Final Exam Prep Flashcards
What is psychology?
Scientific study of the mind, brain, and behaviour
What are the levels of analysis?
Biological, psychological, social culture influences
What does the biological level of analysis involve?
Study of molecular or neurochemical and involves molecules and brain structure
What is the psychological level of analysis and what does it involve?
Mental or neurological; involves thoughts, feelings, and emotions
What is the social culture influences level of analysis and what does it involve?
Social or behavioral; involves relating to others and personal relationships
Why do interrelated factors make human behaviors difficult to predict?
These make it difficult to determine which factor contributes to the behavior as they could all be playing a role
What are individual differences and why do they make psychology difficult?
- People differ in their thinking, emotion, personality, and behavior
- Makes it different to explain behaviors that apply to everyone
What is reciprocal determination and why does it make psychology difficult?
- We mutually influence each other’s behavior
* Makes it challenging to isolate the causes of human behavior
Why do cultural differences make psychology difficult?
Place limits on generalizations that can be drawn about human nature
What is the emic approach?
Study the behavior of a culture from the perspective of a “native” or insider
What is the etic approach?
Study the behavior of a culture from the perspective of an outsider
What is structuralism?
The elements of the mind.
Aimed to identify basic elements of psychological experience (much like a periodic table) using introspection
Who was the leading figure in structuralism?
Edward Bradford Titchener (student of Wundt)
Why didn’t structuralism work?
Subjective reports and others have imageless thought, the ability to solve problems without a conscious experience
What did we learn from Structuralism?
- Need more than a single method for a complete science
* Importance of systematic observation needed to study conscious experience
What is functionalism?
Psychology meets Darwin.
• Aimed to understand the adaptive purposes of psychological characteristics, such as thoughts, feelings, and behaviours
• Believed we evolved these traits to increase changes of survival and reproduction
Who was the leading figure of functionalism?
William James, influenced by Charles Darwin
What did we learn from functionalism?
Gradually absorbed into mainstream psychology and continues to indirectly influence the science
What is behaviorism?
The laws of learning.
• Uncover the general principles of learning that explain all behaviours
• Focus is largely on observable behaviour
• Looked at rewards and punishments given by the environment
• Sometimes called black box psychology because they believed that we know the input and output from the mind, but didn’t worry about what happens between the two
Who were the leading figures in behaviorism?
John B Watson and B. F. Skinner
Why didn’t behaviourism work?
The neglect of cognition bothered many psychologists
What did we learn from behaviourism?
- One of the first to focus on need for objective research
* Influential in models of human and animal learning
What is cognitivism?
- Thinking is central to understanding behaviour
- Examines the role of mental processes on behaviour
- Believed only looking at rewards and punishments isn’t accurate because the interpretation of them are central to our behaviour
Who were the leading figures of cognitivism?
Jean Piaget and Ulric Neisser
What did we learn from cognitivism?
- Still widely used today to get insight on a persons behaviours
- Cognitive neuroscience is a new field examining the relationship between brain functioning and emotion which will add biological processes to thoughts and feelings
What type of thought called the mind the black box?
Behaviourism
What type of thought was considered opening the black box?
Cognitivism
What is psychoanalysis?
- Uncover role of unconscious psychological processes and early life experiences in behaviour
- Believed primary influences are not rewards and punishments but rather unconscious drives, especially sexuality and aggression
- Believed in the significance of symbols and “Freudian slips”
- Believed core personalities is moulded in the first few years of life
Who was the leading figure of psychoanalysis?
Sigmund Freud
Why didn’t psychoanalysis work?
Many believe it slowed the progress of psychology as a science
What did we learn from psychoanalysis?
Much of our mental process goes on outside of conscious awareness
What is evolutionary psychology?
- Applies Darwin’s theory of natural selection to human and animal behaviour
- Unable to be proven false though
What is determinism?
- The theory that free will is an illusion
- We are not consciously aware of thousands of subtle environmental influences
- Our behaviours are completely determined, caused by preceding influences
What is naïve realism?
- Belief that we see the world precisely as it is
- We assume “seeing is believing”
- We often have our own bias that interferes
What is a scientific theory?
- Explanation for many findings in the natural world
* Ties multiple findings together into one package
What is a hypothesis?
A testable prediction derived from a scientific theory
What is confirmation bias?
- Tendency to seek out evidence that supports our hypothesis and deny, dismiss, or distort evidence that contradicts them
- “You’ll see what you are looking for”
- Biggest bias and we need to strive to contradict it
What is belief perserverance?
- Tendency to stick to our initial beliefs even when evidence contradicts them
- None of us want to believe we are wrong
What are metaphysical claims?
- Assertion about the world that is not testable
- Include existence of God, soul, afterlife etc.
- Cannot be tested using scientific methods
- Doesn’t mean they are wrong or unimportant, they just do not fall in the province of science as they are not testable
What is pseudoscience?
- Set of claims that seems scientific but isn’t
* Lacks the safeguards against confirmation bias and belief perseverance that characterizes science
What does overuse of ad hoc immunizing hypothesis mean?
o Escape hatch or loophole that defenders of a theory use to protect the theory from being disproven
o Makes claims essentially impossible to test
What are the warning signs of pseudoscience?
- Overuse of ad hoc immunizing hypothesis
- Lack of self correction
- Overreliance of anecdotes
- Exaggerated claims
- Absence of connectivity to other research
- Lack of independent reviews
- Meaningless psychobabble
- Talk of proof, not evidence
What is patternicity?
Tendency to detect meaningful patterns in random stimuli
What is the terror management theory?
Proposes our awareness of our death leaves us with an underlying sense of terror and we cope by adopting reassuring cultural world views
What is the emotional reasoning fallacy?
Using our emotions or guides for evaluating the validity of a claim
What is the bandwagon fallacy?
Popular opinion isn’t a dependable way to determine accuracy
What is the not me fallacy?
Believing we are immune to bias
What is the either or fallacy?
Framing a question as if it can be only answered by opposite extremes
What is the appeal to authority fallacy?
Accepting a claim because an authority figure endorses it
What is genetic fallacy?
Confusing correctness of a belief with its origins
What is the argument for antiquity fallacy?
Belief must be accurate because its old
What is the argument from adverse consequences fallacy?
Confusing validity with its real world consequences
What is the appeal to ignorance fallacy?
Must be true because no one has proven it false
What is the naturalistic fallacy?
Inferring moral judgement from a scientific fact
What is the hasty generalization fallacy?
Drawing a conclusion from insufficient evidence
What is the circular reasoning fallacy?
Basing a claim on the same claim reworded in slightly different terms
What is scientific skepticism?
Approach of evaluating all claims with an open mind but insisting on persuasive evidence before accepting them
What is critical thinking?
o Set of skills for evaluating all claims in an open-minded and careful fashion
o Used in psychology as scientific thinking
Name a few logical fallacies.
Emotional reasoning fallacy Bandwagon fallacy Not me fallacy Either or fallacy Appeal to authority fallacy Genetic fallacy Argument for antiquity fallacy Argument from adverse consequence fallacy Appeal to ignorance fallacy Naturalistic fallacy Hasty generalization fallacy Circular reasoning fallacy
What is ruling out rival hypothesis?
Have important alternative explanations for the findings been excluded?
What is correlation vs causation?
Correlation-causation fallacy is the error of assuming that because one thing is associated with another, it must cause the other
What is falsifiability?
o Claim must be capable of being disproved
o Must state in advance what would be against the claim
o The best theories make risky predictions that risk being wrong so that if they are correct it is more likely to be caused by more than just chance
What is replicabilty?
Can results be consistently duplicated
What does extraordinary claims requiring extraordinary evidence mean?
Is the evidence as strong as the claim?
What is Occam’s razor?
Does a simpler answer exist that accounts for all the data?
What are the scientific thinking principles?
- Rule out rival hypothesis
- Correlation isn’t causation
- Falsifiability
- Replicability
- Extraordinary claims require extraordinary evidence
- Occam’s Razor
What is basic research as it applies to psychological research?
Research examining how the mind works
What is applied research as it applies to psychological research?
Research examining how we can use basic research to solve real world problems
Why do we need research designs?
- To avoid being fooled by fallacies and bias
* Avoid putting patients through useless treatments and focus on scientifically proven treatments
What is intuitive thinking and when do we need it?
- Quick, reflexive, mostly hunches
- Brain does this on autopilot
- We need these snap decisions in every day life
What is analytical thinking and when do we need it?
- Slow, reflective, and takes mental effort
- Can override intuitive thinking when “the gut” was wrong
- Good research designs can help prevent us from using intuitive thinking and have us using analytical thinking
What does heuristic means when applied to thinking?
Mental shortcut or rule of thumb that helps us to streamline our thinking and make sense of our world
What is naturalistic observation?
Watching behavior in real world settings without trying to manipulate the situation
What does external validity mean?
The extent to which we can generalize findings to real world settings
What does internal validity mean?
The extent to which we can draw cause-and-effect inferences from a study
What are the advantages to naturalistic observation?
High external validity
What are the disadvantages to naturalistic observation?
- Low internal validity
- We are unable to change the variables
- Unable to infer causation
- Must wait for right situation
- If subjects are aware they are being observed, it can affect their behavior
What are case studies?
Examines one person, or a small number of people in depth, often over an extended period of time
What are advantages to case studies?
- Can provide existence proofs
- Valuable with rare or unusual phenomena that are difficult or impossible to re-create
- Can give a basis for further hypothesis and later systematic testing
What is an existence proof?
Demonstration that a given psychological phenomenon can occur
What are disadvantages to case studies?
- Are typically anecdotal
- Unable to infer causation
- Rival hypotheses are not able to be ruled out
- Unable to determine if case generalizes in a population beyond the single case
What are self report measures and what can they assess?
o Often called questionnaires
o Assesses variety of characteristics, such as personality traits, mental illness, and interests
What is a survey?
Typically used to measure people’s opinions and attitudes
What is random selection?
o Procedure that ensures that every person in a population has an equal chance of being chosen to participate
o Critical to generalize results to broader population
What is reliability when it comes to research?
o Refers to consistency of measurement
o Should be able to repeat the test with the same results
What is interrater reliability when it comes to research?
Degree different people agree on the characteristics being measured
What is validity as it applies to research?
o Extent to which a measure assesses what it purports to measure
o Reliability is necessary for validity, but does not guarantee validity
What are some advantages to self reporting and surveys?
- Easy to administer
* Self reporting of personality traits and behaviours work relatively well
What are some disadvantages to self report measures and surveys?
- Assumes participants have enough insight into their personality characteristics to report them accurately
- Response sets (people distorting their responses)
- When asking people to evaluate others (such as job performance), there are 2 pitfalls halo and horns effects
What is response sets when it comes to questionnaires and surveys and how can we manage it?
o Tendency of research participants to distort their responses (good or bad) to questionnaire items
o Can ask several questions that measure these tendencies and use this to compensate for this in clinical practice or research
What is the halo effect?
Tendency of ratings of one positive trait to influence other characteristics
What is the horns effect?
Tendency of one negative trait to influence ratings of other characteristics
What are correlational research designs?
- Examines the extent to which two variables are associated
* Can be positive (same direction), negative (opposite direction), zero (no correlation)
What is the correlation coefficient?
o The statistics that psychologists use to measure correlations
o Range between -1.0 (perfect negative) and 1.0 (perfect positive)
What are advantages to correlational designs?
• Can help predict behavior or future patterns
What are disadvantages to correlational designs?
- Unable to infer causation
* Illusory compensation (perception of correlation where none exists)
What is illusory compensation?
o Perception of a statistical associate between two variables where none exists
o Provides need to calculate correlations rather than relying on our own eyes
o Our intuitions mislead us, especially when we’ve learned to expect two things to go together
What is the between-subjects experimental design?
o Random assignments into experimental or control groups
o Need to ensure that control group believes they are getting treatment (placebo)
What is the within-subject experimental design?
o Each participant acts of their own control
o Participants are measured before and after the manipulation
What is the independent variable?
Variable that the experimenter manipulates
What is the dependent variable?
Variable that the experimenter measures to see whether this manipulation has had an effect
What is the operational definition of an experimental design?
A specific definition of what’s being measured
What is the confounding variable in an experimental design?
Any difference in variables between experimental and control groups that isn’t the independent variable
What is the placebo effect?
o Improvement resulting from the mere expectation of improvement
o We need to be aware of this and ensure both groups are equally likely to experience it
What is a blind experimental design?
o Unaware of whether one is in the experimental or control group
o If patients are not blind, the experiment is essentially ruined
What is a double blind experimental design?
o Experiment in which neither researchers nor participants are aware of who is in the experimental or control group
o Safeguards against confirmation bias and experimenter expectancy effect
What is the nocebo effect?
Expectation of harm that results in harm (voodoo)
What is the experimenter expectancy effect?
o Also called the Rosenthal effect
o Researchers’ hypotheses lead them to unintentionally bias the outcome of a study
o Affects results in subtle ways, almost outside of their knowledge
o Researchers can fall prey to confirmation bias
What is demand characteristics of an experimental design?
o Cues that participants pick up from a study that allow them to generate guesses regarding the researcher’s hypotheses
o Experimenters may use a cover story or distractor items on a survey
What is the advantage of experimental designs?
Allows us to infer causation
What are the disadvantages to experimental design?
Can be low in external validity
Who provides ethical guidelines for researchers?
Research Ethics Board
What is informed consent?
Participants must be aware of what is involved in a study prior to asking them to participate
When is deception justified in research designs?
o Study cannot be performed without the deception
o Does not negatively affect rights of the participant
o Does not involve a medical or therapeutic intervention
What is a debriefing?
Researchers tell participants about full experiment including deceptions and what was learned
Who’s guidelines must be followed for the use of animals in research?
Canadian Council on Animal Care (CCAC)
What are statistics?
Application of mathematics to describing and analyzing data
What are descriptive statistics?
Numerical characterizations that describe data
What is the central tendency?
Measures of the “central” scores in a data set or where the group tends to cluster
What are the three measures for central tendency?
Mean, median, and mode
What is the mean?
Average, total score divided by the number of people
What is the median?
Actual middle score of a data set
What is the mode?
Most frequent score in a data set
What is the variability in statistics?
Measure of how loosely or tightly bunched scores are; sometimes called dispersion
What is the range?
o Simplest measure of variability
o Difference between the highest and lowest scores
o Can be deceptive as it doesn’t share the distribution of scores in the range
What is standard deviation?
Average amount that each data point is from the mean rather than just the range
More difficult to calculate but less deceiving than simple range
What is inferential statistics?
Mathematical methods that allow us to determine whether we can generalize findings from our sample to the full population
What is statistical significance?
- When the finding would have occurred by chance less than 5 in 100 times
- The larger the sample, the greater the odds that a result will be statistically significant
What is the practical significance?
- Real world importance
* Just because it’s statistically significant does not mean that it makes any difference in the real world
What is the base rate when looking at statistics?
How common a characteristic or behaviour is in the general population
What is balanced coverage when discussing evaluating psychological research?
Try to cover both sides using “experts” and can create pseudosymmetry, the appearance of scientific controversy where none exist
What are glial cells?
- Carry away debris
* Are a support cell for neurons
What is an astrocyte?
- Communicate closely with neurons
- Control blood flow in brain
- Intimately involved in thought, memory, and immune system
- Play a role in blood brain barrier
What is an oligodendrocyte?
- Promotes new connections among nerve cells
- Releases chemicals to aid in healing
- Produces myelin sheath
What is the resting potential?
No neurotransmitters acting on neurons
What is the threshold level for neurons?
Membrane potential necessary to trigger an action potential
What is an action potential?
Electrical impulse travels down the axon and triggers release of neurotransmitters
What law does an action potential follow?
All or nothing law
What is a graded potential?
Post synaptic potentials that can be excitatory or inhibitory depending on whether + or – charged particles flow across the neuronal membrane and in which direction they flow
What is an excitatory postsynaptic potential and what is it caused by?
- Graded potential in a dendrite that is caused by excitatory synaptic transmission
- Caused by positive ions
What is an inhibitory postsynaptic potential and what is it caused by?
- Graded potential in a dendrite that is caused by inhibitory synaptic transmission
- Caused by negative ions
What is long term potentiation?
- Neurons mechanism for memory and basis for our memories
- Occurs when graded potential becomes larger than it was prior to stimulation
- Increases ability of neuron to communicate and fire action potentials
What is a neurotransmitter?
o Chemical event allowing communication among neurons
o Can be excitatory of inhibitory
o Each has something different to say
What is a receptor site?
o Location that recognizes a neurotransmitter
o Different receptors recognize different neurotransmitters (lock and key analogy)
What is reuptake?
Presynaptic axon reabsorbs the neurotransmitter and halts further transmission
What is the main excitatory neurotransmitter in the CNS?
Glutamate
What is the main inhibitory neurotransmitter in the CNS?
Gamma-Aminobutyric Acid (GABA)
What is glutamate associated with?
Learning and memory
What are elevated levels of glutamate related to?
o Schizophrenia and other mental health disorders
o Damage to receptors due to overstimulation
What does glutamate interact with?
Alcohol and memory enhancers
What does GABA play a role in?
Learning, memory and sleep
What does GABA interact with?
o Alcohol
o Anti-anxiety drugs suppressing overactive brain areas linked to worry
What does GABA stand for?
Gamma-Aminobutyric Acid
What does ACh stand for?
Acetylcholine
What is ACh associated with?
- Work in muscle contraction in PNS
- Affects cortical arousal in CNS
- Plays role in arousal, selective attention, sleep, and memory
What happens to ACh receptors in Alzheimer’s disease?
Neurons containing acetylcholine (and others) are progressively destroyed
What does ACh interact with?
o Nicotine stimulates ACh receptors
o Memory enhancers increase ACh
o Insecticides block the breakdown of ACh, resulting in violent, uncontrolled movements that kills the bugs
o Botox causes paralysis by blocking ACh release
What are the monoamines?
Norepinephrine, dopamine, and serotonin
What is norepinephrine associated with?
Brain arousal and other functions like mood, hunger, and sleep
What does norepinephrine interact with?
Amphetamine and methamphetamine increase NE
What is dopamine associated with?
Motor function and reward
What does dopamine interact with?
L-Dopa increases dopamine, used to treat Parkinson’s disease
Antipsychotic drugs which block dopamine action are used to treat schizophrenia
Amphetamine and methamphetamine increase dopamine
What is serotonin associated with?
o Mood and temperature regulation, aggression, and sleep cycles
What does serotonin react with?
Serotonin-selective reuptake inhibitor (SSRI) antidepressants used to treat depression
Amphetamine and methamphetamine increase serotonin
Which neurotransmitter binds to the same receptors as THC?
Anandamide
What is anandamide associated with?
- Plays roles in eating, motivation, memory, and sleep
* Plays a role in pain reduction
What type of neurotransmitter is endorphins?
Neuropeptides
What is endorphins associated with?
o Play a role in pain reduction
o Opioids hijack the endorphin receptors
What are psychoactive drugs and what do they affect?
o Drugs that interact with neurotransmitter systems
o Affect mood, arousal, or behaviour
What is an agonist?
•Increase receptor site activity
What is an antagonist?
Decrease receptor site activity
What is neural plasticity?
- Ability of the nervous system to change
- Constantly changing, more in early childhood
- Often cannot change enough to compensate for injury or stroke
What are the 4 primary changes of neural plasticity?
- Growth of dendrites and axons
- Synaptogenesis, the formation of new synapses
- Pruning
- Myelination
What is pruning as it relates to neural plasticity?
o Death of 70% of neurons
o Retraction of axons to remove connections that aren’t useful
o Streamlines neural organization and becomes more efficient
o Autism may be due to inadequate pruning
How does neural plasticity play a role in learning?
- Change results from formation of new synapses and strengthening existing connections
- Develop long term potentiation
What is adult neurogenesis?
- Creation of new neurons in the adult brain
- May play a helpful role in learning
- Studying ability to trigger this to help with recovery
What is a stem cell and what applications do they have in neuroscience?
- A cell, often originating in embryos, having the capacity to differentiate into a more specialised cell
- Implanting stem cells can induce them to grow and replace damaged cells
- May have gene therapy applications as well
What does the fusiform gyrus in the temporal lobe play a role in?
Facial recognition
What is the basal ganglia?
Structures in the forebrain that help to control movement
What is the limbic system?
- Emotional centre of the brain that also plays roles in smell, motivation, and memory
- Processes information about our internal states and emotions
What is the function of the thalamus?
- Works as a sensory relay center
* Sensory information first passes through it, undergoing some initial processing before travelling onto the cortex
What is the function of the hypothalamus?
- Regulates and maintains constant internal bodily states
* Plays roles in hunger, thirst, sexual motivation, emotional behaviours, temperature regulation
What is the function of the amygdala?
- Responsible for excitement, arousal, and fear
* Plays role in fear conditioning
What is the function of the hippocampus?
- Critical role in memory, especially spatial memory
- Evidence suggests this area can change size following learning
- Damage causes issues forming new memories while leaving old memories intact
What is the reticular activating system?
Reticular Activating System
• Connects to forebrains and cerebral cortex
• Plays important role in arousal
• Damage can result in coma
What is the function of the pons?
Crucial role in triggering dreams
Connects cortex to cerebellum
What is the function of the medulla?
Regulates breathing, heartbeat, and other vital functions
Controls nausea and vomiting
Serious damage can cause brain death, and irreversible coma
What is the “master gland” of the body?
Pituitary gland
What is phrenology?
Belief that bumps on the head contribute to intelligence and personality
What is a CT scan?
• Computed tomography (CT)
o 3D reconstruction of multiple x-rays taken through a part of the body
o Displays more detail than an individual x-ray
What is an MRI?
• Magnetic resonance imaging (MRI)
o Shows structural detail and superior to CT for soft tissues
o Measures release of energy from hydrogen atoms in biological tissues following exposure to a magnetic field
What is a PET test?
- Positron emission tomography (PET
- Measures changes in brains activity in response to stimuli
- Injection of radioactive glucose like molecules, scanner measures where in the brain most of these are consumed as neurons increase glucose consumption when they are active
What is an fMRI?
- Functional MRI
* Measures changes in blood oxygen levels as oxygen demands increase as activity increases
What is Transcranial Magnetic Stimulation (TMS)?
- Applies strong and quickly changing magnetic fields to the skull to create electric fields in the brain
- Can enhance or interrupt brain function in specific regions depending on level of stimulation
What is Magnetoencephalography (MEG)?
- Detects electrical activity by measuring tiny magnetic fields
- Measures activity changes millisecond to millisecond
What is localization of function as it comes to neuroscience?
Brain areas identified as active during specific psychological tasks over a baseline rate of activity
What is lateralization as it applies to neuroscience?
o Cognitive function that relies more on one side of the brain than the other
o Many of these functions concern specific language and verbal skills
What is split brain surgery?
o Procedure that involves severing the corpus callosum to reduce the spread of epileptic seizures
o Rare operation that is no longer performed
What is heritability in respect to behavioural genetics?
o Extent to which genes contribute to differences in a trait among individuals
o Typically expressed as a percentage
o So if it’s 40% heritable, than 40% is genes and 60% is environment
What is behavioural genetics?
Examines influence of nature and nurture on psychological traits
What are examples of behavioural genetic designs?
Family studies, twin studies, and adoption studies
What is a family study?
- Researchers examine the extent to which a characteristic runs in an intact family
- Doesn’t allow environments to be ruled out
What is a twin study?
- Analysis of how traits differ in identical versus fraternal twins
- Would assume that environment for the twins is the same so allows us to see the genetic differences in fraternal twins
What are adoption studies?
Examines the extent to which children adopted resemble their adoptive as opposed to their biological parents
What is sensation?
Detection of physical energy by sense organs, which then send information to the brain
What is perception?
• The brains interpretation of raw sensory inputs
What is an illusion as it pertains to sensation and perception?
• Perception in which the way we perceive a stimulus doesn’t match its physical reality
What is filling in as it pertains to sensation and perception?
- Occurs entirely without our awareness
- Usually adaptive and helps us make sense of our world
- We use available information to make sense of what’s missing
What is transduction?
• Process of converting an external stimulus into electrical activity within neurons
What is a sensory receptor?
• Specialised cell responsible for converting external stimuli into neural activity for a specific sensory system
What is sensory adaptation?
- Activation is greatest when stimulus is first detected
- Declines in strength after
- Occurs at level of receptor
What is psychophysics?
• Study of how we perceive sensory stimuli based on their physical characteristics
What is the absolute threshold as it pertains to sensation?
- Lowest level of a stimulus needed for the nervous system to detect a change of 50% of the time
- Demonstrates how sensitive our sensory systems are
- Human error increases as stimuli become weaker
What is the just noticeable difference (JND)?
- Smallest change in the intensity of a stimulus that we can detect
- Ability to distinguish strong from weak stimuli
What is Weber’s Law?
o Principle stating there is a constant proportional relationship between the JND and original stimulus intensity
o Basically, the stronger the stimulus, the bigger the change needed for a change in stimulus intensity to be noticeable
What is the signal detection theory?
• Theory regarding how stimuli are detected under different conditions
What is the signal to noise ration as it pertains to the signal detection theory?
o How much the signal needs to be increased to be heard over background noise
What is the response bias as it pertains to the signal detection theory?
o Tendencies to make one type of guess over another when we’re in doubt about whether a weak signal is present or absent under noisy conditions
What is the McGurk effect as it pertains to sensation?
o We integrate visual and auditory information when processing spoken language and our brain automatically calculates the most probably sound given the information between the 2 sources
What is the rubber hand illusion?
o Touch and sight can interact to create a false perceptual experience
What is synesthesia?
o Rare condition in which people experience cross-modal sensations
o Shows up lots in children but no longer present in adults
What is selective attention?
• Process of selecting one sensory channel and ignoring or minimizing others
What part of the brain is main brain region involved in selective activation?
Selective attention
What is the filter theory of attention?
o Views attention as a bottleneck through which information passes
o Allows us to pay attention to important information and ignore others
What is the cocktail party effect?
o Allows us to pick out important information when we are not actively paying attention, like someone saying your name across the room at a party
What is inattentional blindness?
- Failure to detect stimuli that are in plain sight when our attention is focused elsewhere
- The gorilla in the basketball game study
What is change blindness as it relates to attention?
Failure to detect obvious changes in one’s environment
What is the trichromatic theory?
Idea that colour vision is based on our sensitivity to three primary light colours
What is the opponent process theory?
Theory that we perceive colours in terms of 3 pairs of opponent colours
o Red or green
o Blue or yellow
o Black or white
What theory explains after images? (the ones that remain after we stare at a colour for a long time and look away)
Opponent Process Theory
What is blindness?
- Dramatic reduction in ability to see
* Less than or equal to 20/200