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Hemispheric Specialization: Semantic Organization and Affective Style

Hemispheric Specialization: Semantic Organization and Affective Style. Line Perception Task. Instructions

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Hemispheric Specialization: Semantic Organization and Affective Style

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  1. Hemispheric Specialization: Semantic Organization and Affective Style

  2. Line Perception Task Instructions • On each of the following 10 screens you will see a line that is bisected near the middle. For each line, please indicate with an R (Right side) or an L (Left side) which half of the line appears larger to you.

  3. Line 1

  4. Line 2

  5. Line 3

  6. Line 4

  7. Line 5

  8. Line 6

  9. Line 7

  10. Line 8

  11. Line 9

  12. Line 10

  13. Word Generation Task Instructions On each of the following screens you will see three words presented. For each set of words you are to come up with a word that is related to all three. For example, if the three words were: cottage/swiss/cake a correct answer would be “cheese” You will have 10 seconds for each set of words.

  14. cream skate water

  15. show life row

  16. loser throat spot

  17. duck fold dollar

  18. rocking wheel high

  19. preserve ranger topical

  20. aid rubber wagon

  21. cracker fly fighter

  22. cane daddy plum

  23. fish mine rush

  24. Scoring – Word Generation Task • Ice • Boat • Sore • Bill • Chair • Forest • Band • Fire • Sugar • gold

  25. Scoring – Line Bisection Task • Sum number of Ls (left side chosen) for the following trials: • 2, 4, 5, 7, 9 • Larger the score the greater the chronic right hemisphere (RH) activation

  26. Brain Asymmetry – Functional Lateralization • The two hemispheres are specialized for different activities • Left Hemisphere (LH) – language (e.g., word recognition) • Right Hemisphere (RH) – emotion recognition Demonstrated with split screen techniques On following screens, focus on +

  27. +

  28. REMIND

  29. +

  30. Split Screen Methodology • Left Visual Field is illustrated in RED • Right Visual Field is illustrated in BLUE • Right Hemisphere receives visual info from LVFonly • Left Hemisphere receives visual info from RVFonly

  31. Behavioral Study Findings • Faster verification of words presented to RVF/LH than LVF/RH • Faster verification of emotions presented to LVF/RH than RVF/LH

  32. Brain Asymmetry and Semantic Organization Focused semantic organization Less interconnected than RH • Smaller proportion of white matter (neural connections) Diffuse semantic organization More interconnected than LH • Greater proportion of white matter (neural connections) LEFT HEMISPHERE RIGHT HEMISPHERE

  33. Hemispheric Differences in Priming

  34. SOFA

  35. CHAIR

  36. LAMP

  37. CHAIR

  38. Semantic Priming in the RH and LH • Priming = Facilitation of recognition following related stimuli • Closely related associates primed in LH (faster recognizing CHAIR following SOFA) • Distant associates primed only in RH (faster recognizing CHAIR following LAMP only for LVS presentation)

  39. Individual Differences in Brain Asymmetry • Research indicates that the tendency to exhibit asymmetry (favoring left over right, or right over left activation) is a stable individual characteristic • Can be assessed with line bisection task • More left side choices indicates greater RH activation • Also assessed with EEG

  40. EEG(Electroencephelagram) • How it works: Electrodes placed on the scalp record voltage differences between different parts of the brain

  41. Individual Differences • People with greater RH activation should perform better on a remote associates task (a measure of creativity) • RH Active (> 60% left) LH Active (< 60% left) Associate Task Performance 6.74 5.73

  42. Brain Asymmetry and Affective Style

  43. Brain Asymmetry and Affective Style • Hemispheres differentially specialized for different emotions • Assess brain waves with EEG when person is put in unpleasant or pleasant mood • Left frontal hemisphere is more active than the right when a person is experiencing pleasant emotions; right is more active than left with unpleasant emotions

  44. Brain Asymmetry and Affective Style • Research indicates that the tendency to exhibit asymmetry (favoring left over right, or right over left activation) is a stable individual characteristic • Dispositionally positive persons show greater left frontal EEG activity; dispositionally negative persons show greater right frontal EEG activity

  45. Questions?

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