Psych Exam #2 Flashcards
(143 cards)
Sensation
the conversion of the stimulus to neutral impulses, how we take in raw information about the world
Perception
interpreting stimuli and making sense of them
Absolute Threshold
minimum stimulation necessary to detect light, sound, taste, touch, odor - half the time you will detect it and half the time you won’t
Stimulus
anything that activates our sensation systems
What is the 3-step process for a stimulus to create a perception?
- Stimulus energy reaches sense receptors
- Sense organ transducer the stimulus energy into an electrical code (neural transmission)
- This code is sent to the cerebral cortex, resulting in a psychological experience (e.g., seeing something)
What is the definition of constancy?
we experience perceptual stability even though the sensed stimulus changes
What are the two types of constancy?
shape constancy and size constancy
What is the Autokinetic Effect?
stationary objects can appear to move
What is transduction?
translation of stimulus energy into an electrical code/neural impulse
Give an example of top down processing
s
Give an example of bottom up processing
a
Difference Threshold
the minimum difference for a person to be able to detect the difference half the time (color, pitch, weight, temp)
Weber’s Law
for two stimuli to be perceived as different, they must differ by a constant minimum percentage and not a constant amount
Where is your color vision sensed?
Around the fovea
What is the trichromatic theory?
There are three kinds of cones sensitive to different wave lengths. Each cone is associated with two main colors. Explains color blindness well.
What are rods and what do they do?
They are a type of receptor cell in the retina and enable you to have night vision, see black and white and periphery vision. There are 120 million of them.
What are cones and what do they do?
They are a type of receptor cell in the retina and they enable you to see brighter light and color vision, they are near the fovea (centralized). There are 6 million of them.
Describe why someone would be colorblind according to the Trichromatic Theory?
Color blindness is due to one of the three cone systems or more malfunctioning, and colors covered by that range are misperceived. Red/green is most common and you can also have blue/yellow color blindness.
Describe the Opponent Process Theory
Receptor cells are linked in pairs and work in opposition to each other. Explains after images.
What does a bipolar cell do?
receive info directly from rods to cones and sends this info to ganglion cells
What do ganglion cells do?
collect and summarize visual info, which is moved out of the back of the eyeball through a bundle of ganglion axons called the optic nerve
What is simultaneous contrast?
Objects look lighter against a dark background than against a light background
What is lateral inhibition?
When a receptor fires, it inhibits its neighbors because they serve a similar function. An example is if a neuron that fires in response to white light fires, other similar neurons are less likely to fire. It’s purpose is to emphasize change (edges).
Binocular Desparity
a depth cue using both eyes