Mechanisms of Memory: Can we distinguish true from false memories?
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1 Mechanisms of Memory: Can we distinguish true from false memories? Lila Davachi D. Cohen (1996) Dept of Psychology & Center for Neural Science New York University AAAS Judicial Seminar on Neuroscience
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3 False Memories: What are they? 1. Remember things that never happened 2. Recall what happened but misattribute it to wrong time or place 3. Think you imagined something that really is a true memory
4 Memory Error or Memory Distortion? The McMartin Preschool Case Manhattan Beach, CA
5 Recovered Memories or False Memories? Memories of past abuse or other traumatic event Forgotten and recovered many years later Legal implications: Jail based solely on testimony of remembered abuse
6 Memory and the Brain 1. How are memories formed and retrieved? 2. Can brain imaging provide markers of a. what a person is learning? b. whether a person is remembering? c. what they are remembering? 3. Can we distinguish true from false memories in the brain?
7 Memory and the Brain 1. How are memories formed and retrieved? 2. Can brain imaging provide markers of a. what a person is learning? b. whether a person is remembering? c. what they are remembering? 3. Can we distinguish true from false memories in the brain?
8 Patient H.M. H.M. and the Amnesic Syndrome 1926 born 1942 first major seizure (age 16) 1953 bilateral medial-temporal lobe resection (hippocampus & nearby structures) 1955 first published report of pervasive and profound anterograde amnesia 1962 neuropsychological examinations characterizing the amnesic syndrome
9 Medial Temporal Lobes and Amnesia Right now, I m wondering. Have I done or said anything amiss? You see, at this moment everything looks clear to me, but what happened just before? That s what worries me. It s like waking from a dream; I just don t remember. H.M
10 Medial Temporal Lobe: Top of Information-Flow Hierarchy
11 MTL & Relational Memory Formation event or episode
12 MTL & Relational Memory Formation event or episode hippocampus
13 MTL & Recollection partial cue pattern completion hippocampus
14 MTL & Recollection partial cue pattern completion hippocampus
15 Memory and the Brain 1. How are memories formed and retrieved? 2. Can brain imaging provide markers of a. what a person is learning? b. whether a person is remembering? c. what they are remembering? 3. Can we distinguish true from false memories in the brain?
16 Predicting the Mnemonic Fate of an Experience Approach: Use fmri to identify brain events during an experience that predict whether the experience will be later remembered or forgotten. D. Cohen (1996)
17 Subsequent Memory Paradigm Encoding Activation GIRAFFE MUSTARD BASSOON
18 Subsequent Memory Paradigm Encoding Activation Subsequent Behavior Remembered? Forgotten? GIRAFFE MUSTARD BASSOON GIRAFFE MUSTARD BASSOON
19 Subsequent Memory Paradigm Encoding Activation Subsequent Behavior Remembered? Forgotten? GIRAFFE MUSTARD BASSOON GIRAFFE MUSTARD BASSOON 4 Activation Peri-Stimulus Time (sec)
20 Consider the Source: Multiple Forms of Episodic Memory Consider the Source Memory is Treachery
21 [Davachi et al. (2003) PNAS] Encoding Items and Encoding the Source
22 Memory and the Brain 1. How are memories formed and retrieved? 2. Can brain imaging provide markers of a. what a person is learning? b. whether a person is remembering? c. what they are remembering? 3. Can we distinguish true from false memories in the brain?
23 Can we see evidence THAT someone is remembering? Eldridge et al., Nature Neuroscience (2000)
24 Memory and the Brain 1. How are memories formed and retrieved? 2. Can brain imaging provide markers of a. what a person is learning? b. whether a person is remembering? c. what they are remembering? 3. Can we distinguish true from false memories in the brain?
25 Can we see evidence of WHAT someone is remembering? Perceive Retrieve (Wheeler et al., PNAS, 2000)
26 Episodic Remembering: Recapitulation of Encoding Activation Words > PICTURES Perceive Retrieve Words > SOUNDS Perceive Retrieve (Wheeler et al., PNAS, 2000)
27 Memory and the Brain 1. How are memories formed and retrieved? 2. Can brain imaging provide markers of a. what a person is learning? b. whether a person is remembering? c. what they are remembering? 3. Can we distinguish true from false memories in the brain?
28 Distinguishing true from false memories Sensory reactivation regions The neural signature of experienced scenes or people will be more likely to engage primary sensory areas since these memories should include more perceptual detail. Memory representation regions Will more central memory regions (such as the hippocampus) differentiate between true and false memories? General cognitive processing regions False memories will require more monitoring during retrieval because the same memory evidence is not there (likewise, reaction times will be longer..)
29 Can Imagination be Mistaken for Reality? Study Phase Word-only [imagine picture] Word+Picture Test Phase Did you see a picture of this item? Gonsalves and Paller (2000), Nature Neuroscience
30 Imagination Inflation: Remembering Seeing What You Imagined 1 Probability of Yes-Picture Response * 0 Word+Picture Word Only New
31 (Gonsalves and Paller, 2000) (Okado and Stark, 2003)
32 Understanding Imagination Inflation Rich vivid imagery creates a memory that resembles the contents of a memory for real experiences During retrieval, the reactivation of these rich imagery details is falsely attributed to having seen the stimulus rather than to having imagined it A form of source memory confusion Did I think it or did I see it? The closer our imagination gets to perception, the higher the likelihood of confusion
33 (Kahn et al., J Neurosci, 2004) Understanding False Memories: False Recapitulation
34 Sometimes False Memories are Due to False Recapitulation
35 Misattribution Oklahoma City bombing, 1995 John Doe #2: Product of a memory error
36 People Can Come to Believe Memories for Events that Never Occurred Edward Daily and the Massacre at No Gun Ri Ex-GI Says He Wasn't At No Gun Ri 19:59EDT By CHARLES J HANLEY AP Special Correspondent 05/25/00 CLARKSVILLE, Tenn. (AP) -- One of the Korean War veterans who described the U.S. Army killing of refugees at No Gun Ri says he now recognizes he could not have been at the scene and instead learned of it second-hand from soldiers who were there. Wartime documents found in government archives by The Associated Press show that the ex-soldier, Edward L. Daily, 69, of Clarksville, was in another unit elsewhere in Korea when 7th Cavalry Regiment companies fired on the South Korean civilians in late July "I have to agree with your records. I can't dispute them,'' Daily said in an AP interview after reviewing the relevant documents. Asked whether he agreed the records showed he could not have been at No Gun Ri, he replied simply, "Yes.''
37 Implanting False Memories in the Lab Loftus & Pickrell (1995) Subjects presented with 3 true stories and 1 false story from this person s past (between ages 4-6) False story (e.g., getting lost in the shopping mall) had realistic details from relatives Subjects recalled 68% of true events and 29% of false events the false events were recalled even two weeks later Some subjects clung to the false memory even after being debriefed
38 Can the Brain Distinguish True from False Memories? Study: male & female speakers read 6 related word lists Test old/new recognition of visually presented words TRUE items words from the studied lists FALSE items nonstudied words related to studied words NEW items unrelated new words Proportion of Old responses True = False > New (Cabeza et al., 2001 PNAS) 0.00 True False New
39 Can the Brain Distinguish True from Imagined (False) Memories? Hippocampus supports memory for the semantic gist of an experience Can we look at brain activity and know whether a person is accurately remembering? NOT HIPPOCAMPUS Parahippocampus supports memory for the perceptual details of an experience What about regions sensitive to perceptual information? FUSIFORM GYRUS and PARAHIPPOCAMPUS
40 Summary Research design and analysis has greatly improved over the past few years, allowing us to reveal some consistencies: true memories tend to activate primary sensory regions more than false memories. many memory related regions show equivalent activation for true and false memories frontal regions tend to show greater activation for false as compared to true memories Basically, true and false memories look more ALIKE than they look different No data available on individual analysis - how reliable are the small differences? Data analyzing the effects of emotion on true and false recognition are equivocal (some show higher FM rate, some lower)
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