psy unit 2 notes.docx

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Psychological & Brain Sciences
CAS PS 101
David Sullivan

CHAPTER 7 Memory: capacity of the nervous system to acquire and retain usable skills and knowledge, allowing living organisms to benefit from experience Encoding: processing of info so it can be stored Storage: retention of encoded representations over time that corresponds to some change in the nervous system that registers the events Retrieval: recovering info from memory stores when it is needed MEMORY MODEL Sensory Memory – separate sensory-memory store for each sensory system Visual – iconic memory Auditory – echoic memory Persists for about 1/3 of a sec and then progressively fades Attention - info that has been attended to is passed from sensory stores to short-term memory Short-term Memory/Working memory Active processing of info for current use Capacity: limited – 7 +/- 2 Duration: short (~20s) Amount of info that flows through is large Chunking – process of grouping distinct bits of info into larger wholes to increase short-term memory capacity Serial-position effect: tendency to recall more items from the beginning and end of a list than from the middle Primacy and recency: good recall of first and last items Long-term memory Explicit memory - Declarative (conscious): stored long term knowledge of facts about ourselves and the world Semantic (nonpersonal) – facts and general knowledge Episodic (personal) – specific events Implicit memory – non-declarative (nconscious): stored long term knowledge of learned habits and skills Procedural memory: learned habits and skills Conditioning effects: ex. classical and operant conditioning Amnesiacs perform poorly on explicit memory tasks, but implicit task similar to control subjects Semantic network: complex web of semantic associations that link items in memory such that retrieving one item triggers retrieval of others as well Priming: exposure to stimulus influences response to a later stimulus Conceptual priming: when priming stimulus influences your flow of thoughts; activates concepts stored in semantic memory Perceptual priming: when priming stimulus enhances ability to identify a test stimulus based on its physical features Priming is implicit b/c you don’t need to consciously recall seeing priming stimulus in order for priming to occur Amnesia Anterograde amnesia: inability to store new info Retrograde amnesia: inability to retrieve memories from the past Patient HM – severe seizures so hippocampus removed; could not form any new memories Short term memory in tact; anterograde amnesia Procedural memory in tact; declarative memory – none Implicit memory – did learn some new tasks with no explicit memory of task Misinformation effect: tendency for post-event misinformation to become integrated into memory of an event Loftus & Palmer (1974) participants view film of automobile accident and asked how fast cars were using diff verbs, answers changed Loftus & Zanni (1975) Did you see a broken headlight vs did you see the broken headlight Innocence Project – post-conviction DNA testing yields proof of innocence EYEWITNESS TESTIMONY Eyewitnesses are imperfect Certain personal and situational factors systematically influence eyewitness’ performance Judges, juries, and lawyers are not well informed about these factors Acquisition – refers to witness’s perceptions at time of event in question Factors influencing acquisition Emotional state Weapon-focus effect Cross-race identification bias Storage – memory for faces and events tend to decline over time Purity of memory can be influenced by postevent info Ex. misinformation effect Retrieval – pulling the info out of storage when needed Factors affecting identification performance Lineup construction Lineup instructions to the witness Format of the lineup Familiarity-induced biases DRM List – when giving a list of words relating to one thing, ppl think related word was in list Ex. whiskers, pur, fur; ppl think cat was on list Theory: spreading activation Model for association of ideas and memories that is based on activating one memory will trigger associated items ATTENTION Human info processing system limited in terms of allocation of resources to sensory and perceptual info Attention refers to allocation of processing resourcesAND to concentration and focusing of mental effort (focus is selective, shiftable, divisible) VOLUNTARYATTENTION (endogenous): intentionally attend to something REFLEXIVEATTENTION (exogenous): attention captured by a sensory event Selective attention: focusing on specific objects and filtering out others Cocktail party effect –Ability to attend selectively to one person’s speech in midst of competing conversations Dichotic listening cherry – made to listen to two messages and repeat words of one message Divided attention: ability to distribute one’s attention and simultaneously engage in two or more activities Visual search Parallel processing: processing mult types of info at same time Targets: objects that differ from others in only one feature Distractors: other objects in the display Conjunction tasks are serial and effortful Inattentional blindness: failure to notice a fully-visible but unexpected object because attention engaged on another thing Change blindness: failure to notice large changes in ones environment Schema: organized pattern of thought or behavior CHAPTER 8 Problem: wanting to reach a certain goal but solution is not immediately obvious 1. initial state 2. goal state 3. obstacles Well defined problems: clear path to the solution Ill defined problems: dimensions of problem are not specified or easy to infer STRATEGIES Algorithm: systematic problem solving procedure that is guaranteed to produce a solution; based on a set of rules Heuristic: mental shortcut based on prior experiences; allows one to make judgments that are quick but often in error Obstacles Functional fixedness: restricting use of an object to its familiar functions Mental set: use of problem solving strategies that have worked in the past Unnecessary constraints – ex. 9 dot problem Insight – sudden discovery of correct solution following incorrect attempts based on trial and error Expertise: superior skills/achievement reflecting well-developed and well-organized knowledge base Experts solve problems in their field faster and better and posses more knowledge Knowledge organized so that it can be accessed when needed to work on a problem Novice: surface features Expert: deep structure Better schemas, well organized knowledge, less time to set up problem, more appropriate strategies, faster at solving and more accurate than novices Creativity: Innovative thinking, novel ideas, and new connections between existing ideas Strategy formation Divergent thinking: generate mult solutions to problem Convergent thinking: narrow down to best answer Organization of info – aids solution(symbols, matrixes, diagrams) JUDGMENTAND DECISION MAKING Availability heuristic: mental shortcut that occurs when people make judgments about probability of events by how easy it is to think of examples Representative heuristic: used when making judgments about probability of an event under uncertainty Confirmation bias: tendency to take evidence that’s consistent with your beliefs more seriously than evidence inconsistent with your beliefs LANGUAGE Human system of communication Use of organized means of combining words in order to communicate Birth of a language – needs ‘community’ Language acquisition Babbling to single words to two word stage to complex grammatical structures Unconsciously simplified speech when baby was babbling After first word started more complex sentences Aspects of language Phoneme: smallest unit of speech; basic distinct sounds Ex. tip: t-i-p; ship: sh-i-p Morpheme: smallest unit that carries meaning Ex. unthinkable: un-think-able Prefix, root word, suffix Lexicon: entire set of morphemes in a given language Avg English speaker has about 80,000 Syntax: rules that govern the arrangement of words and phrases in a sentence Semantics: property of language that accounts for the communication of meaning Phrase: group of words that act as a unit to convey meaning; combo of morphemes Sentence: organized sequence of words Discourse: convo; paragraph; story Properties of language Communicative Arbitrarily symbolic: no visual similarity to sound Structured at multiple levels(sounds, meaning, phrases, etc) Generative: ability to originate, produce or procreate Dynamic: const
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