Chapter 4 (sections 4 & 5), Chapter 5 & Chapter 6 Flashcards
T or F: Some animals have no form of chemical sense
F
Olfactory perception accessory structures
nose, mouth, upper part of the throat
Olfactory perception
recieves messages regarding smells, goes through the olfactory bulb in the brain, does not connect through the thalamus
Gustatory perception accessory structure
mouth
Gustatory perception
detects chemicals in solutions that contact receptors in the mouth, about 10,000 taste buds in a person’s mouth
Tastebuds
grouped in structures called papillae, most on the tongue
Most familiar elementary sensations for the tongue
sweet, sour, bitter, salty; produced by an interaction b/w taste and smell
Where does transduction occur with touch?
in receptors or right below the skin
How does the skin encode intensity of a stimulus?
firing rate of individual neurons, number of neurons stimulated
perception
interpreting sensations using knowledge and understanding of the world
psychophysics
concerned with measuring perception: present people with a stimulus and ask them to report their perception, how much stimulation
threshold
boundary/level
absolute threshold
the minimum amount of stimulation that can be detected 50% of the time
subliminal stimulation
below the absolute threshold–stimulus too weak/brief for us to notice
supraliminal stimulation
above the absolute threshold–consistently detected/perceived
difference threshold
smallest difference b/w stimuli that can be detected 50% of the time
JND
Just Noticeable Difference
Weber’s Law
The difference threshold is directly proportional to the magnitude of the stimulus with which the comparison is being made
Fechner’s law
the stronger the stimulus/greater the magnitude of the stimulus, the bigger the change needed for a difference in stimulus intensity to be noticeable
K (constant) for weight as a stimulus
.02 or 2%
What school of thought conducted research on perception?
Gestalt Psychology
Perceptual organization (definition)
to make sense out of the things you see, you must impose some sort of organization
2 principles influencing perceptual organization
figure-ground & grouping
figure-ground
we organize stimuli into a central/foreground figure and a background
grouping
we put things together into groups
figure
part of visual field that has meaning, stands in front of the rest
ground
background
Principles of Grouping
proximity, similarity, continuity, closure
proximity
closer objects/events are to one another perceived as belonging together
similarity
similar elements that look alike
continuity
creates a continuous form/pattern
closure
filling in missing contours to form a complete object
perceptual set
a readiness to perceive stimuli in a certain way. Expectation, culture or experience can influence your perceptions, can impact a person’s perception of an object
perceptual constancies
allow us to recognize familiar stimuli under varying conditions, experience a stable perception, even though sensory output is changing you see things as the same
size constancy
changes in size of a retinal image, not change in actual size
shape constancy
the perceived shape of an object remains the same, even when seen at different angles
brightness/color constancy
brightness or color of object remains the same under different conditions or illumination, object seen as bright/same color regardless of lighting conditions
depth perception
distance between objects
binocular depth cues
require use of both eyes
eye convergence
produced by feedback from the muscles in your eyes. your eyes rotate inwards to view a close object or project it onto the retina
binocular disparity aka retinal display
each eye sees a different image, slight viewing angle in each eye
monocular depth cues
cues about distance that require only one eye
linear perspective
perception that parallel lines converge in the distance
interposition/partial overlap
objects closer to us may cut off part of your view of more distant objects
elevation
height in horizontal plane
texture gradient
closer objects have greater detail
relative size
if 2 objects are of smaller size, the one that looks smaller will be judged to be farther away
non-pictorial cue > motion parallax
if we are moving, nearby objects appear to move faster than ones farther off
ocular accomadation
changes in the ability of the lens to change its shape
depth perception in infancy
when do we perceive depth? fear and avoidance of dangerous depth don’t develop until an infant is old enough to crawl
perception of movement/motion
important: whether an object is moving, how fast it is going and where it is heading
perception of movement/motion
important: whether an object is moving, how fast it is going and where it is heading
2 types of motion
real motion, apparent motion
2 types of motion
real motion, apparent motion