memory_2_08 - Memory II October 2, 2008 Types of Memory...

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Unformatted text preview: Memory II October 2, 2008 Types of Memory Types of Memory The Case of Henry M (H.M.) Hippocampus Mammillary Bodies Anterior Thalamus Cingulate Gyrus Fornix Mamillothalamic Tract Amygdala Dorsomedial Thalamus Orbitofrontal Uncus Two Limbic Circuits Medial (Papez) Lateral Amygdalofuga l pathways The Human Amnesic Syndrome Impaired new learning ( anterograde amnesia ), exacerbated by increasing retention delay Impaired recollection of events learned prior to onset of amnesia ( retrograde amnesia, remote memory impairment ), often in temporally graded fashion Not limited to one sensory modality or type of material Normal IQ, attention span, nondeclarative forms of memory Recent/Remote Distinction Three patterns of RA Temporally-graded Temporally-limited Decade-nonspecific Typically see both AA and RA in amnesia (no RA without AA) but there are exceptions Selective (focal) retrograde amnesia Temporally-Graded RA Temporally-Limited RA Decade-Nonspecific RA Remote Recent Remote Recent Recent Remote Patterns of Retrograde Amnesia Normals Normals Amnesics Amnesics Frontal/Executive Contributions to Memory Temporal ordering (time tagging) of memories Contextual aspects of memory Source memory (memory for where information was learned) Metamemory (feeling of knowing) Intentional aspects of memory/prospective memory (remembering to remember) Theoretical Accounts of Amnesia 1. Encoding deficit Amnesics have difficulty organizing and learning TBR information for later recall Evidence from LOP studies Can explain: AA (impairment in new learning, or recent memory) Has difficulty explaining: shrinking RA trauma RA at 2 weeks RA at 6 months Theoretical Accounts (cont.) 2. Consolidation deficit post-encoding deficit: difficulty in the consolidation of TBR information Huppert & Percy (1979): accelerated rates of forgetting Can explain: rapid forgetting in amnesia Cant explain: extensive RA Theoretical Accounts (cont.) 3. Retrieval deficit Studies showing amnesics are abnormally susceptible to interference Retrieval is often aided by cuing Inconsistent performance across testing situations Indirect versus direct tests of memory Helpful in explaining some retrograde deficits Spared Abilities in Amnesic Disorders 1. Attention span (e.g. digit span) 2. Measured intelligence 3. indirect forms of memory (nondeclarative) Skills; skill learning (rotary pursuit, mirror tracing or reading) Priming (perceptual and conceptual) Conditioning familiarity (Nondeclarative) Perceptual Priming Perceptual Priming Word-Stem Completion...
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This note was uploaded on 12/01/2011 for the course CLP 7934 taught by Professor Staff during the Fall '08 term at University of Florida.

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memory_2_08 - Memory II October 2, 2008 Types of Memory...

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