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The Effect of Interhemispheric Communication on Memory: Less Than Meets the Eye

Investigating the impact of interhemispheric communication on memory retrieval using various tests and stimuli. Results analyzed and discussed in relation to existing research.

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The Effect of Interhemispheric Communication on Memory: Less Than Meets the Eye

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  1. The Effect of Interhemispheric Communication on Memory:Less Than Meets the Eye Team 4 Project

  2. Why Memory?

  3. Types of Memory • Semantic & Episodic • Semantic — general knowledge • Episodic — memory for particular event in time

  4. bed rest awake tired dream wake snooze blanket doze slumber snore nap peace yawn drowsy

  5. DRM Paradigm • Semantic with episodic can lead to false memories • Participants study list of words • Falsely remember associated words • Sleep example

  6. Semantic Memory • General knowledge questions • “Who invented the telegraph?” • Trick questions (semantic illusions) • Word in question is replaced with similar term • Moses Illusion

  7. Christman’s Research • 2003 • Tested episodic memory retrieval • Horizontal saccadic eye movement • 2004 • Eye movement lowers false memories (DRM)

  8. Interhemispheric Interaction • Encoding — left hemisphere • Retrieval — right hemisphere • Signals through corpus callosum • May increase retrieval http://www.its.caltech.edu/~jbogen/images/openbra2.gif

  9. Expanding on Christman • Test other possible interhemispheric aspects • Motor and auditory • Test both semantic and episodic memory

  10. Methods

  11. Participants • NJGSS scholars • 71 Students • 39 male • 32 female • Aged 16 to 18 years

  12. Design • Each subject was randomly assigned a condition • Control • Eye movement • Bimanual • Binaural

  13. What Was Tested • Episodic memory • False memory • Semantic memory • Semantic illusions

  14. Procedure • Episodic study (34 words) • Edinburgh Handedness Inventory (EHI) • Experimental treatment (30 sec.) • Semantic test (46 trivia questions, 4 illusory questions)

  15. Procedure (cont’d) • Experimental treatment (30 sec.) • Episodic recognition test (60 words) • DRM/false memory study (60 words) • Filler task (Linda problem) • Experimental treatment (30 sec.) • DRM recognition test (46 words)

  16. Results

  17. Results: Episodic Test • Hit rate: percentage of studied words correctly recognized • False alarm rate: percentage of unstudied words incorrectly recognized • Average hit rate = 74% • Average false alarm rate= 25%

  18. Results: Episodic Test Figure 1.

  19. Results: DRM Test • False memory rate: percentage of critical missing words incorrectly recognized • Average hit rate = 79% • Average false alarm rate = 16% • False memory rate = 86%

  20. Results: DRM Test Figure 2.

  21. Results: Semantic Test • Percentage correct and incorrect found for 46 general knowledge questions • Percentage tricked found for 4 illusory questions • Average % correct = 48% • Average % incorrect = 15% • Average % tricked = 45%

  22. Results: Semantic Test Figure 3.

  23. Discussion

  24. General Findings • Christman’s findings not verified • Precise data despite small sample size

  25. Episodic • Test similar to Christman et al. • No increase in hit rate • No decrease in false alarms

  26. DRM • Results similar to episodic study • All groups comparable • No difference in critical lures

  27. Semantic • Control group outscored others • Cabeza and Nyberg (2000) • Semantic memory — left hemisphere • Interhemispheric interaction may limit semantic retrieval

  28. Conditions • Three conditions • Each aimed at stimulating interhemispheric interaction • Not definite that these conditions stimulated lasting interhemispheric interaction • Definitely did not increase memory retrieval

  29. Conclusions • Qualifiers • Subjects were talented students from NJ • distraction from headphones • The brain is a highly complex system

  30. Questions?

  31. We would like to thank:Dr. Patrick (the star) DolanDr. David MiyamotoDr. Steve SuraceDr. Paul Victor Quinn Sr.

  32. Q: “In the biblical story, what was Joshua swallowed by?” A: “Manvir Singh” Q: “Who was Batman’s butler?” A: “Jeeves” Q: “What tree did Lincoln chop down?” A: “Lincoln chopped down most trees native to Kentucky.” Q: “What is the proper name of a badminton bird?” A: “Birdey”

  33. Q: “What is the name of the 3-leaf clover that is the emblem of Ireland?” A: “Lucky charms” Q: “What is the name of the ship on which Charles Darwin made his scientific voyage?” A: “Santa Maria” Q: “What is the proper name of the North Star?” A: “North Star” Q: “What Italian city was destroyed when Mt. Vesuvius was erupted in 79 AD?” A: “Bombay”

  34. Linda is 31 years old, single, outspoken and very bright. At university she studied philosophy. As a student she was deeply concerned with issues of discrimination and social justice and also participated in anti-war demonstrations. Now rank each of the following three statements from most to least likely. For the most likely statement, enter 1, for the more likely of the remaining two statements enter 2 and for the least likely statement enter 3. ___ Linda is a bank teller ___ Linda is active in the feminist movement ___ Linda is active in the feminist movement and is a bank teller

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