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SENSING

SENSING. Understanding sensory-motor integration. ORGANIZATION OF SENSORY SYSTEMS. Sensori-motor integration External senses Localize/Detect and monitor change Tuned…sense modes Less sensitive to unchanging stimuli. The Visual System. Tracing the ccts of vision. The organ of vision.

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SENSING

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  1. SENSING

  2. Understanding sensory-motor integration

  3. ORGANIZATION OF SENSORY SYSTEMS • Sensori-motor integration • External senses • Localize/Detect and monitor change • Tuned…sense modes • Less sensitive to unchanging stimuli

  4. The Visual System

  5. Tracing the ccts of vision

  6. The organ of vision

  7. The eye is like an SLR camera

  8. Like a camera • Lens • Iris • photoreceptors

  9. The lens

  10. Like a camera • Upside-down and inverted

  11. Control of eye movement also critical

  12. Eye movement Pursuit/tracking Saccades vergence

  13. Sensitivity and Limitations of the visual system

  14. The Iris • Controls light exposure

  15. Visual field and retino-topic organization

  16. The retina-photoreceptive tissue

  17. More on the retina

  18. Receptive fields and Coding RODS- dark/low illumination sensitive to movement peripheral vision CONES- High illumination sensitive to color foveal vision

  19. ROD CONE DISTRIBUTION

  20. FOVEA

  21. FOVEA and optic disc/blind spot

  22. Coding in cones

  23. Foveal acuity

  24. NOTE: • Light passes through ganglion cell layer, and bipolar cell layer before striking photoreceptors ( light transparent). • Activation of photoreceptor activats cct in reverse direction.

  25. Sensory convergence

  26. Retina ganglion cell axons coalesce

  27. …and leave eye chamber to form the optic nerve

  28. From retina to cortex

  29. Partial decussation at optic chiasm Decussation-crossing over Not as simple as left and right eye Decussation of visual field info

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