memory and cognition psy 324 topic: problem solving dr. ellen campana arizona state university
TRANSCRIPT
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Memory and Memory and CognitionCognition
PSY 324PSY 324
Topic: Problem SolvingTopic: Problem Solving
Dr. Ellen CampanaDr. Ellen Campana
Arizona State UniversityArizona State University
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OutlineOutline
The Gestalt Approach:The Gestalt Approach: Describe problem solving as involving Describe problem solving as involving
a process called a process called restructuringrestructuring.. The Information-processing The Information-processing
Approach:Approach: Describe problem solving as involving Describe problem solving as involving searchsearch..
Analogies:Analogies: A method that combines elements of A method that combines elements of
both restructuring and search.both restructuring and search. Experts and nonexperts:Experts and nonexperts: Creative thinking:Creative thinking:
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Gestalt ApproachGestalt Approach
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What Is a Problem?What Is a Problem? A problem occurs when there is an obstacle A problem occurs when there is an obstacle
between a present state and a goal, and it is not between a present state and a goal, and it is not immediately obvious how to get around the immediately obvious how to get around the obstacle (Lovett, 2002).obstacle (Lovett, 2002). Well-defined problemsWell-defined problems: usually have a correct answer : usually have a correct answer
and there are certain procedures that will lead to a and there are certain procedures that will lead to a solution.solution.
e.g. a math or physics probleme.g. a math or physics problem Ill-defined problems: Ill-defined problems: do not necessarily have one do not necessarily have one
“correct” answer and the path to the solution is often “correct” answer and the path to the solution is often unclear.unclear.
e.g. dealing with relationships or picking a careere.g. dealing with relationships or picking a career
Think of some problems you have solved or Think of some problems you have solved or are currently working on. are currently working on.
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Gestalt ApproachGestalt Approach
How problems are represented in a How problems are represented in a person’s mind:person’s mind: How people represent a problem in How people represent a problem in
their mind?their mind? How solving a problem involves a How solving a problem involves a reorganizationreorganization or or restructuringrestructuring of this of this representation.representation.
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Representing a Problem in Representing a Problem in the Mindthe Mind
The solution is obtained by first The solution is obtained by first perceiving the object and then perceiving the object and then representing it in a different way.representing it in a different way. Restructuring: the process of changing Restructuring: the process of changing
the problem’s representation.the problem’s representation.
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Circle ProblemCircle Problem If the If the
length of length of the radius the radius is is rr, what , what is the is the length of length of line line xx??
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Insight in Problem Insight in Problem SolvingSolving
Associate with restructuringAssociate with restructuring A sudden realization of a problem’s A sudden realization of a problem’s
solutionsolution Insight is reflected in the types of Insight is reflected in the types of
problems they posed.problems they posed. The solution involves discovering a The solution involves discovering a
crucial element that leads to solution crucial element that leads to solution of the problem (Dunbar, 1998).of the problem (Dunbar, 1998).
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Metcalfe and Wiebe Metcalfe and Wiebe (1987)(1987)
Goal: to distinguish between insight Goal: to distinguish between insight problems and noninsight problems.problems and noninsight problems.
Starting point: there should be a basic Starting point: there should be a basic difference between how participants feel difference between how participants feel they are progressing toward a solution as they are progressing toward a solution as they are working on an insight problem, they are working on an insight problem, and how they feel as they are working on and how they feel as they are working on a noninsight problem.a noninsight problem.
Insight problems, noninsight problems, Insight problems, noninsight problems, and ‘warmth’ judgments every 15 secondsand ‘warmth’ judgments every 15 seconds
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Insight ProblemInsight Problem
Triangle ProblemTriangle Problem How you can move three of the How you can move three of the
circles to get the triangle to circles to get the triangle to point to the bottom.point to the bottom. Chain ProblemChain Problem
To open a link costs 2 cents and To open a link costs 2 cents and to close a link costs 3 cents. to close a link costs 3 cents. How to join the pieces into a How to join the pieces into a single closed loop of chain with single closed loop of chain with 15 cents?15 cents?
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Noninsight ProblemsNoninsight Problems
Algebra problemAlgebra problem Slove for Slove for xx: (1/5): (1/5)xx + 10 = 25 + 10 = 25 Factor 16Factor 16yy22 – 40 – 40 yzyz + 25 + 25 zz22
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ResultsResults
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Obstacles to Problems Obstacles to Problems SolvingSolving
Fixation: people’s tendency to focus Fixation: people’s tendency to focus on a specific characteristic of the on a specific characteristic of the problem that keeps them from problem that keeps them from arriving at a solution.arriving at a solution. Functional fixedness (Jansson & Simth, Functional fixedness (Jansson & Simth,
1991)1991) Candle Problem (Duncker, 1945)Candle Problem (Duncker, 1945) Two-string problem (Maier, 1931)Two-string problem (Maier, 1931)
Situationally produced mental setSituationally produced mental set Water-jug problem (Luchins, 1942)Water-jug problem (Luchins, 1942)
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Candle ProblemCandle Problem
Some candles, matches in a matchbox, Some candles, matches in a matchbox, and some tacksand some tacks
To mount a candle on the corkboard so To mount a candle on the corkboard so it will burn without dripping wax on the it will burn without dripping wax on the floor.floor.
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Adamson (1952)Adamson (1952)
Repeated Duncker’s Repeated Duncker’s exeprimentexepriment
Participants who were Participants who were presented with empty presented with empty boxes were twice as boxes were twice as likely to solve the likely to solve the problem as participants problem as participants who were presented who were presented with boxes that were with boxes that were used as containers.used as containers.
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Two-string ProblemTwo-string Problem
Two separate Two separate strings that strings that were hanging were hanging from the ceilingfrom the ceiling
A chair and a A chair and a pair of plierspair of pliers
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Water-jug ProblemWater-jug Problem Participants were Participants were
given three jugs of given three jugs of different capacities different capacities and were required to and were required to use these jugs to use these jugs to measure out a measure out a specific quantity of specific quantity of waterwater
B - A – 2C works for B - A – 2C works for all of the problemsall of the problems
Fewer steps A + C Fewer steps A + C for problem 7 and A- for problem 7 and A- C for problem 8C for problem 8
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ResultsResults
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Information Information Processing Processing ApproachApproach
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Modern Research on Modern Research on Problem SolvingProblem Solving
Describe problem solving as a Describe problem solving as a search that occurs between the search that occurs between the posing of the problem and its posing of the problem and its solution.solution.
Design computer program to Design computer program to simulate human problem solving.simulate human problem solving.
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Newell and Simon’s Newell and Simon’s ApproachApproach
Initial state: conditions at the beginning Initial state: conditions at the beginning of the problem.of the problem.
Goal state: the solution of the problem.Goal state: the solution of the problem. Operators: rules that specify which moves Operators: rules that specify which moves
are allowed and which are not.are allowed and which are not. Intermediate state: each step through Intermediate state: each step through
problem solving.problem solving. Problem space: initial state, goal state, Problem space: initial state, goal state,
and all the possible intermediate states and all the possible intermediate states for a particular problem.for a particular problem.
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Tower of Hanoi ProblemTower of Hanoi Problem
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Means-end AnalysisMeans-end Analysis
Primary goal: to reduce the Primary goal: to reduce the difference between the initial and difference between the initial and goal statesgoal states
Method: creating intermediate Method: creating intermediate states that are closer to the goal states that are closer to the goal (subgoals).(subgoals).
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How a Problem Is StatedHow a Problem Is Stated
How a problem is stated can affect How a problem is stated can affect its difficulty.its difficulty. Acrobat ProblemAcrobat Problem Reverse Acrobat ProblemReverse Acrobat Problem
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Acrobat ProblemAcrobat Problem
Kotovsky and Coworkers (1985)Kotovsky and Coworkers (1985)
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Reverse Acrobat ProblemReverse Acrobat Problem Same as the acrobat problem, except rule 4 Same as the acrobat problem, except rule 4
was changed to state that a smaller acrobat was changed to state that a smaller acrobat could not stand on a larger one.could not stand on a larger one.
An average 9.51 minutes to solve instead of An average 9.51 minutes to solve instead of 5.63 minutes in acrobat problem.5.63 minutes in acrobat problem.
Reasons for the difficultyReasons for the difficulty A 400-pound acrobat standing on the shoulders A 400-pound acrobat standing on the shoulders
of a 40-pound acrobat is not consistent with our of a 40-pound acrobat is not consistent with our knowledge of the real world.knowledge of the real world.
Visualizing larger acrobats on top of smaller Visualizing larger acrobats on top of smaller ones would increase the load on the problem-ones would increase the load on the problem-solver’s memory.solver’s memory.
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Mutilated –Checkerboard Mutilated –Checkerboard ProblemProblem
Kaplan and Simon (1990)Kaplan and Simon (1990) If we eliminate two corners of the If we eliminate two corners of the
checkerboard, can we now cover the checkerboard, can we now cover the remaining squares with 31 dominos?remaining squares with 31 dominos?
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Mutilated –Checkerboard Mutilated –Checkerboard Problem (Cont.)Problem (Cont.)
blankblank colorcolor black and black and
pink pink bread and bread and
butterbutter
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Mutilated –Checkerboard Mutilated –Checkerboard Problem (Cont.)Problem (Cont.)
Results: Results: The board that emphasized the difference The board that emphasized the difference
between adjoining squares was easier.between adjoining squares was easier. Participants in the bread-and-butter Participants in the bread-and-butter
group solved the problem twice as fast as group solved the problem twice as fast as those in the blank group and required those in the blank group and required fewer hintsfewer hints
Solving problem becomes easier when Solving problem becomes easier when information is provided that helps information is provided that helps point people toward the correct point people toward the correct representation of the problem.representation of the problem.
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Think-Aloud ProtocolThink-Aloud Protocol
Goal:Goal: To determine what information the person To determine what information the person
is attending to while solving a problem.is attending to while solving a problem. To reveal shifts in representation To reveal shifts in representation
ProcedureProcedure Talk aloud while you solve a problem (just Talk aloud while you solve a problem (just
verbalizing what you would normally think)verbalizing what you would normally think) Analysis of what was saidAnalysis of what was said
Russian Marriage ProblemRussian Marriage Problem
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Russian Marriage Russian Marriage ProblemProblem
A “story” version of the mutilated A “story” version of the mutilated checkerboard problem that makes the checkerboard problem that makes the answer obviousanswer obvious 32 bachelors & 32 unmarried women32 bachelors & 32 unmarried women 2 of the men got into a fight and died2 of the men got into a fight and died Can matchmakers still arrange all the Can matchmakers still arrange all the
(hetero) marriages?(hetero) marriages? When people read this story first they can When people read this story first they can
easily solve the checkerboard problem if easily solve the checkerboard problem if they notice there is a connection…they notice there is a connection…
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AnalogiesAnalogies
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Analogical Problem Analogical Problem SolvingSolving
Often you can use the solution of one Often you can use the solution of one problem to guide the solution of another problem to guide the solution of another similar problemsimilar problem Russian Marriage Problem -> Checkerboard Russian Marriage Problem -> Checkerboard
ProblemProblem Analogical TransferAnalogical Transfer
People try to solve the Target ProblemPeople try to solve the Target Problem Some are presented with a Source Problem or Some are presented with a Source Problem or
Source Story that can help them solve the TargetSource Story that can help them solve the Target Russian Marriage (Source) -> Checkerboard Russian Marriage (Source) -> Checkerboard
(Target)(Target)
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Steps of Analogical Steps of Analogical Problem SolvingProblem Solving
Noticing Noticing Seeing that there is a possible analogy Seeing that there is a possible analogy
between problemsbetween problems Most difficult, especially in the real worldMost difficult, especially in the real world
MappingMapping Connecting elements of the source Connecting elements of the source
problem to elements of the target problemproblem to elements of the target problem ApplyingApplying
Using the analogy to generate the solutionUsing the analogy to generate the solution
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Improving Analogical Improving Analogical TransferTransfer
Two types of features (best when Two types of features (best when similar)similar) Structural FeaturesStructural Features Surface FeaturesSurface Features
Analogical EncodingAnalogical Encoding Strategy for training people to be able Strategy for training people to be able
to notice and apply analogies to notice and apply analogies Compare different source problems Compare different source problems
first, then solve Targetfirst, then solve Target
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Analogical ParadoxAnalogical Paradox
Lab studies: People use surface Lab studies: People use surface featuresfeatures
Real World / In Vivo: People use Real World / In Vivo: People use structural featuresstructural features
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Experts and Non-Experts and Non-expertsexperts
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Differences Between Differences Between Novices and ExpertsNovices and Experts
Experts have more knowledge about their Experts have more knowledge about their fieldfield More analogies / strategies possibleMore analogies / strategies possible
Experts’ knowledge is organized differentlyExperts’ knowledge is organized differently Deep structural features Deep structural features physics problem examplephysics problem example
Experts spend more time analyzing Experts spend more time analyzing problemsproblems
BUT experts are only experts in their fieldBUT experts are only experts in their field
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Creative Creative Problem-SolvingProblem-Solving
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A StoryA Story
Physics exam question: Describe Physics exam question: Describe how the height of a building can be how the height of a building can be measured using a barometermeasured using a barometer
Teacher wanted an explanation Teacher wanted an explanation using principles in class using principles in class Compare barometric pressure at the top Compare barometric pressure at the top
of the building with barometric of the building with barometric pressure at the groundpressure at the ground
Equation to find the building’s heightEquation to find the building’s height
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A StoryA Story
One student’s answersOne student’s answers Lower the barometer to the ground on a piece Lower the barometer to the ground on a piece
of string – length of string is height of buildingof string – length of string is height of building Put barometer in the sun and measure the Put barometer in the sun and measure the
length of its shadow and the length of the length of its shadow and the length of the building’s shadow, use proportions to find building’s shadow, use proportions to find building heightbuilding height
Give the building superintendent the barometer Give the building superintendent the barometer in exchange for info about building heightin exchange for info about building height
These are examples of These are examples of creativecreative answers answers
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What is creativity?What is creativity?
Difficult to defineDifficult to define Involves innovative thinking, Involves innovative thinking,
generating novel ideas, or making generating novel ideas, or making new connections between existing new connections between existing ideas to create something newideas to create something new
Involves Involves divergent thinkingdivergent thinking
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Divergent vs. Convergent Divergent vs. Convergent ThinkingThinking
Divergent thinking Divergent thinking Open-endedOpen-ended Large number of potential “solutions” Large number of potential “solutions” No “correct” answerNo “correct” answer Associated with ill-defined problemsAssociated with ill-defined problems
Convergent thinkingConvergent thinking Finding a solution to a specific problemFinding a solution to a specific problem Thinking converges to the correct Thinking converges to the correct
solutionsolution Associated with well-defined problemsAssociated with well-defined problems
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Fixation and CreativityFixation and Creativity
Earlier we talked about Gestalt Earlier we talked about Gestalt psychologists’ research on obstacles to psychologists’ research on obstacles to problem-solvingproblem-solving FixationFixation was one obstacle was one obstacle
Fixation can limit creativity in designFixation can limit creativity in design Example: Sony temporarily abandoned Example: Sony temporarily abandoned
work on CD because at the size of a record work on CD because at the size of a record it would produce 18 hours of music. it would produce 18 hours of music. Realized CDs could be smaller and then Realized CDs could be smaller and then resumed research.resumed research.
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Jansson and Smith Jansson and Smith (1991)(1991)
Design students Design students Generate as many designs as possible in 45 Generate as many designs as possible in 45
minutesminutes Problem: Design an inexpensive, spill-Problem: Design an inexpensive, spill-
proof coffee cupproof coffee cup Do NOT include a mouthpiece or strawDo NOT include a mouthpiece or straw
Two groupsTwo groups Fixation group: got a picture of what NOT to Fixation group: got a picture of what NOT to
dodo Control group: no pictureControl group: no picture
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Jansson and Smith Jansson and Smith (1991)(1991)
Results: Those who saw pictures of Results: Those who saw pictures of the design with the mouthpiece and the design with the mouthpiece and straw produced more designs with a straw produced more designs with a mouthpiece and straw mouthpiece and straw These were forbidden designsThese were forbidden designs Evidence of Evidence of design fixation design fixation
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Factors Affecting Factors Affecting CreativityCreativity
What’s the point of Jansson and Smith What’s the point of Jansson and Smith (1991)?(1991)? Creative problem-solving affected by Creative problem-solving affected by
fixationfixation Similar to regular problem-solvingSimilar to regular problem-solving
Creative problem-solving is also similar Creative problem-solving is also similar to regular problem-solving because to regular problem-solving because analogy can be usedanalogy can be used George de Mestral – burrs / velcro (1955)George de Mestral – burrs / velcro (1955) Insight + 7 years of trial and errorInsight + 7 years of trial and error
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Creative CognitionCreative Cognition Ronald Finke developed a technique for Ronald Finke developed a technique for
training people to think creatively (training people to think creatively (creative creative cognitioncognition)) Let’s try it!Let’s try it! You’ll need something to write with (and on)You’ll need something to write with (and on)
I’ve randomly selected three shapes – take I’ve randomly selected three shapes – take 1 minute to construct an object using the 1 minute to construct an object using the shapesshapes Don’t make it a familiar objectDon’t make it a familiar object Don’t worry about what it is used forDon’t worry about what it is used for You can vary size, position, orientation, material You can vary size, position, orientation, material Wires or tubes can be bentWires or tubes can be bent
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Creative CognitionCreative Cognition
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Creative CognitionCreative Cognition The next step is to interpret how these The next step is to interpret how these
objects could be usedobjects could be used I’ll give you a category and you’ll have 1 I’ll give you a category and you’ll have 1
minute to interpret your object as an item minute to interpret your object as an item in that categoryin that category
Decide what your object could be used for Decide what your object could be used for Decide how it would workDecide how it would work
CATEGORY: Tools and UtensilsCATEGORY: Tools and Utensils
You’ve just created a You’ve just created a preinventive preinventive formform
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Creative CognitionCreative Cognition
People generated 360 preinventive People generated 360 preinventive formsforms 120 rated as being “practical”120 rated as being “practical” 65 rated as being “creative” AND 65 rated as being “creative” AND
“practical”“practical”
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Creative CognitionCreative Cognition
The points of Finke, 1995The points of Finke, 1995 People generated creative solutions People generated creative solutions
even thougheven though They were not told to be creativeThey were not told to be creative They were not screened for creativityThey were not screened for creativity They were not trained in how to be creativeThey were not trained in how to be creative
Creative problem-solving similar to Creative problem-solving similar to regular problem-solvingregular problem-solving People were more likely to find creative People were more likely to find creative
uses for forms they generated uses for forms they generated Technique lessened fixation issuesTechnique lessened fixation issues
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THE ENDTHE END
Don’t forget to read Don’t forget to read “Something to Consider”“Something to Consider”