'Receptive fields' diaporamas de présentation

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Sensory Systems

Sensory Systems. Christopher Skinner MD FRCPC Ottawa Hospital cskinner@toh.on.ca. Sensory Systems. Objectives. 4799 Describe the anatomical features of the somatosensory pathways. 4800 Explain the effects of damage to these pathways at different locations .

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Biologically Inspired Intelligent Systems

Biologically Inspired Intelligent Systems. Lecture 4 Dr. Roger S. Gaborski. Learning and inference in the brain Karl Friston * . Fig. 1. Schematic illustrating hierarchical structures in the brain and the distinction between forward, backward and lateral connections. QUIZ TODAY. Textbook.

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Dimension being tested

Dimension being tested. Remained constant during testing. Remained constant during testing. Remained constant during testing. Remained constant during testing. Remained constant during testing. Remained constant during testing. Remained constant during testing.

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Midterm 1

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Visual Perception: what do we want to explain?

Visual Perception: what do we want to explain? How do we get visual information from the world and use it to control b ehavior? What neural processes underlie visually guided behavior? Traditional sub-areas - visual sensitivity color vision spatial vision temporal vision

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Somatosensation

Somatosensation. Mechanoreceptors that respond to touch/pressure on the surface of the body. Sensory nerve responds propotional to pressure 4 types of mechanoreceptors: Meissner corpuscles & Merkel discs - cutaneous light touch with high resolution.

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Vision & Perception

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Somatosensory System Touch - mechanoreception

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Nucleus

Nucleus. Dendrites Collect electrical signals. Cell body Integrates incoming signals and generates outgoing signal to axon. Axon Passes electrical signals to dendrites of another cell or to an effector cell.

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Psychology 4051

Psychology 4051. The Primary Visual Cortex. The Primary Visual Cortex. A multi-layered structure located in the occipital lobe (AKA, Area 17, V1, Striate cortex). Receives axons from the LGN. Each hemisphere represents the contralateral visual field. The Visual Cortex.

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From Perception to Action

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Receptive Field

Receptive Field. [Green]. Receptive Field. The two-point threshold for any part of the body is determined by the size of the receptive fields and the extent of overlap.

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Chapter 19 Viscerosensory Pathways

Chapter 19 Viscerosensory Pathways. MP. Thibeault-Eybalin, R4 Academic Half-Day March 25 th , 2009. Outline. In parallel to somatosensory system conveying info from external environment, viscerosensory system conveys info about internal environment

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AUDITORY PERCEPTION

AUDITORY PERCEPTION. Pitch Perception Localization Auditory Scene Analysis . Pitch Perception. Pitch is mostly determined by sound frequency Intensity also influences pitch: For high frequency sounds, pitch increases with intensity

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Striate receptive fields

Striate receptive fields. By: Katelyn, Padee , Kaylee , Roger, Lucas, and Rebecca . What is a receptive field?. Every neuron in the visual system has a distinctive receptive field : an area of the retina that the cell responds to

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Object recognition in the inferior temporal cortex

Object recognition in the inferior temporal cortex. Retinotopy is not useful for object recognition, which is related to shape Object recognition does not appear to occur in the earlier retinotopic visual areas

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HM 4-4

HM 4-4. Top-down processing essentially refers to the effect that meaning, familiarity, or context has in determining our perceptions (Goldstein, 2002).

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Magnification Factor

Figure 4.4 Points A, B, and C on the cup create images at A, B, and C on the retina and cause activation at points A, B, and C on the lateral geniculate nucleus (LGN). The correspondence between points on the LGN and retina indicates that there is a retinotopic map on the LGN.

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Purpose

Output unit. AN. Weights. IN n. IN n+1. IN n. IN n+1. IN n+1. IN n. IN n. IN n+1. IN n+1. IN n+1. Input units. t-?. t-?. t. Figure 4. Generation of STRFs through ripples. Methods Neural network

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