Study Guide 2 Biopsych - Introduction to Biological...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Introduction to Biological Psychology Exam 2 – Study Guide Chapter 8: Vision NOTE: More class time was devoted to vision than other sense and this will be reflected on the test in terms of number of questions and level of detail of the questions. The Stimulus -Characteristics of Light Waves: Hue, saturation, brightness Anatomy of the Visual System -Know the major structures of the eye (Lecture 1 page 3) Cornea, Iris, Pupil, Sclera -Know the major eye movements Vergence moving eyes coordinately, moving together Pursuit going to target Saccadic back and forth movements -Know the differences between rods and cones Rods most dense in periphery, gray colors, Cones most in fovea, colors, details -Know the organization of the retina (e.g. distribution of rods/cones, blindspot) Blindspot area appxoimately 20° nasal side, no rods or cones Fovea has direct path to photoreceptors, small receptor/ganglion ratio -Understand the process of transduction for light waves (page 9, lecture 1) 1) Light strikes rhodopsin 2) Rhodopsin molecule splits, retinal binds with and activates transducin 3) Transducin activates phosphodiesterase 4) Phosphodiesterase destroys cyclic GMP, closes ion channel 5) Cations no longer enter, membrane hyperpolarizes *6) Hyperpolarizaing membrane potential in photoreceptor depolarization membrane potential in bipolar cell recording of action potentials goes to brain -Know the difference between receptive field and visual field Receptive Field Region of the visual world that stimulates a receptor cell or neuron Visual Field Region of the visual world that is seen by the eyes -Know the details of the visual pathway from eye to primary visual (striate) cortex. You should be able to draw the pathway and understand what lesions in specific areas would cause (lecture slides) Eyes Optic Nerve 1) Ipsilateral: Optic Tract LGN Visual Cortex 2) Contralateral: Optic Chiasm Optic Tract LGN Visual Cortex **Note ABCD and Monocular areas in picture** -Know the differences between magnocellular, parvocellular and koniocellular layers (lecture slides)
Background image of page 1

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

View Full DocumentRight Arrow Icon
Magnocellular Parvocellular Koniocellular Color No Red/Green Blue Contrast High Low Spatial Resolution Low High Low LGN Layers 1,2 3-6 Ventral to other layers Striate Layer 4Ca (alpha) 4Cb (beta) and blobs 3 (bobs only) Stream most to dorsal equal output to ventral -Understand the concept of a retinotopic map A spatially organized neural representation of the external world (point-by-point analogy) Coding of Visual Information in the Retina -Know the difference between ON cells and OFF cells On cells center responds to light via excitation Off cells center responds to light via inhibition -Understand trichromatic coding in photoreceptors Trichromatic Theory color vision based on the coding of three primary colors: red, green, blue -the color we see is determined by the relative responses of the different cone types -if all are equal, we see white
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/28/2008 for the course PSYCH taught by Professor Head during the Fall '08 term at Washington University in St. Louis.

Page1 / 7

Study Guide 2 Biopsych - Introduction to Biological...

This preview shows document pages 1 - 3. Sign up to view the full document.

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