F10_L08_vision

F10_L08_vision - Psy 111 Basic concepts in Biopsychology...

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Psy 111 Basic concepts in Biopsychology Lecture 8: Vision
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Sensory systems “getting info encoded in the primary sensory cortex” 1. Principles of sensory systems 2. Chemical sensory systems 3. Vision: the photic sensory system 4. Hearing & Touch: the mechanical sensory systems
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Principles of Sensory Systems Transduction Mechanism - envirnomental energy -> biological energy Receptive fields – each neuron is “receptive” to info from a specific subset of sensory information…often defined anatomically Topographically arranged – “shape” of information is maintained Relay Centers – series of projection neurons Parallel Pathways – “quality” of information is maintained Hierarchical organization – convergence at relays to cortex Cross Midline – it just does…
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Objectives ± Describe nature and properties of light. ± Identify the route of light into the eye to the retina. ± Describe the organization and circuitry of the retina ± Explain transduction of light in the two types of photoreceptors (rods and cones); how are they different? ± Describe the nature of color transduction. ± Explain the inputs to bipolar cells and ganglion cells. ± Describe the output pathways from the retina. ± Describe the lateral geniculate nucleus. ± Discuss the inputs and organization of primary visual cortex. ± Describe the secondary and association visual cortices; use face cells example. ± Identify the two streams of higher visual processing.
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Electromagnetic Waves “Light” is comprised of waves of photons Photons are emitted with different energies resulting in different wavelengths and different amounts resulting in different amplitudes of waves.
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The visible spectrum is a small portion of the total spectrum of wavelength of light. Keep in mind we only perceive these as different colors of light; i.e. perception is a creative process of the brain ! The visible spectrum Short Wavelength Long Wavelength
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Movement of Light Absorption is how eye detects energy; ie transfer of energy = Transduction Refraction is critical to pattern of light = shape detection
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Structure of the Eye
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But we really have two eyes… Some perceptual processes (and many illusions) in vision result from having two independent sites of visual input: •Convergence: turning inward to see objects up close •Binocular disparity: difference in the position of the same image on 2 retinas Æ enables you to construct a 3-D perception from two 2-D images on your retinas
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The visual field
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Inner Surface of the Eye
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Where light is TRANSDUCED into biological energy (i.e. detected).
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This note was uploaded on 12/18/2010 for the course PSYCH 111 taught by Professor Kippen during the Fall '08 term at UCSB.

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F10_L08_vision - Psy 111 Basic concepts in Biopsychology...

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