1. PSY 190: GENERAL PSYCHOLOGY CHAPTER 8: COGNITION

2. How important is attention? 1987 Northwest Airlines jet from Detroit crashed moments after take-off  154 passengers and crew, 2 on ground, died

3. Attention Close or careful observation or mental concentration A selective narrowing or focusing of consciousness

4. Different Aspects of Attention Selective Attention  Visual  Auditory

5. Selective Attention Focusing our awareness on only part of everything we are experiencing  Trying to attend to one task over another

6. Selective Attention: Visual The Stroop Test (1935)  Names of words cause a competing response  Flanker compatibility task  Task–irrelevant stimuli are extremely powerful

9. Dalrymple-Alford & Budayr (1966): First to encourage presentation & timing of stimuli individually. This method now dominates. BLUEGREEN Stroop effect

10. BLUE GREEN interference facilitation

11. Selective Attention Neisser et al. (1979)  In this one minute video, there will be two basketball teams  You task is to count the passes of just one team Click on picture for video 

12. Selective Attention Simons & Chabris (1999) Click on picture for video 

13. Attention & Visual Perception Mack & Rock (2000) Research on a phenomenon known as inattentional blindness suggests that unless we pay close attention, we can miss even the most conspicuous events

14. Sights unseen?  Inattentional Blindness  Participants were asked to focus on a cross  They often failed to notice an unexpected object, even when it had appeared in the center of their field of vision  Mack & Rock (2000)

15. Change Blindness People fail to detect substantial features of photographs and real world experiences They seem to lack a precise visual representation of their world from one view to the next Daniel Simons Levin & Simons study (1997)  Levin & Simons study (1998)  Click on pictures below for videos

16. Choice Blindness Johansson, Hall, Sikstrom, & Olsson (2005) Participants failure to detect a mismatch from their original choice to what was later presented to them as their original choice (but was not) Petter Johansson  Click on pictures above for videos

17. Selective Attention (Auditory) Dichotic listening task (Cherry, 1953)  Any task where two streams of auditory information are presented simultaneously, one to each ear (generally over headphones). Subjects are required to attend to one ear only.  Shadowing task -- Two messages played, one to each ear. One message has to be "shadowed" by the subject (repeated back out loud). This is called the “attended” message.

18. In Shadowing Task… Listeners seldom noticed the unattended message being in a foreign language or in reversed speech  However, they nearly always noticed physical changes in the unattended message Cherry’s conclusion?  People can shadow accurately but its not easy  Unattended auditory information receives very little processing

19. Categorization  Process by which things are placed into groups Concept  Mental groupings of similar objects, events, ideas, and people Knowing about something is in a category gives us a great deal of information about it.

20. Knowledge Can Affect Categorization Knowledge of the world informs and shapes our predictions about concepts Features in a complex network of explanatory links indicate  Relative importance of features  Relations among features Objects classified into concept that best explains the pattern of attributes

21. Do we categorize males as being more angry? Becker et al. (2007)  Used gender-neutral faces in attempts to determine this  Categorization Heuristics

24. Categorization can lead to errors in stereotyping…

25. Here’s another error…

26. Problem Solving Mental processes that occur when people work toward determining the solution to a problem Kahneman (2011)  Two systems appear to be involved  System 1 – used for automatic processing  System 2 – used for effortful processing

27. Availability Heuristics We use our memory of actual instances for our judgment. So, when we make a judgment, things that are available in our mind determine our judgment. Example  Think of words that begin with r.  Think of words that have r in the third position?  Which is easier to think of?

28. The availability heuristic: We base our judgments of the frequency of events on what comes to mind There are three times as many words with r in the third position (car, park, barren, march) 28 What’s going on?

29.  Which cause of death is more likely?  Homicide orAppendicitis  Auto-train collision orDrowning  Measles orSmallpox  Botulism orAsthma  Asthma orTornado  Appendicitis orPregnancy 29 Lichtenstein et al. (1978)

30. Actual correlations: It’s cloudy and there’s a smell in the air, so it will probably rain Illusory correlations: We think things are correlated, but they are not  One group and their stereotype 30 Availability: Illusory Correlations

31. Making judgments based on outward appearances only even though the base rate is low One person represents the larger group  Extrapolate behavior of one person to everyone else 31 The Representativeness Heuristic

32. Tversky & Kahneman (1974)  These researchers presented this example:  We randomly pick one male from the population of the US. He wears glasses, speaks quietly, and reads a lot. Is it more likely that this male is a librarian or a construction worker? 32 Amos Tversky Daniel Kahneman

33. Linda is 31 years old, single, outspoken, and very bright. She majored in philosophy. As a student, she was deeply concerned with the issues of discrimination and social justice. Which of the following is more probable? Linda is a bank teller. Linda is a bank teller and is active in the feminist movement. 33 The feminist bank teller Tversky & Kahneman (1983)

34. A certain town has two hospitals. The large hospital has ~45 babies born a day, and the small hospital has ~15 births a day. About 50% of all babies are boys. However, the exact percentage varies by day. For a period of 1 year, each hospital recorded the days on which more than 60% of babies born were boys. Which hospital recorded more of these days? 34 The problem of small samples Tversky & Kahneman (1974)

35. We have a tendency to selectively look for information that conforms to our hypothesis and to overlook information that argues against it. 35 The Confirmation Bias

36. The way a question is worded can influence how people answer a question How choices are stated seems to matter  When a problem is framed in terms of gain, we tend to choose sure things (risk-aversion strategy).  When a problem is framed in terms of loss, we tend to choose risky things (risk-taking strategy) Framing Effect 36

37. Framing Effect Example:  If you are lucky, you have a chance to win $1000. Which game do you choose?  Game A. a sure gain of $240  Game B. 25% chance to gain $1000 and 75% chance to gain nothing  Game A  84%  Game B  1 6% 37

38. Framing Effect Example:  You are given $1000, provided that you will play either one of the following games. Which game do you choose?  Game C. a sure loss of $750  Game D. 75% chance to lose $1000 and 25% chance to lose nothing.  Game C.  13%  Game D.  87% 38

39. Framing Effect Sunk Cost Effect  The willingness to do something because of money or effort already spent  This is a special case of the framing effect

40. What Is Expert Cognition? What makes someone an expert at anything?

41. What Is Expert Cognition? Reber (1967)  Implicit learning  Learning that appears to occur without awareness or intention to learn and often cannot be described in words what has been learned  “Cognitive unconscious”

42. Implicit Learning: Learning that lacks perception? Reber (1980)  Too many variables involved – too much to remember  In explicit learning, we consciously select only the key variables  In implicit learning, we are unselective and pay attention to all variables  Few attentional resources are needed

43. Implicit Learning: Expert Knowledge? McGeorge & Burton (1990)  Implicit learning allows us to skip steps  Everything becomes automatic  We become experts

44. Implicit Learning: Expert Knowledge? Examples:  Chess players  Football QB’s  Riding a bike

45. Practice Makes (Nearly) Perfect Practice is crucial Motivation is crucial Expertise can sometimes overcome effects of age, but response time slower

46. Expert Pattern Recognition Chase & Simon (1973) Chess master vs. beginners Memorize chess pieces positioned for a real chess game for 5 seconds Reproduce the arrangement shortly after

47. Expert Pattern Recognition Procedure  Participants were given five seconds to memorize board  They were then asked to draw an empty chess board and reproduce the arrangement of pieces Chase & Simon (1973)

48. Actual GameRandom Game Chase & Simon (1973)

49. (a) The chess master is better at reproducing actual game positions (b) Master’s performance drops to level of beginner when pieces are arranged randomly Chase & Simon (1973)

50. Chunking Helps Chase & Simon (1973) Implication: Chess master did not have a superior STM (as some had suggested); rather he had stored many of the patterns that occur in real chess games in LTM He saw the layout of chess pieces not in terms of individual pieces but in terms of 4-6 chunks, each made up of a group of pieces that formed familiar, meaningful patterns The chess master’s advantage vanished when the board was arranged randomly – familiar patterns were destroyed

51. Credits Some slides prepared with the help of the following websites:  www.whizzesworld.net/Psychology/PPT/.../attention-and- cons... www.whizzesworld.net/Psychology/PPT/.../attention-and- cons  http://www.scribd.com/doc/83755755/8/Change-Detection http://www.scribd.com/doc/83755755/8/Change-Detection  www.atkinson.yorku.ca/~park/memory/lec2.ppt ‎  www.itu.dk/.../2011-Spring-HIP-Lecture09-... www.itu.dk/.../2011-Spring-HIP-Lecture09-  www.tamu.edu/faculty/takashi/.../Ch%209%20Knowledge.ppt www.tamu.edu/faculty/takashi/.../Ch%209%20Knowledge.ppt