Colour Vision Sensitivity & Acuity. Colour Vision Trichromatic theory of colour vision There is only one type of rod and this responds strongly to bluish-

Slides:



Advertisements
Similar presentations
The Eye. Rods and Cones The eye is made of cells that are called Rods and Cones. Cone cells are coned shaped and Rod cells are rod shaped.
Advertisements

The Eye and the Nervous System
Photoreceptors.
Color Vision Our visual system interprets differences in the wavelength of light as color Rods are color blind, but with the cones we can see different.
Color.
The Retina WALT That the retina contains millions of light sensitive cells That there are two types of light sensitive cell How an action potential is.
THEORIES OF COLOR VISION
By: Caleb Earley.  The cone cells are located in the human eye  More specifically found in the retina of the human eye.
Mr. Chapman Science 8.  As we all know by now (I hope!) the visible spectrum of light is all the colours that you can see in the rainbow – ROY G. BIV.
Colour Theory.
The Eye and the Nervous System
Module 12 Vision.  Transduction  conversion of one form of energy to another  in sensation, transforming of stimulus energies into neural impulses.
VISION.
Sensation and Perception Sensations: take it in Sensations: take it in Perception: what we do with it Perception: what we do with it.
© 2011 The McGraw-Hill Companies, Inc. Instructor name Class Title, Term/Semester, Year Institution Introductory Psychology Concepts Vision.
12.2 Essential Questions How do you see color? What is the difference between light color and pigment color? What happens when different colors are mixed?
The Visual System. The Nature of Light Electromagnetic Spectrum – An energy spectrum that includes X-rays, radar, and radio waves – A small portion of.
Do Now Try to label the diagram of the eye Use your textbook and the terms on the right to help you Optic nerve Pupil Lens Retina Vitreous Iris Cornea.
What title would you give to each droodle?. Almost bald man with a split-end.
Vision Structure of the Eye We only use light energy to see.
VISION. Vision- Physical Properties of Waves Short wavelength=high frequency (bluish colors, high-pitched sounds) Long wavelength=low frequency (reddish.
RECEPTORS IN ANIMALS RICHARD LLOPIS GARCIA Adapted by MH A2 BIOLOGY.
Colours of light can be added together to form a variety of colours.
Waves How do we see color?
Communication Topic 7: Visual Pigments
Vision  Transduction  conversion of one form of energy to another  in sensation, transforming of stimulus energies into neural impulses  Wavelength.
11 PSYCHOLOGY (8th Edition, in Modules) David Myers PowerPoint Slides Worth Publishers, © 2007 PowerPoint Slides Worth Publishers, © 2007.
What do you see?. Do you see gray areas in between the squares? Now where did they come from?
Dr. Raj Patel OD - Vancouver Vision Clinic
IPC Notes Light & Color. The colors of light that we see are the colors of light that an object reflects towards our eyes. ex) blue jeans absorb all colors.
Psychology 100:12 Chapter 5 Sensation & Perception Part III.
TO SEE OR NOT TO SEE THAT IS THE QUESTION LIGHT  Travels in waves  ROYGBIV  Colors are different wavelengths of light.
Structure of the Eye.
Unit 3 Light and Optical Systems Topic 6 The Source of Colors Remember to name and date your notes!
© 2011 South-Western | Cengage Learning A Discovery Experience PSYCHOLOGY Chapter 4Slide 1 LESSON 4.2 Vision OBJECTIVES Identify and illustrate the structures.
DO NOW. VisionVision Our most dominating sense. Visual Capture.
Figure Figure Figure Posterior Cavity Space enclosed by lens, ciliary body, retina Filled with vitreous humor –jelly-like fluid –supports.
Perception of stimuli Option A.3. Receptors detect changes in the environment. List and describe the types of specialized receptors in humans. a. Mechanoreceptors-
Light and Color. An objects color depends on the wavelength of light it reflects and that our eyes detect. White light is a blend of all colors. When.
MODULE #13: VISION. Vision Transduction: transformation of stimulus energy (light, sound, smells, etc.) to neural impulses our brains can interpret. Our.
Sensation. The process by which our sensory systems (eyes, ears, and other sensory organs) and nervous system receive stimuli from the environment A person’s.
Vision. The Eye and Vision It’s the most complex and most important sense for humans. The vision “system” transfers light waves into neural messages that.
Standard: Explain how the human eye sees objects and colors in terms of wavelengths What am I learning today? How are wavelengths detected by the human.
Lecture 49 Light and Color Ozgur Unal
Unit 4: Respiration & coordination
Light Sensing and Vision
Transduction Transformation of stimulus energies to electrochemical energy of neural impulses Sensory receptors are responsible for transduction Rods and.
Colour Theory of Light Grade 10 Optics
Review: Vision.
Color Vision by King Saud University Physiology Dept
Chapter 5 Vision.
The Visual System Part 2.
Communication Chapter 4:
Wednesday, 19 September Organisms respond to changes in their internal and external environments Eye Receptors • identify the pigments.
The Eye and the Nervous System
Some Most All Role of receptors WAL:
How do we see Colour?.
Rods vs cones Rods - large current change with a single photon
E2 Perception of Stimuli
The Visual System: Retinal Mechanisms
Electromagnetic Spectrum
10.5b Why colours change An apple looks red in normal (white) light because it reflects red light and absorbs all the other light rays shining on it.
Colour theory.
Vision Our most dominating sense. Visual Capture.
Changing Light Waves to Neural Impulses
A.3 Perception of Stimuli
Chapter 14: Light Section 2: Light and Color
(Do Now) Journal What is psychophysics? How does it connect sensation with perception? What is an absolute threshold? What are some implications of Signal.
Presentation transcript:

Colour Vision Sensitivity & Acuity

Colour Vision Trichromatic theory of colour vision There is only one type of rod and this responds strongly to bluish- green light Cones are divided into three categories, each of which has a different sensitivity to light There are red light receptors, green light receptors and blue light receptors. These cone sensitivities support the trichromatic theory as all colours of the visible spectrum can be seen by mixing the 3 primary colours (red, blue and green) White objects reflect all colours to eye, black absorbs all colours so no light to the eye.

Wavelengths of light absorbed by different cones

Colour Blindness If you have normal vision you will see a figure seven in reddish brown dots. People with red-green colour blindness will not see the 7, why? These people lack red sensitive cones, but the green stimulated cones are stimulated by the red light, so all dots appear green

Sensitivity and Acuity Rods and cones synapse with bipolar cells Bipolar cells synapse with ganglion cells Ganglion cells synapse with neurone fibres At the fovea each cone synapses individually with a ganglion cell This gives good Acuity (resolution). N.B Bright light needed Many Rods synapse with one bipolar neurone – RETINAL CONVERGENCE Dim light results in small amount of neurotransmitter release Individually, this would be insufficient to over come the threshold of the bipolar cell, but the total amount of transmitter from several rods is This gives less acuity but better sensitivity