Vision - VISION 2011 PNB 2264/3298/KIMBALL Learning Outcomes Be able to Describe the gross structure of the eye Describe how the iris controls the

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1 V ISION 2011 PNB 2264/3298 /KIMBALL Learning Outcomes: Be able to Describe the gross structure of the eye Describe how the iris controls the amount of light entering the eye Describe accommodation by the lens Describe microscopic structure of the retina Describe phototransduction Diagram the visual hierarchy – from receptors to visual association cortex Describe the effect of photoreceptor activation upon on-center and off-center bipolar cells Describe receptive field properties of cells in each level of the il h i h 1 visual hierarchy Relate receptive field properties of visual cells to the types of visual information extracted Define “primal sketch” Describe the function of the visual association cortex Describe the mechanisms for color vision and depth perception I NTRODUCTION | While OPTICAL system of eye is similar to a camera, visual processing is not | Visual system transforms transient light stimuli on retina into mental constructs of a stable, 3D world! 2 | The transformational process is creative and entirely dependent upon experience
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2 V ISION | Photoreceptors transduce energy in the electromagnetic spectrum into receptor potentials. y Visible Spectrum : Wavelengths of 400 – 700 nm 3 Figure 15.17 Figure 15.7 Neurons in the retina contribute fibers that are gathered together at the optic disc, where they exit as the optic nerve. 4
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3 EXTRAOCULAR MUSCLES | Which skeletal muscle fiber type? Add following labels to Figure 15.10 (below) Add following labels to Figure 15.10 (below) Superior view (on left) Lateral view (on right) 5 I RIS RIS CONTROLS CONTROLS AMOUNT AMOUNT OF OF LIGHT LIGHT ENTERING ENTERING EYE EYE (circular) 6
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4 O PTICS Ciliary Body Accommodation: Ability of the eyes to keep the image focused on the retina as the distance between the eyes and object varies. Ciliary muscle relaxed; suspensory ligaments tight; lens flat Æ Fig. 15.12 Fig 15.21 Ciliary muscle contracted; suspensory ligaments loose; lens round/thicker Æ 7 Suspensory Ligament D EFINITION : R ECEPTIVE F IELD Retina RFs map visual world | Receptive field, for any visual cell, is that POSITION in (volume of) visual space from which light stimuli will alter the activity of the visual cell | Can also be described as th t i n f th tin 8 that region of the retina where the action of light alters the firing of the neuron
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5 M V 9 ECHANISM ECHANISM OF OF ISION Receptor Level Figure 15.14
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This note was uploaded on 03/19/2012 for the course BIO 2000 taught by Professor Ewr during the Spring '12 term at Alabama.

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Vision - VISION 2011 PNB 2264/3298/KIMBALL Learning Outcomes Be able to Describe the gross structure of the eye Describe how the iris controls the

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