The Stroop Effect (1). Red Blue Green Black Green Blue. The Stroop Effect (2). Green Red Blue Black Blue Red. Definitions. Sensation: The process of stimulating receptors Perception: Interpretation & selection of sensory input. The Retina.
The process of stimulating receptors
Interpretation & selection of sensory input
Made of about 107 million transducers:
100 million rods
7 million cones
Cells are connected so as to place sensations of:
In the following slide, fix your eyes
on the dot in the center of the flag
See the glowing white spots where the black lines cross?
Hair cells, once lost, do not regenerate
Even some children's toys can cause permanent hearing loss
Usually caused by continuous exposure to excessive noise
The louder the noise, the less exposure needed
The least numerous sensory receptors
(humans have only about 10,000)
Ex: taped messages that are below auditory level
In one study, subjects were given audio tapes labeled for weight loss.
The tapes with subliminal anti-smoking messages were just as effective as those with weight-loss messages. The label mattered, not the messages.
Consider this: If you could read minds, couldn't you find something more worthy (and profitable) for your talent than to do cheap parlor tricks?
The point where you can tell the stimulus is there vs. not there 50% of the time
The smallest change in the stimulus that is just detectable 50% of the time
We organize the world so some parts of a stimulus appear to stand out (figure) in front of other parts (ground)
Example: lines are continued through if they cross other lines
We tend to complete figures with gaps in them, by ignoring the gaps and mentally filling in what we believe should be there
Convergence -- the lenses of your eyes move closer together when things are close, farther apart when things are farther away
Binocular Disparity --
parallel lines converge into the distance
bigger things appear to be closer
textures become finer as things become more distant.
Shadowing distinguishes bulges from indentations
Largely a learned cue
Objects closer than our fixation point move opposite to our direction of motion.
Objects farther away move in the same direction as us.