Understanding sensory-motor integration

1. Understanding sensory-motor integration

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

3. Organization of sensory systems • Sense organs • Receptors-specificity and transduction • Receptive fields- and limitations • coding- labeled lines vs pattern coding • Adaptation and suppression • Neural relays and recoding • Intra-modality sensory Convergence • Cortical representation/ perception • Sensory subsystems

4. The Visual System

5. Tracing the ccts of vision

6. Organization of sensory systems • Sense organs • Receptors-specificity and transduction • Receptive fields- and limitations • Adaptation and suppression • coding- labeled lines vs pattern coding • Neural relays and recoding • Intra-modality sensory Convergence • Cortical representation/ perception • Sensory subsystems

7. The organ of vision

8. The eye is like an SLR camera

9. Like a camera • Lens-focus • Iris-light control (aperture) • Photoreceptors- transduction of light info (Light sensitive film)

11. The lens-a small point of interest

12. Like a camera-lens is curved • Upside-down and inverted

13. Like a camera- Control of eye movement also critical

14. Eye movement- 3 major types of movement that can affect vision Pursuit/tracking Saccades vergence

15. Organization of sensory systems • Sense organs • Receptors-specificity and transduction • Receptive fields- and limitations • Adaptation and suppression • coding- labeled lines vs pattern coding • Intra-modality sensory Convergence • Neural relays and recoding • Cortical representation/ perception • Sensory subsystems

16. Sensitivity and Limitations of the visual system: visible light spectrum

17. Organization of sensory systems • Sense organs • Receptors-specificity and transduction • Receptive fields and limitations • Adaptation and suppression • coding- labeled lines vs pattern coding • Intra-modality sensory Convergence • Neural relays and recoding • Sensory subsystems • Cortical representation/ perception

18. The Iris • Controls light exposure

19. Organization of sensory systems • Sense organs • Receptors-specificity and transduction • Receptive fields- and limitations • Adaptation and suppression • coding- labeled lines vs pattern coding • Intra-modality sensory Convergence • Neural relays and recoding • Sensory subsystems • Cortical representation/ perception

20. The retina-photoreceptive tissue

21. Visual field and retino-topic organization

23. More on the retina

25. Photoreceptors

26. Rods and Cones

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

28. ROD CONE DISTRIBUTION

29. FOVEA

30. FOVEA and optic disc/blind spot

31. Foveal acuity

32. Retinal circuitry

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

35. What accounts for Foveal acuity

36. Accounting for Foveal Accuity1. Cone properties 2. Circuitry

38. Color Coding in cones

40. The Trichromatic Theory of color

41. Receptive fields of Ganglion cells

42. Set up for sensory evoked recording

43. Sensory convergence

44. Retinal photoreceptors corresponding to Ganglion cell receptive fields

46. Purpose of ganglion cell receptive fields?

47. Lateral inhibition?

48. Lateral inhibition

49. Overlapping receptive fields contribute to lateral inhibition The center of one field may be the surround of another

50. Retina ganglion cell axons coalesce