multimodal_wn - The map of auditory space Information from...

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Information from the owl’s IID and ITD systems come together in the owls auditory tectum (similar to the mammalian inferior colliculus). In the owls auditory tectum there is a map of auditory space. The map of auditory space Elevation Azimuth Zero azimuth, Zero elevation is straight ahead Pont 2 is at -20 o azimuth, -10 o elevation Location of sounds in the world Isoazimuth lines Isoelevation lines o o o o 10 20 -10 -20 0 o 0 o 10 o 20 o -10 o -20 o Sounds at point 2 maximally excite cells here Sounds at point 1 maximally excite cells here Location of sound responses in the tectum 20 Point 1 is at 10 o azimuth, 20 o elevation
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Mulitmodal integration is important for a wide variety of activities. Examples: 1) Motor control. Behaviors like an escape response should be able to be activated not by only a single type of sensory stimulus but by for example either the sound or the sight of a predator (or by both the sound and the sight). Therefore the neurons involved in initiating the escape response need to be able to receive input from several sensory modalities. Posture control is another example of a motor control activity which requires integrating information from several modalities. Our ability to stand upright depends on information from our vestibular system which helps us to know which way is up, and from our somatosensory system where sensors in our joints tell us the positions of our legs, and is even helped by information from our visual system which helps us to know whether our heads are straight or leaning to one side. Multimodal integration Examples Posture, 2) Communication vocal, olfactory, visual Escape, We do not just use one sensory modality at a time, but we use many. How we do this is called multi-modal integration So far in lecture we have talked about different sensory systems such as the somatosensory, visual and auditory systems as being completely separate. In fact an organism needs to bring together information from different sensory systems. This integration of information of different sensory modalities is called multimodal integration. 2) Communication. Dogs greeting each other use many modalities of sensory information. When they meet they will bark, providing auditory information, wag their tails, providing visual information and sniff each other providing olfactory information. Humans also use information of several modalities for communication. Although much of our communication is through content of what they are saying. This is especially important for example to determine whether someone is serious or “just kidding” which can completely change the meaning of what they are saying. Flight 1) Motor control McGuirk Effect - visual capture A famous phenomenon called the McGurk effect illustrates our ability to read lips. To demonstrate the McGurk effect, scientists took video tape of someone’s face as they were saying “ba ba ba ba ba“. On the sound track of the video, however, they put the person’s voice saying “ga ga ga ga ga”. So in the case the visual information (ba) is in conflict with the
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This note was uploaded on 12/10/2008 for the course NPB 100 taught by Professor Chapman during the Fall '08 term at UC Davis.

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multimodal_wn - The map of auditory space Information from...

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