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Lecture 3a

  • Date Submitted: 11/17/2011 07:10 PM
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Lecture 3a
Sensation – Process of receiving information about the external (and internal) world.
Perception – To impose a meaningful interpretation on the information sensation provides
Dark background makes a brighter view
Sense Receptors of all organs; have to transforming sensory information into neural signals.
Johannes Muller (1926) – People experience different types of sensations because sense organs send signals to different parts of the brain
Synasethesia – stimulation of one sensory modality evokes sensation in another modality
Everything we see is a reflection of light from an object to our retina (eye ball)
Longer wavelengths = orange/red
Shorter wavelengths = violet/blue
All wavelengths combined=White
Amplitude of light energy is the perception of brightness.
(The more light is reflected the brighter it will appear)
Single wavelength = Pure light high in saturation
Multiple wavelength = complex light low in saturation
The Eye is for Vision:
Cornea – Front of the eye: rounded and transparent helps bend light toward the lens
Lens – can be made fat/curved (light bends a lot) or skinning (light bends a little).
Fat lens is for brining close objects into focus
Skinny lens is or bringing far objects into focus
(With age lens become less flexible)
Iris –Controls how much Light enters the eye through the pupil.   Comes in blue, green, brown, hazel, etc
If bright outside, iris constricts letting less light in.
If dark outside, iris dilates letting more light in.
Retina – Patch of sensory receptors at the back of the eye. Detect the amount of light reflected from different parts of the “visual field”
  * Receptors away from the center report on periphery of the visual field, those closer to the center report on the central part of the visual field.
  * 2 Kinds of Photoreceptors:
      1) Rods – Very sensitive to light, most numerous away from the center (or fovea) of the retina
        * Responsible of vision in poor...


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