7-Sensation-6

7-Sensation-6 - 1 Announcements Exam #1 Cutoffs posted in:...

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Unformatted text preview: 1 Announcements Exam #1 Cutoffs posted in: Course Documents => Exam #1 folder 1 st RER deadline is midnight Tonight. Only have to complete 2 RERs!! Sensation Sensation--Outline I. Introduction: II. Vision: A. The Eye B. Visual pathways C. Coding of Contrast and Contour D. Generalizations about Processing in the Visual System: 1. Feature Detection 2. Functional Specialization Sensation--Outline I. Introduction: II. Vision: A. The Eye B. Visual pathways C. Coding of Contrast and Contour D. Generalizations about Processing in the Visual System: 1. Feature Detection 2. Functional Specialization Introduction Everything you do depends on sensory/perceptual processing (e.g., walking, obtaining food, interacting socially). Sensory processing is fast and accurate. It needs to be for survival. Sensory Systems Various Human Senses: vision, hearing, touch, taste, smell, balance ("vestibular" sense), limb position and movement ("kinesthesis"), temperature, and pain. 2 Sensation and Perception Sensation -- initial coding of messages from the senses. Perception -- interpretation of those messages. Continuous process: Can think of sensation and perception as the transformation of incoming signals into useful information ( or representations) about the world. Definitions Receptors--specialized structures that respond to a physical stimulus by producing electrical changes that can initiate neural impulses. React directly to stimulation from the environment. Stimuli--light, sound, motion, chemicals, pressure, etc. Transduction--the conversion of energy from a physical stimulus (e.g., light) to a neural responses (action potenatials). Definitions Sensory Neurons--carry neural impulses from the receptor to the central nervous system. Sensory Areas--sensory neurons and pathways lead to specific sensory areas in the cortex. Reflex Circuit Receptors Sensory Neuron Sensory Areas--e.g., in the monkey Vision (colored areas) Somatosensation Audition Audition Sensory Areas--in the human 3 Visual Sensory Areas--in the human & monkey human monkey Properties: topographic organization. Definitions Coding Representation of the stimulus in the pattern of action potentials. Quantity : a stronger stimulus (eg, more intense light) => larger receptor potentials => faster rates of action potentials in sensory neurons (i.e., higher firing frequency). Quality : different receptors are tuned to respond to different forms of energy. specific nerve energies E.g,. retinal receptors (light) vs. touch receptors (pressure). Coding of Quantity (Intensity) The firing rate of a cell increases as stimulus intensity Increases. Definitions Coding Representation of the stimulus in the pattern of action potentials....
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7-Sensation-6 - 1 Announcements Exam #1 Cutoffs posted in:...

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