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Query: UMLS:C0598853 (forgetting)
 3,232 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Six-, 8-, 10-, and 12-year-old children (10 boys and 10 girls) reconstructed two visual patterns from immediate memory, while other 5- and 6-year-old children (10 boys and 10 girls) reconstructed the identical patterns by direct copying. Patterns were simple and composed entirely of circles or squares as component items. Four results were emphasized: (a) Numerous errors mady by the copying groups led to the conclusion that memory loss is often overestimated in young children. Since an independent estimate of perceptual encoding errors is rarely carried out, encoding mistakes are often included among forgetting errors. (b) One pattern was both copied and remembered more poorly than the other in accord with a Piagetian interpretation of a conceptual conflict inherent in the pattern design between spatial and numerical correspondence of component pattern items. (c) A memory strategy emphasizing configuration preservation was suggested for the 6-year-olds who made slightly fewer memory than copying errors for two configural scoring categories. (d) Performance in an unrelated planning-for-memory task significantly differentiated between better and worse performers on the visual pattern memory task.
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PMID:Memorizing and copying visual patterns: a Piagetian interpretation. 46 4

Rehearsal, backward counting, and production of alpha brain-waves were used as interpolated tasks in a Brown-Peterson paradigm to determine their effect upon verbal retention. A within-subjects design was used in which trained subjects were told on a given trial either to produce alpha rhythm, mentally rehearse, or count backward following presentation of a CCC trigram. Results for the backward-counting condition duplicate, for the retention intervals used, the shape of the classic Peterson and Peterson forgetting curve but indicate little loss of memory in either the rehearsal or alpha conditions. No siginificant difference was found between the alpha production and rehearsal conditions.
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PMID:Alpha brain wave production as an interpolated task in a Brown-Peterson paradigm. 127 77

We examined the relationship between memory impairment and functional disability in multiple sclerosis. Tests of memory, sensorimotor ability, and functional capacity were administered to fifty-six subjects with chronic-progressive or remitting-relapsing MS. Sensorimotor impairment, functional disability, and chronicity predicted impairment on various measures of memory acquisition, while age and type of diagnosis did not. After accounting for the effects of initial acquisition, delayed-recall performance was weakly-associated with disability. We suggest that: (1) Functional disability is associated with memory loss in MS; (2) MS-forgetting is caused by defective acquisition, rather by a deficit in consolidation or storage; (3) Level of disease activity, rather than type of MS diagnosis, determines the degree of memory impairment; and (4) MS disability needs to be evaluated multidimensionally, to account for both neurologic and functional impairment.
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PMID:The relationship between disability and memory dysfunction in multiple sclerosis. 134 11

Differential responding to changes in the stimulus situation, long central to the concept of stimulus control, also provides the implicit conceptual basis for assessing the nature of a variety of associative relationships. However, there is substantial evidence that the perception of stimulus similarity is not a static property. Generalization gradients to contextual as well as discriminative stimuli flatten over time, and this increase in perceived similarity presumably reflects forgetting of the detailed characteristics or attributes of stimuli. Methodologically, the flattening of the gradient imposes an important constraint: The effect of a stimulus shift will be highly sensitive to the length of the delay interval between training and testing. Conceptually, the loss of memory for stimulus attributes also implies that the sources of interference in retention can increase over time.
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PMID:Forgetting of stimulus attributes: methodological implications for assessing associative phenomena. 143 37

The present research was concerned with anterograde and retrograde memory for a socially transmitted food preference in rats with lesions to the dorsal hippocampus or dorsomedial thalamus, and operated controls. In Expt. 1, food-preference training was administered postoperatively and memory was tested following various delays. Both lesioned groups acquired the preference normally, but rats with hippocampal lesions displayed a rapid rate of forgetting that indicated significant anterograde amnesia. In Expt. 2, the food preference was acquired at different times preoperatively and retrograde memory was tested postoperatively. Both lesioned groups exhibited loss of memory when training immediately preceded surgery, but only rats with hippocampal lesions displayed a temporally-graded retrograde amnesia. The results confirmed the differential effects of hippocampal and thalamic lesions on memory performance. It was suggested that memory loss following thalamic lesions was related to factors associated with original learning, whereas the pattern of hippocampal amnesia reflected disruption at a later stage in the learning process.
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PMID:Anterograde and retrograde amnesia in rats with dorsal hippocampal or dorsomedial thalamic lesions. 236 34

This paper reports a series of experiments that assessed learning and memory performance in aged rats from a neuropsychological perspective. Relative to young adults, old rats displayed rapid rates of forgetting, increased susceptibility to interference, and poor long-term recall of specific experiences. There were no age differences on tests of short-term memory. In general, the performance of aged rats paralleled that of young rats with restricted lesions to the hippocampus, thereby supporting the conclusion that normal memory loss with age is related to progressive hippocampal dysfunction.
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PMID:A neuropsychological analysis of memory loss with age. 306 60

This article, basing on experimental analysis and clinical observations, focuses on the role of subcortical structures in memory processes. It explained terminological problems and defined terms of memory: immediate, delayed, recent, remote, declarative and procedural. The present article pointed out functional hemispheric specialization as a predicator of material-specific forms of memory. Neuroanatomical basis was revealed, especially limbic system with its connections to prefrontal, cortical and brain stem regions. Amnesic Korsakoff and Wernicke syndromes, transient global amnesia, memory loss after bilateral damage of temporal lobes and after anterior communicating artery aneurysm rupture, were also discussed. Next part exhibited current knowledge about definition of dementia which may be caused by many multi-focal brain diseases like multiinfarct (vascular) dementia, Parkinson disease, Huntington disease, and sclerosis multiplex, and compared to Alzheimer disease. Term of dementia was defined, according to Cummings and Benson, as syndrome of acquired intellectual dysfunction when three of the following mental functions are impaired: language, memory, visuospatial skills, emotion, and cognition (abstraction, calculation, judgement). There is little doubt that various subcortical diseases are characterised by similar, no specific dysfunctions of cognitive processes including: disturbed attention and concentration, slowness of mental processing, forgetfulness, personality alterations and mood disturbances as well as motivational impairment, visuospatial disturbances, absence of symptoms of cortical dysfunction such as aphasia, agnosia and apraxia and associated motor disorder. Review of the literature suggests that rapid forgetting and retrieval deficits are most often symptoms of memory deficits observed after subcortical brain injuries.
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PMID:[Neuropsychological description of memory impairment following cortical and subcortical brain injuries]. 756 22

Three experiments were conducted to investigate the characteristics of retrograde amnesia (RA) induced by concussion in rats. In Experiment 1, rats receiving experimental concussion shortly after training in a single punishment trial exhibited severe forgetting on a retention test 48 h later. In the second experiment, rats receiving a concussion within 6 h after training showed severe RA, while those receiving concussion one day to five days after training exhibited progressively weaker amnesia. In Experiment 3, amnesic animals in one group received pretest noncontingent foot shock as a reminder treatment. This pretest cue significantly increased the cross-through latency, thus indicating a reduction in the memory deficit resulting from concussion. These results suggest that experimental concussion can be an effective method to induce retrograde memory loss in rats; that the RA caused by concussion is time-dependent; and that concussion-induced RA can be alleviated by a pretest cue indicating that the underlying mechanism of concussion-induced RA is more likely to be a retrieval deficit than a consolidation failure.
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PMID:Concussion-induced retrograde amnesia in rats. 765 31

In research on directed forgetting in pigeons using delayed matching procedures, remember cues, presented in the delay interval between sample and comparisons, have been followed by comparisons (i.e., a memory test), whereas forget cues have been followed by one of a number of different sample-independent events. The source of directed forgetting in delayed matching to sample in pigeons was examined in a 2 x 2 design by independently manipulating whether or not forget-cue trials in training ended with reinforcement and whether or not forget-cue trials in training included a simultaneous discrimination (involving stimuli other than those used in the matching task). Results were consistent with the hypothesis that reinforced responding following forget cues is sufficient to eliminate performance deficits on forget-cue probe trials. Only when reinforcement was omitted on forget-cue trials in training (whether a discrimination was required or not) was there a decrement in accuracy on forget-cue probe trials. When reinforcement is present, however, the pattern of responding established during and following a forget cue in training may also play a role in the directed forgetting effect. These findings support the view that much of the evidence for directed forgetting using matching procedures may result from motivational and behavioral artifacts rather than the loss of memory.
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PMID:Most directed forgetting in pigeons can be attributed to the absence of reinforcement on forget trials during training or to other procedural artifacts. 771 47

Loss of memory for the characteristics of stimuli (i.e., forgetting of stimulus attributes) can lead to increases in behavior, a consequence quite different from the impairments associated with the forgetting of responses. Evidence from animal and human research for the forgetting of stimuli as a distinct memory principle is presented, and the methodological and conceptual implications of this pervasive type of memory loss are considered. Malleability of eyewitness memory, cognitive confusions, sleeper and familiarity effects, and temporal distortions in inferences and attributions are among the varied behavioral phenomena that can be accounted for in terms of forgetting of stimulus attributes.
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PMID:Memory. When less is more. 798 85


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