Lecture 15.F10

Lecture 15.F10 - Neuroscience 106: Lecture 15 -...

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Neuroscience 106: Lecture 15 - Inferotemporal Cortex and Object Recognition, Motor Control Assignments: 1. In Bear et al. read Chapter 13. 2. In Reader, Study Syed et al., In vitro reconstruction of the respiratory central pattern generator. .. Motor Control I. Object recognition neurons in the inferotemporal cortex (IT) A. Three questions to answer about our perception of the visual world: 1. How do we recognize objects as belonging to a particular category? One theory is that there is a specific subset of neurons (object recognition neurons) in the IT that respond only to objects in a specific category (i.e., hand, faces, chairs, books). 2. How do we continue to recognize an object as the same even when the image of the object changes dramatically (i.e. different orientation of a hand or a book and also different hands or different books)? 3. How do we recognize and distinguish particular individuals within a category? B. Evidence suggests that “object recognition” neurons exist for some specialized categories of particularly important objects , but this may not be the only way we recognize things. C. Experimental evidence to begin to answer the above three questions: 1. How do we recognize objects as belonging to a particular category? Answer: There are specific neurons (object recognition neurons) in the IT that respond only to specific objects within a particular category (i.e. hand, faces, chairs). Researchers have recorded from neurons in IT cortex of a monkey while projecting images on a screen that the subject can see. a. It was found that some IT neurons responded only to a particular class of images. 1
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b. They found some neurons that responded only to faces . These neurons increased their rate of action potential production (increased their firing rate) whenever the image of a face was on the screen but not when a hand or a book or any other object was shown on the screen. c. The possibility was tested that these neurons might actually be responding to particular portion of the face and not to the face as a whole. When these researches blanked out particular portions of the face (for example the eyes or mouth) the neurons still responded to that image with increases in firing rate. However, when the face was scrambled, the neurons no longer responded. d. Both of these findings suggest that these are face recognition neurons, not neurons simply responding to the eye or mouth or some other subpart of the face . The above evidence also suggests that it is the spatial relationship among the subfeatures of the face that is important in inducing the neuron to respond. 2. How do we continue to recognize objects as the same even if the image of the object
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This note was uploaded on 11/10/2010 for the course CBNS 106 taught by Professor Korzus during the Fall '08 term at UC Riverside.

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Lecture 15.F10 - Neuroscience 106: Lecture 15 -...

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