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Perception (Class Notes: ch.1-2)
N/A
42
Psychology
Undergraduate 4
02/27/2011

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Cards

Term
4 Analytic Approaches
Definition
Bottom up processing, top-down processing, sensorimotor integration, emergent processing
Term
Emergent processing
Definition
Perception you cannot predict
Term
Bottom up processing
Definition
environmental stimulus->attended stimulus->timulus on receptors->transduction->processing->perception (cyclical)
Term
sensorimotor integration
Definition
action->environmental stimulus->attended stimulus->stimulus on the receptors->transduction
Term
multimodal synthesis
Definition
unique interaction of senses to create an unexpected perception
Term
Binding problem
Definition
brain activity is connected to consciousness
Term
3 levels of Analysis
Definition
Ecological, Physiological, psychophysical
Term
Ecological analysis
Definition
Situate perception in natural history, habitat
Term
Physiological analysis
Definition
Identify physiological mechanisms
Term
Psychophysical analysis
Definition
Quantify stimulus-perception relationship
Term
Raccoon and coatimundi
Definition
Have neural mechanisms that reflect their physical characteristics (nose and paws)
Term
Excitatory Post Synaptic Potential (EPSP)
Definition
less negative (toward 0 millivolts) changes in electrical status)
Term
Inhibitory Post Synaptic Potential (IPSP)
Definition
more negative than -70 millivots
Term
During resting period (or potential)...
Definition
charge is negative
Term
Why cells are semi-permeable...
Definition
B/c if they were completely permeable, concentration gradient would move from higher to lower concentration.
Term
Hyperpolization
Definition
inhibtory event, shows that light has been absorbed (more negative)
Term
Depolarization
Definition
Less negative
Term
The bigger the hyperpolarizig stimulus...
Definition
the greater teh graded potential
Term
Difference between perception and recognition...
Definition
you can perceive without recognition
Term
Physiological methods
Definition
Retinal microspectroscopy- receptors.
Rod photoreceptor->record change in membrane with a microelectrode
Term
Neural projections
Definition
fluorescent tracing- inject _ into a cell, tracer cell will diffuse into the cell and can use to follow it.
Term
Intact systems
Definition
fMRI (functional Magnetic Resonance Imaging)
-live scan that higlights brain activity, blue and purple means not so much brain activity
-statistical composite, subtraction technique where computer takes each pixel and sampled frequently at that point, the computer subtracts the reading of the pixel from the ones around it.
-functional circuits, not localized function
Term
Neurologist vs. neuropsychologist
Definition
Neurologist: physician with MD, can do surgery
neuropsychologist: non-invasive studying of the neural system (no surgery)
Term
commissurotomy
Definition
Separation of the 2 hemispheres, severing the corpus collusum
-only for people with severe epilepsy
Term
PET scan
Definition
measures glucose utilization
Term
Method of adjustment
Definition
Subjects controls the changes in signal or stimulus
Term
Method of Constant Stimuli
Definition
stimulus intensity in which the subject detects the stimulus 50% of the time.
Term
Method of Limits
Definition
ascending and descending, average of switch points between detection of signal
Term
Difference threshold or limen
Definition
amount by which 2 stimuli differ in order to be perceived as different.
-standard and comparison stimulus
-absolute value is based on standard measurement used
Term
Weber's fraction
Definition
K=difference limen (units)/standard (units)
Term
Direct Magnitude estimation
Definition
subjective magnitude
Term
Steven's Power Law
Definition
KS^N, most important factor in changing stimulus and corresponding measurement
Term
light
Definition
electromagnetic radiation within the visible spectrum, photons
Term
neoclassical methods
Definition
semantic differentials: language, words
narrative (phenomenological)- "tell me what you think when you see this"
Term
Signal Detection Theory
Definition
Noise or noise plus signal
ROC: Receiver operating characteristic
Term
Payoff matrix or noise in background
Definition
Affect signal detection
Term
2 most important things for Signal Detection Theory
Definition
Response criterion: (Beta) Subjective intensity required to trigger a "yes" response

Sensitivity: (d') avg. difference between N and S+N in subjective intensity
Term
Conservative Beta: Liberal Beta
Definition
Response criterion is higher: response criterion is lower
Term
When you increase sensitivity (d')...
Definition
the rate of false alarms stays constant
-d'=0 when hits and false alarms are the same
Term
Signal Detection Method
Definition
-Hypothesize about sensitivity and response criterion
-measure or manipulate variables
-run N and S+N trials
-collect "yes" or "no" data for each trial
Term
Measures to plot when doing ROC...
Definition
Hits and false alarms
Term
Most sensitive to movement..
Definition
in the periphery
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