PSY270 JUNE 19.docx

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Christine Burton

PSY270 JUNE 19, 2012 PROBLEM SOLVING BROAD IN GENERAL THEN MORE SPECIFIC TWO TYPES OF PROBLEMS, DUFFERNT STRAGETIES AND SPECIFIC FACOTRS THAT INFLUENCE AND OR HINDER IT Need everthing to solve so cannot really be modular, Role of past knowledge, more knowledge have better able to solve problem Problem solving - Path to goal isn’t obcius, solution isn’t obvious - Not necessarily hard, it ranges, could be what eat for breakfast no hard but solution not obvious unless only have bread in house - Range in diffcutly - Exists within a problem space (computer science) - Newell and simon deceloped first computer to solve problems better then humans, - N and s talked about these to describe a computer which is excellent to how humans define problems and solve them - It is the way not a way - Problem space contains 3 features - The initial starting off - The goal end place - Between any number of intermediate could be number of things you could do Contd - Envision problem space as a maze, know what to end up but not obvious how to get there - Need to know where to end up problem is not what is goal but how to get there - What are best intermediate states to get there - Best way not random go in any direction - Pronlems have different surface features the problem is different The problem cycle - Go through a series of steps that can solve all problems make up cycle - 1. Problem identification – solve first have to recognize have problem, not just reco have problem but what it is. Couple not getting along problem bobby abd sussy, she is distant identify there is a problem if she is getting distant bec he getting to intense says I think suzzy is feelin neglected, if identify wrong problem get wrong solution – coreectly identifying what problem is - 2. Define problem and how to represent it, from abstract idea to put it onto page r solidy in mind. Some easy put into sentice, better ways depending on problem. Mary is 10 best way is to use symbols to represtn solution , use diagrams symbols - 3. Stragety formulation, for monk graph then answer, first solve for mary then sovle susan, stragety to solve problem - 4. May need to organie information, may need to gather more information look something up on interent - 5.Resource allocation – allocate resources most efficiently, before resources as cognitive resources, but with problem solving the real world, cognitive resources allocate but other resources like monetary, others - 6. Monitoring, not spend so much time on a certain solution - 7. Evalutaiotn – did it work or did not - Not go through in this order, this may be the most sufficient way, this is not an automatic uncncious process we decide what to do, can skip monitoring and may get to solution, they are not required nor in that order Ways to rep - Symbols - And diagrams - Using diagrams with buddist, not when but id there is a time, easy way tio solve when draw as graph, Bus driver problem ,. Ask name of bus driver, Contd - Well defined – problems have predetermine solution, procedure, once goal on path , math prpobelm go through rules one initial one goal and one path - Ill defined – not a clear path, many paths, how to open a can with a can withough a can opener, ill defined no initial and goal but how to get there is not defined - Solution is path Well defined - One correct answer and predetermined path - Depending on problem differtn path to take - One way to apply algoritm - which is series of rules u apply repreasdelty apply enough able to come up with answer - Well defined – not neccesarly one path but path everyone agrees that garuntees solution, may be two or three - Ill defined could be many, such as deciding the major no one agrees best way to get - Algerbra apply role get answer - Albl – anagram for ball, use algoritm all possible combinations, may take a while to aplly the rule over and over again, this example not many word - Number of iterations less practile Contd - Use a heurtic, rule of thumb, relying pf past knowldeg and experience, what has used in past , this word may take three letter grouping take knowldeg of English, use heuristic can come up woth word - However heuristic may lead you astry like the word gnome, use heuritsc of words that go together at begingin of word like gn for gnome - Heuristic is rule or stragety Problem solving heuristic - These are ones newell and simon plugged in - Not good to have algrothims all the time not the computing power - Turns out how humans use to solve problems - First used in computers we do them naturally - Working forward is one, going on step at a time taking immediate step forward - No car need money no money work - Problem with heurisitic may not be efficient stragety , for other aspects of life like dropping out of school - Working backwards, start goal and what need to get there, clinical osych phd, grad school, gre, study Contd - Generate and test, think off all and try them out - Like list of things I eat with letter c at beginning, - Can be useful if number of options generated is llimited or way to test is easy - Job is poor, generate large number but test all of them - Means ends analysis – take big problem of problem space and breaks into sub goals sub problems, each sub problem little amount of space - Not algrothim bc not one rule but stragety, By analogy - Not just well deifined ones but others well best - Analagoy – use previous knowledge how we solve in past and apply to new problem only work if similar - Isomorp, basically the same problems same strcutuer different surface features - Train a is express train – we use same as like in the Buddha same structure but wording is different - Same solutioin for one and apply to another, one problem is that problems are isomorphic, - Problems from text book, 223 - Tumor problem - Also another proble, fortress in country small bodies of men same as the other problem - These are isomorphic - First one solved as second, divide strong foces and approach different angles, Experiment - Duncker radiation problem - Radiation is main, convergence problem is isomprhic to first - Given radiation 10 perent able to solve it - Given radiation only 30 able to with convergence - With convergence problem and self generated solution 41 percent solved the radiation problem - The only thing get it over half is rad and convergence then solution then told the hint use solution to help solve army problem then 75 percent - Problem solving by analogy is effective if figure out they are same problem which is a hard task Contd - Kurtz and low - Know isomor is encoding the problem - Group 1. Reads convergence problem and solve rad problem – 15 percent solved rad problem - 2. Read two convergence problems while reading explicity told look for similarities between the two problems as solving both not seen rad problem yet, look sim between two convergence problems. Then given a third the rad much better same as 41 percent with other experiment - 3. One convergernce problem and radiation at same time, 2 problems in grup 3 3 problems. Also told look for similiarites between the two structurally, was worse then group 2 - Both 2 and 3 looked for structure similairites - 2 wasn’t event told was similar - Bc what doing before rad problem, figuring out structure, encodint structure of problems vreating a schema, a organizing pattern hook info onto - 2 was creating that structure, - 3 was using rad to create schema not already have exisiting schema Ill defined 3 problems to solve How did you solve gave answers, they just sort of came together Ill defined - Acquire insight they just come to you, no particular path - A a ha idea - Require divergent thinking, outside of the box come up with many ideas - Well divined is convergent – one solituion - Deivergent thinking related to creativity Divergent thinkin gvreativty and testing - Hard to study cant say be creative - Tests of divergent thinking are used to distinguish clever creative people, not say be creative in
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