Cognitive Psychology Flashcards
perception definition
set of processes in which we recognise, organise and interpret sensations from environmental stimuli
types of perception
- olfactory
- gustatory
- vision
- audition
- touch
receptors for vision
rods and cones in retina
location of receptors for vision
eyes
TMS (transcranial magnetic stimulation) what is it
noninvasive method of temporarily exciting/inhibiting cortical areas with magnetical stimulation
TDCS (transcranial direct current stimulation)
noninvasive method of stimulating brain by passing weak current through it
fMRI
- how it works
- advantages
- brain imaging through oxygenated blood
+ good temporal + spatial resolution
PET
- how it works
- advantages
- radioactive glucose to see areas of brain activity bc increased blood flow
+ see what areas are switched on for certain tasks
pathway of vision
optic nerve -> thalamus -> cortex
perceptual features
- colour
- form
- motion
- orientation
- distance
- depth
cognitive psychology definition
how people perceive, learn, remember and think about information
auditory receptors
inner hair cells + outer hair cells in organ of Corti on basilar membrane
auditory pathway
receptor -> auditory nerve - > cortex
auditory perceptual featurs
- loudness
- pitch
- timbre
- distance
somatoreception receptor location
- skin
2, tendons - muscle
- semicircular canal of ears
3 pathways of somatoreception stimuli
- conscious perception
nerve fibres -> spinal cord -> thalamus -> cortex - coordinated motor adjustment
nerve fibres -> spinal cord -> cerebellum -> cortex - reflex
nerve fibres -> brainstem nuclei
olfaction and gustation similarities
linked to primitive parts of brain NOT cortex
- subjective experiences -> hard to put into words
absolute threshold
minimum value of stimulus for it to be noticed (or maximum for it to stop working)
difference threshold
minimum difference for two stimuli to be differentiated
Weber Fechner Law
our perceived change of sensation is not proportionate to actual change of stimuli
McGurk effect
what we see overrides what we hear
*sights influences hearing
synthesia
when one stimulation results in experiencing in unrelated modality
seeing sounds
multisensory warning - study finding
people more alert when audio-tactile signals given
location of specialised cells for face rec
fusiform gyrus
prosopagnosia
facial blindness
bottom-up processing
receiving info from sensory then analysing it in b
top-down processing
active search and interpertation of sensory data depending on goal + experience
size constancy
perceive size as constant even if distance changes
- still think car is same size when it comes towards us
shape constancy
perceive shape as constant even if changing perspectives
brightness + colour constancy
even if shadow in room makes object darker we still perceive colours
monocular perception + examples
using one eye to see depth (2D)
- texture gradients
- relative size
- interposition → if obscured by other object
binocular perception + examples
using both eyes to see 3D
- depth perception through binocular disparity (slight diff images left and right eye pick up)
motion parallax
things that are closer appear to move faster
9 Laws of Gestalt Psychology
- Prägnanz
- Figure ground
- Similarity
- Proximity
- Continuity
- Closure
- symmetry
- contingency
- small size
Prägnanz meaning
organise elements into categories simplest org with least cog skills needed
figure.ground
some elements stand out and others hide in background
proximity
objects that are close together get seen as group
similarity
similar objects form group
closure
close certain shapes that aren’t closed
symmetry
perceive objects as forming mirror image
contingency / common path
objects moving in one direction seen as group
small size
easier to extract elements characterised by small size
global precedence effect
tendency to see big picture than individual elements
local precedence effect
tendency to see individual elements rather than big picture
agnosia i
inability to perceive object
- the “” what
transcranial magnetic stimulation (TMS)
- non-invasive
- magnetic stimulation excites or inhibits cortical areas
transcranial direct current stimulation
- non-invasive
- direct current through brain stimulates
EEG
functional brain imaging method
-showing waves of E activity
ERP (event related potentials)
- functional brain imaging method
- E activity during repeated stimulus presentation
psychophysiological measurements
- EMG
- galvanic skin response
- eye-tracking
Donder’s method
subtraction method: time needed to differentiate - time needed to decide
- simple reaction time
- choice reaction time
signal detection theory
how we detect signals in environment full of distractors
diff reactions in signal detection theory
- hit
- miss
- false alarm
- correct rejection
d’ what is it
ability not distinguish signal from noise
if d’ = 0
system can’t distinguish signal from noise
if d’ = 3
system distinguishes signal from noise perfectly
implicit association test (IAT)
rxn times to categorise objects into categories to see implicit attitude towards a group
navon task
measuring local vs global perception
how do we process info?
n-back task
measures working memory
only respond if stimulus the same as stimulus n back
OSPAN task
measures working memory capacity
- solve maths task -> word -> math task -> word
2 .then sequence matrix by remembering right order of all above
verbal protocol research
participants talk out loud about thought process while performing tasks to help researchers understand how people think
attention definition
concentration of consciousness on stimulus considered most important
external attention
sensory events external to body
internal attention
internal to body
- senses
- thoughts
- motivations
dorsal attention network
- top-down processing
- selection of stimulus relevant to goals
ventral attention network
- bottom-up processing
- detects unexpected things happening around you
- detects behaviourally relevant stimuli
default mode network of attention
network of brain regions active when person not focused on external stimuli
4 functions of attention
- signal detection vigilance
- search
- selective attention
- divided attention
vigilance definition
ability to attend to field of stimuli over prolonged period of time to detect appearance of particular target stimulus
what does ratio of hits and false alarms depend on?
- signal strength to noise strength ratio
- payoff matrix -> consequences of missing or false alarms
- expectations -> higher expectations = more false alarms
search definition
try to find signal amongst distractors
selective attention
pay attention to some stimuli and ignore others
cocktail party effect
don’t listen to other conversations (semantics) unless own name gets mentioned
physical characteristics of talking that we pay attention to
- pitch
- volume
- source
attention field
- centre (closer to us) = clear + perception of detail
- periphery = not vivid + only possible to register occurence not detail
resources allocated to attention based on
- importance of task
- task requirements (simple or complex)
- level of automatisation
flow state
when task difficulty and competence match up
divided attention
allocate resources to do more than 1 task at a time
multitasking efficient when
- diff sensory used (talking and cooking)
- level of automatisation high
factors influencing attention
- anxiety
- arousal
- task difficulty
- skills
people are bad at multitasking
- more errors
- slower reaction time
- lower efficiency
Broadbent’s model of Attention
input -> sensory register -> selective filter -> perceptual process -> longterm memory -> response
unattended stimuli gets stopped at selective filter so you’re not even aware of it
proof for Broadbent’s model of attention
- dichotic listening paradigm
when two convos played in both ears you don’t know what’s being said in unattended ear
Treisman’s model of Attention
not all resources given to task we have our attention on
still aware of environment to see what’s important
proof of Tresiman’s model of attention
cocktail party effect -> notice when our name gets mentioned
Kahneman’s theory of divided attention
we can focus more on one task if we have the amount of resources available
- difficulty of task
- arousal
- allocation policy
- momentary + permanent disposition
memory definition
process where info is encoded, stored and retrieved
Atkinson and Shiffrin’s model of longterm memory
longterm memory needs to pass through linear line to become longterm
sensory store definition
- info stored up until 150 milliseconds
- greatest capacity
- visual + auditory
- transfers data to short-term