1. Reminder your exam is open! You have until Thursday night to take it!

2. Next Tuesday Read article by Anne Treisman

3. Moving from Perception to Cognition You will now find chapters in the Cognition textbook on reserve to be helpful

4. Attention

5. What is “attention” attention is poorly defined - different people mean different things by “attention”

6. What is “attention” attention is poorly defined - different people mean different things by “attention” –An aroused state: a state conducive to rapid perception and cognition. As in “pay attention!”

7. What is “attention” attention is poorly defined - different people mean different things by “attention” –An aroused state: a state conducive to rapid perception and cognition. As in “pay attention!” –Vigilance: maintaining a state of engagement - “paying attention in class”

8. What is “attention” attention is poorly defined - different people mean different things by “attention” –An aroused state: a state conducive to rapid perception and cognition. As in “pay attention!” –Vigilance: maintaining a state of engagement - “paying attention in class” –Selective Attention: focusing on one object or location to optimally deal with the sensory information coming from it

9. What is “attention” “Everyone knows what attention is. It is the taking possession by the mind in clear and vivid form, of one out of what seem several simultaneously possible objects or trains of thought...It implies withdrawal from some things in order to deal effectively with others…” - William James

10. What is “attention” James’ definition emphasizes two important aspects of attention:

11. What is “attention” James’ definition emphasizes two important aspects of attention: That attention implies a suppression of information at unattended locations 1. That attention implies a suppression of information at unattended locations

12. What is “attention” James’ definition emphasizes two important aspects of attention: That attention implies a suppression of information at unattended locations 1. That attention implies a suppression of information at unattended locations 2. That attention is a selection of some information for enhanced perception or mental operations

13. What is “attention” Enhanced perception or mental operations? –Further identification –Planning appropriate response –Encoding (storing) into memory –Entry into awareness

14. Learning About Attention by Pushing the Limits Ulrich Neisser –Tracking one moving object out of many

15. Learning About Attention by Pushing the Limits Ulrich Neisser –Tracking one moving object out of many –About 50% miss the gorilla

16. Learning About Attention by Pushing the Limits Ulrich Neisser –Tracking one moving object out of many –About 50% miss the gorilla –Demonstration that unattended information is dramatically absent from consciousness/memory

17. Selective Attention A tale of bottlenecks and basketballs

18. Two Distinct Processes There are two processes that get bundled into our idea of attention: –orienting - shifting attention (usually in space, but also to non-spatial features such as pitch) –selection - what attention does to perception These are often confused and used interchangeably We’ll switch back and forth between the two, but we’ll try to keep them separate First: the consequences of selection

19. Information Theory: ~1950’s: Psychologists began to think of the human perceptual mechanisms as “information processors”

20. Information Theory: ~1950’s: Psychologists began to think of the human perceptual mechanisms as “information processors” Began asking questions such as “how much information can the human mind handle at once?”

21. Information Theory Donald Broadbent - earliest systematic investigations of selective attention

22. Information Theory Donald Broadbent - earliest systematic investigations of selective attention x x xx oo o o o

23. Information Theory Donald Broadbent - earliest systematic investigations of selective attention

24. Information Theory Donald Broadbent - earliest systematic investigations of selective attention –when simultaneous questions were asked, subject performed poorly on all questions

25. Information Theory Donald Broadbent - earliest systematic investigations of selective attention First principle of human information processing: capacity is limited

26. Information Theory Donald Broadbent - earliest systematic investigations of selective attention

27. Information Theory Donald Broadbent - earliest systematic investigations of selective attention –when simultaneous questions were asked from physically separate speakers, and subject instructed in advance which question to answer, performance was nearly perfect

28. Information Theory Donald Broadbent - earliest systematic investigations of selective attention Second principle of human information processing: information sources can be selected