midterms Flashcards
cognitive psychology
the study of mental processes, determining the characteristics and properties of the mind as well as how it operates
wilhem wundt
first person to apply scientific method into understanding the human mind
approach: structuralism
method: analytic introspection
structuralism
description of the contents of consciousness
overall experience is determined by sensations, combinations of basic elements
“periodic table of the mind”
analytic introspection
a technique whereby trained participants described their experiences and thought processes in response to a stimuli
problems with introspection
- only applies to conscious processing
- poor reliability between subjects
- subjective
- hard to relate to physiology
- made little progress in understanding the mind
john watson
behaviorism
he rejects introspection as a method
focuses on observable behavior
ignores tjose that are no observable
parsimony important to him
parsimony
the most simple explanation is the correct one
behaviorism
B.F. Skinner
behavior is shaped by rewards and punishments
rewarded > increase in the action
punished > decrease in action
challenges to behaviorism
Tolman; cognitive maps and rats
rat learned the maze layput rather than the reward of food
Chomsky
language
children do not only learnlanguage through imitation and reinforcement, thus thinks that children implicitly lesnr rules of language and language must then be determined by an inborn biological program
not learned through behaviorism or social learning
cognitive apprach
focus on what occurs inside the mind before action
onformation processing approach
information processing approach
sequences of mental operations
Donder
reaction time as a behavioral measure
simple vs choice
simple: flash of light and respond
choice: light from the left or right
difference in RT between the simple and choice conditions indicate devison making time
decision making time = choice RT - simple RT
limitations of experimental cognitive psychology
- ecological validity (white-room effect) only applicable in lab settings, not generalisable
- provide indirect evidemce that may not demonstrate neurological and computational plausibility
neurophsyochology
study of the behavior of people with brain damage, provodes insights into the functioning of different parts of the brain
action potential
all or none
active for ~1millisecond
travel all the way down without changing their height or shape
action potentials always remainnthe same even if the stimulus is stronger -> just have more impulses rather than stronger ones
neurons
basic building blocks of the brain
cajal
discovered that nerve nets were not continuous, but individual cells with synpases in between
resting potential
when there are no signals, -70mV realative to outside
graded potential
proportional to stimulus strength
specificity coding
idea that an object could be represented by the firing of a specialized neuron that responds only to that object
population coding
the representation of a particular object by the pattern of firing of a large number of neurons
sprase coding
object is represented by a pattern of firing of only a small group of neurons
localisation of function
specific functions are served by specific areas of the brain
double dissociation
when damage to one part of the brain causes function A to be absent while function B is present
AND
damage to another area causes function B to be absent while function A is present
allows us to identify functions that are controlled by different parts of the brain
FFA
fusiform face area (recognition of faces)
PPA
parahippocampal place area (recognition of places)
fMRI
functional magnetic resonance imaging
uptake of oxygen indicates brain areas that are active during an activity
EEG
electroencephalography
measure brain waves (bc neurons use electricity and action potentials)
perception
experiences that result from stimulation of the sense
- can change based on added info
- involves (often unconscious) process similar to reasoning or problem solving
- occur in conjunction with actions
bistable state
switch between 2 images in an ambiguous figure
rabit vs duck
inverse projection problem
refers to the task of determinng the object responsible for a particular image on the retina
start from the retinal image -> extend outward to the source of that image
why is it difficult to desogn a perceiving machine?
- objects can be hidden or blurred
- ambiguous
- angles (viewpoint invariance)
- humans can make use of environmental cues and pre-existing knowledge to add context and understand the image
top-down processing
perception starts with the brain, based on knowledge, esperience, and expectations
bottom-up processing
perception starts with the senses
relies on incoming raw data
Helmholtz
theory of unconscious inference (top-down)
likelihood principle: we perceive the object that is “most likely”
unconscious interference: perceptions are the result of unconscious assumptions that we make about the environment
Bayesian inference
one’s estimate of the probabilityis due to
- prior probability (initial belief about the probability of an outcome)
- likelihood of a given outcome
cough -> lung disease vs cold vs heart burn example
oblique effect
ppl perceive horizontals and verticles easier than other orientations
light-from-above assumption
assume light always comes from above sl we perceive images with that in mind too
semantic regularities in scene schemas
in a kitchen setting
we expect a bread
but when we are flashed with a pic with a letterbox there (looks v much like a loaf) we will assume we saw a bread and think it is bread
(gestalt) law of good continuation
lines tend to be seen as following the smoothest path
(gestalt) law of pragnanz
every stimulus pattern is seen so the resulting structure is as simple as possible
(gestalt) law of similarity
simialr things appear to be grouped together
(gestalt) law of closure
tendency to see visual item as part of a larger object
figure-ground
background vs foreground show different objects
heuristics
rule of thumb mental shortcuts provides best-guess solution fast often correct
algorithm
procedure guaranteed to solve a problem
slow
definite result
recognition-by-components theory
put together the smaller pieces ro form the big picture
geons
3d volumes, put together to form an object
36 diff variations present
local viewpoints
thatcher illusion
we can identify objects from many different orientations
what and where pathways
temporal lobe: what (ventral) pathway, identifying
pareital lobe: where (dorsal) pathway, location