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Vision . Most frequently studied sense Most information comes through eyes. Objectives. Analyze the different psychological aspects of vision (HUE/BRIGHTNESS/ SATURATION ) Synthesize the anatomy of the eye ( CREATE A picture) including the image-focusing portion ( cornea , lens, pupil )

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vision

Vision

Most frequently studied sense

Most information comes through eyes

objectives
Objectives
  • Analyze the different psychological aspects of vision (HUE/BRIGHTNESS/ SATURATION)
  • Synthesize the anatomy of the eye ( CREATE A picture) including the image-focusing portion (cornea, lens, pupil)
  • How does the eye connect to the brain?
vision how the nervous system processes light
Vision: How the Nervous System Processes light
  • Anatomy of Visual Sensation: Eye is like a camera
  • Extracts info. From light waves
  • Same as X-rays and radio waves
you create color
You create Color
  • Color is a Sensation that the Brain creates on a wavelength
  • As a result color is created in your mind (psychological experience).
  • Create visible light- Pure Energy
psychology of vision ob 1
Psychology of vision= ob #1
  • Wavelength-the distance traveled on a wave cycle. Like ripples on a pond
  • Electromagnetic Spectrum- the light we can see.
  • We see through a Visual Spectrum. Like a window
what we see

chapter 6

What we see

Hue

Visual experience specified by color names and related to the wavelength of light

Brightness

Visual experience related to the amount of light emitted from or reflected by an object

Saturation

Visual experience related to the complexity of light waves

3 psychological aspects of vision ob 1
3 psychological aspects of vision OB#1
  • Hue- the dimension of visual experience specified by color names related to the wavelength of light
slide9

Brightness-Intensity or amplitude of light.

  • How much light reaches the Retina.
  • Brain senses neural activity.
slide10

Saturation- (colorfulness) vividness or purity of color

  • Dimensions of visual experience related to the complexity of light waves
an eye on the world

chapter 6

An eye on the world

Cornea

Protects eye and bends light toward lens

Lens

Focuses on objects by changing shape

Iris

Controls amount of light that gets into eye

Pupil

Aperture through which light reaches the retina

anatomy of eye photoreceptor cells rods cones
Anatomy of eye (photoreceptor cells- rods/cones)
  • Retina-light sensitive layer; like chip in digital camera
  • Rods: 125 million, see in the dark. They detect low intensities of light at night. For Example rods help you find a seat in a dark theater.
  • Cones: 7 million, color, bright light. See either blue, red or green
an eye on the world1

chapter 6

An eye on the world

Retina

Neural tissue lining the back of the eyeball’s interior containing the receptors for vision

Rods

Visual receptors that respond to dim light

Cones

Visual receptors involved in color vision

your turn

chapter 6

Your turn

You have a hard time locating your red car at night, in the poorly lit mall parking lot. Why?

1. Your rods are less sensitive to color in dim light.

2. Your cones, which detect color, do not function well in dim light.

3. Your ganglion cells receive insufficient overall stimulation to

function.

4. Your rods, which detect color, do not function well in dim light.

your turn1

chapter 6

Your turn

You have a hard time locating your red car at night, in the poorly lit mall parking lot. Why?

1. Your rods are less sensitive to color in dim light.

2. Your cones, which detect color, do not function well in dim light.

3. Your ganglion cells receive insufficient overall stimulation to

function.

4. Your rods, which detect color, do not function well in dim light.

more anatomy in the back
More anatomy- IN THE BACK
  • Fovea: small, concentrated area=sharpest vision
  • Bipolar neurons (cells): collect from many photoreceptors (rods & cones) then shuttles them to Ganglion cells
  • Ganglion cells- Form axons that go to optic nerve carries info to back of eye
objective 3
Objective #3
  • You look with your eyes but see with your brain.
  • Visual cortexlies in Brain’s occipital lobe
  • V.C. turns neural impulses into visual sensations: color, form, boundary, movement and depth.
  • Ultimately cortex combines with memories, emotions, motives and sensations
the visual system is not a camera

chapter 6

The visual system is not a camera

Much visual processing is done in the brain

Some cortical cells respond to lines in specific orientations (e.g., horizontal).

Other cortical cells respond to other shapes (e.g., bulls-eyes, spirals, faces).

Feature detectors

Cells in the visual cortex that are sensitive to specific features of the environment

summary
Summary
  • PYSCHIOLOGICAL= VISION
  • ANATOMY,FRONT, MIDDLE BACK
  • WHAT PLUGS IN?