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PubMed1996

Serial position effects in visual short-term memory for words and abstract spatial patterns.

Two experiments tested the effects of list position, and retention-interval in recognition for two distinct stimulus categories in young adults. Stimulus categories were spatial abstract patterns and words presented on a computer screen. At short delay intervals recency effects predominates and at longer delay intervals a primacy effect predominates in both experiments, indicating similar basic memory processes producing the serial position functions for the two different categories of visual stimuli, but as length of retention-interval increases, memory for first list items improves for words and remains constant for abstract patterns. Recency functions are similar for both stimulus categories tested.

Adult↗
PubMed2006

Towards a typology of specific language impairment.

BACKGROUND: The population of children with specific language impairments (SLI) is heterogeneous. The present study was conducted to examine this heterogeneity more closely, by identifying and describing subgroups within the population of children with SLI in the Netherlands. METHOD: A broad battery of language tests and language-related cognitive tests were administered to 147 six-year-old and 136 eight-year-old children with SLI. RESULTS: Factor analyses revealed 4 factors indicating 4 distinctive linguistic domains for both age samples: 1) lexical-semantic abilities, 2) auditory conceptualization, 3) verbal sequential memory and 4) speech production. These empirical findings were further validated by the positive correlations found between the language factors and the judgments of teachers and speech therapists. Finally, a cluster analysis revealed 4 distinct clusters of SLI children for each sample with specific language profiles based on the 4 factors. Results were nearly the same for both age samples. CONCLUSIONS: The language problems that emerged from the two samples of children with SLI could be described as falling into four types. Based on these language types, four subgroups of children with SLI could be distinguished, each with a specific profile. Some subgroups had severe problems on one specific type of language problem; others had severe problems in more than one type of language problem when compared to the other subgroups of the same age sample. The different profiles may indicate that a more dynamic approach is needed in intervention, considering the presence of both compensating and restricting factors within each child with SLI.

Child↗
PubMed1991

The role of cirrhosis in memory functioning of alcoholics.

The effects of alcoholism and liver disease on memory functioning in alcoholics were studied by comparing four groups: normal healthy controls, alcoholics without liver disease, alcoholics with biopsy-confirmed cirrhosis, and nonalcoholics with postnecrotic cirrhosis. Memory capacity was evaluated employing the Benton Visual Retention Test (BVRT), the Rey-Osterreith Complex Figure Test, Digit Span, and the Brown Peterson four-word short-term memory test. A 2 x 2 ANOVA revealed significant main effects for both alcohol and cirrhosis on Digits Forward and the total score on the Brown Peterson test. Additionally, there were significant main effects for cirrhosis on the BVRT. The Brown Peterson test was analyzed using a repeated measures 2 x 2 ANOVA. Significant effects for cirrhosis were observed at all three interpolation periods. The effects for alcohol approached significance at the 30-sec (most difficult) interpolation period. Analysis of error patterns on the Brown Peterson test indicated that overall omission errors were most commonly made among all groups. Significant effects were found for alcohol on omissions and intrusion, while the cirrhosis factor yielded significant effects for phonemic, perseverative, and omission errors. This study demonstrates the importance of liver disease underlying the etiology of memory impairments in alcoholics. The results confirm our earlier findings that neuropsychologic deficits seen in alcoholics may be the result of the combination of alcohol abuse and liver disease.

Adult↗
PubMed1994

Subarachnoid blood on CT and memory dysfunctions in aneurysmal subarachnoid hemorrhage.

Ninety patients with a previous subarachnoid haemorrhage (SAH) were given a set of memory tests comprising immediate free recall of words (indexing long-term memory, LTM, and short-term memory, STM), final free recall of words (indexing LTM), final cued recall of words (indexing LTM), and a digit span test (indexing working memory, WM). Patients with a large amount of blood on CT, carried out within 72 h of the bleed, showed LTM as well as STM dysfunction, whereas patients with a small amount of subarachnoid blood evidenced only STM dysfunction. Patients with the ruptured aneurysm located on the anterior cerebral artery, however, constituted an exception with dysfunction of both LTM and STM together with intact WM, independent of the amount of subarachnoid blood. Also, patients with internal carotid artery or middle cerebral artery aneurysms and large volume SAH displayed LTM dysfunction, but differed concerning STM, the former showing intact STM and the latter showing STM dysfunction. Thus, it appears, that the combined information from factors such as the amount of subarachnoid blood and the location of the ruptured aneurysm is of vital importance for explaining the different patterns of memory dysfunctions after SAH.

Adult↗
PubMed1977

The effect of distractor strength versus rate of item presentation on retention in schizophrenics.

Predictions made from Chapman & McGhie's attentional dysfunction theory of schizophrenia were compared with those made from Yates' slow information processing theory. Retention in a free-recall, short-term memory task was studied with 20 chronic nonparanoid schizophrenics and 20 psychiatric controls matched on age, educational level and intelligence as subjects. Schizophrenics performed consistently poorer than controls, but no differences between groups were found as a function of either variation in distractor strength or in item presentation rate. Thus, neither theory was supported, but several uncontrolled aspects of the task variable were suggested as possible reasons for some of these conflicting findings.

Adult↗
PubMed1984

Serial position, rehearsal and recall in temporal lobe epilepsy.

Two auditory forms of the serial position curve (SPC) were administered to three groups of 20 subjects: normal and neurotic controls and chronic temporal lobe epileptics. In contrast to expectation, epileptics were especially poor on the recency portion of the curve. Evidence from a further 30 cases of temporal lobe damage suggested that the epileptics had rehearsed earlier items at the expense of later ones.

Adult↗
PubMed1987

The effect of concurrent articulation on memory span in Alzheimer-type dementia.

This study explored the effects of concurrent articulation on memory-span performance, comparing patients with early Alzheimer-type dementia (AD) and matched controls. Reduction in memory span due to concurrent articulation was the same in AD patients as controls, supporting the notion that the contribution of articulatory rehearsal to memory-span performance is undiminished in early AD.

Aged↗
PubMed1997

A note of caution for clinicians using the Paced Auditory Serial Addition Task.

In this study, a group of 30 university students were administered the Paced Auditory Serial Addition Task (PASAT) and their performance compared with that of an older group matched for ability on the National Adult Reading Test (NART). They were also compared on measures of memory (forwards and backwards digit span) and a timed visual search task. The younger participants showed significantly inferior performance on the PASAT. This is counter-intuitive considering that the test is viewed primarily as a measure of speed of processing. There were no differences on measures of short-term memory, but the older participants found fewer targets on the visual search task. The implications of this result for clinicians using the PASAT are discussed.

Adult↗