6 Psych 15 Sensation

6 Psych 15 Sensation - The Visual System I The Eye Detects...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
The Visual System I. The Eye Detects Electromagnetic Energy A. The visible light spectrum (ranges 380 - 760 nm for the human eye) 400 500 600 700 Wavelength (nm)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
B. The structure of the eye 1. RETINA 2. FOVEA 3. BLIND SPOT 4. OPTIC NERVE
Background image of page 2
C. The cells of the RETINA 1. RODS -- scotopic vision; CONES -- photopic vision 2. BIPOLAR and GANGLION cells-- retinotopic map 3. AMACRINE and HORIZONTAL cells--lateral processing
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
D. Photochemical transduction IN THE DARK 1. Rods are continuously depolarized. 2. Glutamate release occurs spontaneously. IN THE LIGHT 1. Light bleaches rhodopsin. 2. cGMP is broken down and sodium channels close. 3. Rods are hyperpolarized. 4. Glutamate release is inhibited.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
II. Visual Pathways A. Primary visual pathways--ganglion cells in retina-- lateral geniculate nucleus (LGN)--primary visual cortex 1. magnocellular pathway-- ventral LGN--fast response-- response to moving stimuli 2. parvocellular pathway--dorsal LGN--slow response--response to color
Background image of page 6
B. Secondary visual pathway the retina also projects to the superior colliculus 1. mediates tracking movements 2. mediates saccades (brief eye movements)
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
III. Connections in the Visual Cortex
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/05/2008 for the course PSYCH 15 taught by Professor Woolf during the Spring '08 term at UCLA.

Page1 / 38

6 Psych 15 Sensation - The Visual System I The Eye Detects...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online