cortex.

FIGURE 3.2

Visual–auditory interactions in ferret auditory cortex. (a) Proportion of neurons (n = 716) that responded to contralaterally presented noise bursts (auditory), to light flashes from an LED positioned in the contralateral visual field (visual), to both of these stimuli (AV), or whose responses to the auditory stimulus were modulated by the presentation of the visual stimulus, which did not itself elicit a response (AVmod). (b) Bar graph showing the relative proportions of unisensory auditory (white), unisensory visual (black), and bisensory (gray) neurons recorded in each auditory field. The actual numbers of neurons recorded are given at the top of each column. (c) Proportion of neurons whose spike rates in response to combined visual–auditory stimulation were enhanced or suppressed. Total number of bisensory neurons in each field: A1, n = 9; AAF, n = 16; PPF, n = 13; PSF, n = 32; ADF, n = 32; AVF, n = 24. (d) Distribution of mutual information (MI) values obtained when two reduced spike statistics were used: spike count and mean spike latency. Points above the unity line indicate that mean response latency was more informative about the stimulus than spike count. This was increasingly the case for all three stimulus conditions when the spike counts were low. (Anatomical data adapted from Bizley, J.K. et al., Cereb. Cortex, 17, 2172–89, 2007 and Bizley, J.K., and King, A.J., Hearing Res., 258, 55–63, 2009.)

From: Chapter 3, What Can Multisensory Processing Tell Us about the Functional Organization of Auditory Cortex?

Cover of The Neural Bases of Multisensory Processes
The Neural Bases of Multisensory Processes.
Murray MM, Wallace MT, editors.
Boca Raton (FL): CRC Press; 2012.
Copyright © 2012 by Taylor & Francis Group, LLC.

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