- your experience of the world
- converting the stimuli into something meaningful
- internal representation
The process by which a stimulated receptor (such as the eyes or ears) creates a pattern of neural messages that represent the stimulus in the brain, giving rise to our initial experience of the stimulus. An important idea to remember is that sensation involves converting stimulation (such as a pinprick, a sound, or a flash of light) into a form the brain can understand (neural signals)—much as a cell phone converts an electronic signal into sound waves you can hear.
An impression, or the consciousness of an impression, made upon the central nervous organ, through the medium of a sensory or afferent nerve or one of the organs of sense; a feeling, or state of consciousness, whether agreeable or disagreeable, produced either by an external object (stimulus), or by some change in the internal state of the body.
- processing ingo from rods of cones
- some LMS wavelengths overlap
- more efficient to record differences b/w responses of cone rather than each type
colour is categorized as red, yellow, blue and green
- process of subtracting one signal from another to give an output expressing the difference between two things.
- You can create your own demonstration of these opponent systems by observing the effect ofafterimages.
Colour opponency refers to the fact that there are three pairs of colours which have been described as those that "cannot live with each other, and yet cannot live without each other". They are red-green, blue-yellow, and white black. For, as most people know, when we look at a green surface for a brief period of time and then transfer our gaze to a neutral, blank, screen the colour of the after image is red. A yellow surface will produce a blue after image and a white surface a black one.One explanation of these opponent effects - the one most often repeated - is that they are due to adaptation in the retina. The explanation here is something like this: that a green surface reflects more green light, leading to the adaptation of the "green" or middle wave receptors. Thus adapted, the activity in the opponent "red" receptors holds sway. The result - we perceive red.