The addition of the auditory stimulus did not shift the neurometric curve to the left as would be expected if the neuron was integrating the auditory motion cue adapted from Chaplin et al. Only one other study has investigated the effects of auditory stimuli on the responses of MT neurons Kafaligonul et al. This study aimed to test if the activity of MT neurons mediated the temporal ventriloquist illusion, in which stationary auditory clicks induce influence the perception of visual speed.
The authors hypothesized that the auditory clicks would alter the speed tuning and response duration of MT neurons in response to apparent visual motion. However, the auditory stimuli did not alter speed tuning or response duration in a way that would support the perception of the illusion, even though there was a possible modulation of the temporal spiking response.
However, since the projections from auditory to visual cortex are known to arrive at the peripheral representation of the visual field Palmer and Rosa, ; Majka et al. In conclusion, the processing of auditory and visual motion in the primate cerebral cortex utilizes different brain areas and physiological mechanisms. While good progress has been made in identifying the cortical regions involved in processing auditory and audiovisual motion, the mechanisms of audiovisual integration remain unclear.
The current evidence from single neuron studies suggests that the integration of auditory and visual motion cues is not mediated by the early visual areas MT and MST, and therefore such integration likely occurs in higher level cortical areas. Another possibility is that the integration of audiovisual motion signals is not mediated by a single brain region, but instead by synchronized network activity Lewis and Noppeney, TC wrote the first draft of the manuscript.
MR and LL wrote sections of the manuscript. All authors contributed to manuscript revision, read and approved the submitted version. The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Ahissar, M. Encoding of sound-source location and movement: activity of single neurons and interactions between adjacent neurons in the monkey auditory cortex. Alais, D. No direction-specific bimodal facilitation for audiovisual motion detection.
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However, in the auditory cortex the signal is moreover recognised, memorised and may eventually result in a response. In contrast to the primary auditory pathway, non-primary auditory pathways process all sorts of sensory messages. The core function of these pathways is hence to choose the type of sensory message to be treated first.
For example, when reading a newspaper while listening to the radio, this system permits the person to focus on the most vital task. The processing of sensory data within the non-primary auditory pathways also starts in the brain stem. Hereafter, the auditory information passes through the reticular formation, a region in the brain stem consisting of more than a hundred small neural networks.
In the reticular formation, the information that should be treated as a priority is selected in accordance with the wake and motivation centers and further treated. Finally, the messages continue to the thalamus and end up in the sensory areas located in the cerebral cortex, the outer layer of our cerebrum.
Home News How the brain processes auditory signals. Many small neurons located in the brain are responsible for the processing of auditory information. By passing through various auditory pathways, the signals are decoded into sounds that we are familiar with and make sense to us. The Auditory Brain Transformation and processing of sound generally occurs on three levels in the brain: As a reflex, in the auditory cortex and in other brain areas.
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