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PubMed2004

African American acculturation and neuropsychological test performance following traumatic brain injury.

The present study examined the influence of African American acculturation on the performance of neuropsychological tests following traumatic brain injury (TBI). Seventy one participants already enrolled in a larger-scale study assessing the impact of TBI (i.e., the South Eastern Michigan Traumatic Brain Injury Model Systems project) completed a self-report measure of African American acculturation (African American Acculturation Scale-Short Form; Landrine & Klonoff, 1995) in addition to a standardized battery of neuropsychological tests. Hierarchical regression analyses were conducted to evaluate the relationship between level of acculturation and test performance after controlling for injury-related (initial Glasgow Coma Scale score, time since injury) and demographic variables (age, sex, years of education, and socioeconomic status). Lower levels of acculturation were associated with significantly poorer performances on the Galveston Orientation & Amnesia Test, MAE Tokens test, WAIS-R Block Design, Rey Auditory Verbal Learning Test, and Symbol Digit Modalities Test. Decreased levels of acculturation were also significantly related to lower scores on a composite indicator of overall neuropsychological test performance. In addition, the examiner's ethnicity (Black or White) was related with scores on a few of the tests (i.e., Block Design, Trail Making Test), but was not significantly associated with the overall neuropsychological test performance. Overall, these findings suggest that differences in cultural experience may be an important factor in the neuropsychological assessment of African Americans following TBI, and provide additional support for the hypothesis that cultural factors may partially account for the differences among ethnic/cultural groups on neuropsychological tests.

Acculturation↗
PubMed2004

A double-blind, placebo controlled, cross-over trial of adjunctive donepezil for cognitive impairment in schizophrenia.

Although there have been several case reports suggesting the beneficial effect of acetylcholinesterase inhibitors in the cognitive deficits seen in schizophrenia, controlled studies have revealed contradictory results. The aim of this study was to investigate if donepezil could improve cognitive functions in schizophrenia. Twelve schizophrenic patients, who were diagnosed according to DSM-IV criteria and who had been on a stable dose of a high-potency typical antipsychotic for a minimum period of 3 months, participated in this 12-wk double-blind, placebo controlled, cross-over study of donepezil adjunctive treatment. Patients were randomly assigned under double-blind conditions to receive 5 mg/d donepezil or placebo for 6 wk, and then were crossed over to the alternate condition for 6 additional weeks. At baseline, 6 and 12 wk, patients were evaluated with the Positive and Negative Syndrome Scale (PANSS), Calgary Depression Scale, the Wechsler Memory Scale Revised (WMS-R), a test for Verbal Fluency, Trail Making Test, Parts A and B, and Wisconsin Card Sorting Test (WCST). Treatment effect was not significant in any of the cognitive measures. There were also no significant changes in the PANSS and depression scores. Nicotinic receptor desensitization may cause non-responsiveness to acetylcholine as previously suggested, but the most likely explanation appears to be that defects in other neurotransmitter systems account for the cognitive deficits seen in schizophrenic patients.

Adult↗
PubMed2002

Chronic alcoholism and the frontal lobe: which executive functions are imparied?

OBJECTIVE: Over the last decade, various hypotheses have been advanced concerning the cognitive functions affected by chronic alcoholism. The aim of this study was to identify the pattern of executive function impairment in chronic alcoholism, shedding light on possible differences between specific functions related to the frontal lobe. METHODS: Twenty-two male alcoholics and 22 controls, matched for age, educational level and IQ, were enrolled in the study. MMPI and a battery of neuropsychological tests [i.e. digit symbol, trail making test, Stroop test, digit cancellation test, Wisconsin card sorting test (WCST), simple and choice reaction times] for assessing frontal lobe functioning were administered. RESULTS: The alcoholics were found to be impaired in a wide range of executive domains, with the exception of the Stroop test, which nevertheless showed a trend towards statistically significant differences between patients and controls. CONCLUSION: With the exception of aggression - our subjects did not have high aggression scale scores - the 'frontal lobe hypothesis', according to which alcoholic patients are impaired on function tests related to the frontal lobe, was therefore confirmed in our sample.

Adult↗
PubMed2001

Neuropsychological performance of psychotic patients in community care: results from the UK700 study.

OBJECTIVE: To compare cognitive performance in chronic schizophrenic and affective psychotic patients maintained in community care. METHOD: We studied a sample of community-based patients (n = 707) with chronic psychotic disorders. Neuropsychological assessment was completed using the National Adult Reading Test (NART) and the Trail Making Test (TMT). RESULTS: Affective psychotic patients had higher premorbid IQ than schizophrenic patients before adjustment for confounding factors (P=0.03); however, after adjustment for ethnic group and social class this became non-significant (P=0.19). There were no significant differences between groups on the TMT, parts A or B. CONCLUSION: Unlike studies suggesting that schizophrenic patients are more cognitively impaired than affective psychotic patients, our study suggests a degree of cognitive homogeneity between those patients who develop a chronic illness. Measures of premorbid IQ suggest that this cognitive homogeneity exists prior to the onset of illness.

Adult↗
PubMed1995

Frontal lobe lesions, diffuse damage, and neuropsychological functioning in traumatic brain-injured patients.

This study quantified lesion volume in relation to damage location and executive functioning in traumatic brain-injured (TBI) patients. Magnetic resonance (MR) scans of 68 TBI patients were analyzed by taking volumetric measures of lesion sites. Patients were grouped according to the presence/absence of frontal lobe lesions. Measures of frontal lesion volume were studied as predictors for outcome on designated tests of executive functioning (Halstead Category Test and Wisconsin Card Sorting Test). Results showed no significant differences in level of deficit between groups. In addition, no significant differences were found between groups on other tests of neuropsychological functioning (Trail Making Test, Parts A and B, and Wechsler Adult Intelligence Scale-Revised). These results suggest that tests that are traditionally used to detect "frontal lobe" damage may not be adequate for distinguishing specific frontal lobe dysfunction, and do not add anything unique about frontal lobe integrity and neuropsychological functioning in TBI patients.

Brain Damage, Chronic↗
PubMed2005

The executive interview as a screening test for executive dysfunction in patients with mild dementia.

OBJECTIVES: To validate the Executive Interview (EXIT25) as a screening instrument for executive cognitive dysfunction in patients with mild dementia. DESIGN: Validation using group comparison and correlation studies. SETTING: The Copenhagen University Hospital Memory Clinic, a multidisciplinary outpatient clinic based in a neurological setting. PARTICIPANTS: Thirty-three patients with mild dementia (MMSE score > or =20) and 30 healthy controls. MEASUREMENTS: The EXIT25, a 25-item screening instrument for executive dysfunction, was administered to all participants. Global cognitive function was measured using the MMSE. Patients were evaluated using traditional neuropsychological tests for executive dysfunction (Wisconsin Card Sorting Test, Trail Making Part B, Stroop Test, verbal fluency, design fluency, and verbal abstraction). Changes in behavior and functional impairment in activities of daily living were assessed using the Frontal Behavioral Inventory (FBI) and the Disability Assessment for Dementia Scale. RESULTS: EXIT25 scores were significantly higher in patients than in the healthy controls; MMSE scores could not account for the differences. Thirteen of the 25 items separated the two groups. EXIT25 was found to correlate significantly with the Stroop Test, the verbal fluency tests, and the FBI. CONCLUSION: The EXIT25 is able to capture executive cognitive deficits not primarily related to the general level of intellectual reduction in patients with mild dementia. In clinical practice, the EXIT25 might be a valuable supplement to the MMSE.

Aged↗
PubMed1978

Spontaneous variations in level of arousal among aged individuals. Correlations with functional abilities and mental performances.

The aim of this study was to assess whether spontaneous interindividual variations in arousal level appreciated by telemetric recordings of physiological variables were related to mental performance and functional ability in institutionalized aged subjects. The sample studied was made up of 18 subjects (16 women and 2 men) aged 82-97, living in an old age home in Paris. Telemetric recordings of EEG, EKG, EMG and EOG were obtained over 8-hour periods, during the subjects' normal daily activity schedule. The Stockton Geriatric Rating Scale (SGRS), Benton's Visual Retention Test (VRT) and the Trail Making Test (TMT) were independently used to assess behaviour and mental performance of these aged persons. All correlations between telemetric data and psychological evaluations (the psychometric tests as well as the rating scale) were highly significant, even once the influence of the cultural level was controlled.

Activities of Daily Living↗
PubMed2006

Preservation of cognitive function in dystonia treated by pallidal stimulation.

OBJECTIVE: To assess the effects of bilateral pallidal deep brain stimulation (DBS) on mood and cognitive performance in patients with dystonia before surgery (at baseline, while patients received their usual treatment) and 12 months postoperatively (while patients received neurostimulation and their medications) in a multicenter prospective study. METHODS: Twenty-two patients with primary generalized dystonia were evaluated with tests focused on executive functions. The authors considered the patients' severe disability and selected the following tests: Raven Progressive Matrices 38, Similarities and Arithmetic subtests of the Wechsler Adult Intelligence Scale-R, Grober and Buschke, Wisconsin Card Sorting Test (WCST), verbal fluency, Trail Making Test, and the Beck Depression Inventory. Median age at surgery was 30 years (range = 14 to 54 years), median duration of disease was 18.5 years (range = 4 to 37 years). RESULTS: Before surgery, no patients showed cognitive decline or depression. The surgical procedure appeared to be benign cognitively. One year after surgery, free recall improved. There was a significant reduction in the number of errors in the WCST. No behavioral or mood changes were found. CONCLUSIONS: Bilateral pallidal stimulation has a good benefit-to-risk ratio as it did not negatively affect cognitive performance and mood in primary dystonia, while a significant motor improvement was obtained. Moreover, a significant mild improvement in executive functions was observed, which may have been related either to the surgical treatment or to the marked decrease in anticholinergic drugs.

Adolescent↗
PubMed2004

Contribution to the evaluation of language disturbances in subcortical lesions: a pilot study.

Subcortical structures are in a strategic functional position within the cognitive networks and their lesion can interfere with a great number of functions. In this study, we describe fourteen subjects with exclusively subcortical vascular lesions (eight in the basal ganglia and six in the thalamus) and the interrelation between their language alterations and other cognitive abilities, as attention, memory and frontal executive functions. All patients were evaluated through the following batteries: Boston Diagnostic Aphasia Examination, Boston Naming Test, Token Test, Benton Visual Retention Test, Trail Making, Wisconsin Card Sorting Test and a frontal scripts task. All patients underwent MRI and twelve underwent SPECT. Results show that these patients present impairment in several cognitive domains, especially attention and executive functions. These alterations affect language abilities, and this fact must be considered in the rehabilitation efforts.

Adult↗
PubMed2005

Electronystagmography outcome and neuropsychological findings in tinnitus patients.

Because psychological aspects often are underscored in the generation of tinnitus, we assessed the neuropsychological status in our group of patients. We found an increased number of abnormal electronystagmography (ENG) recordings in tinnitus patients. The aim of this study was to compare the ENG outcome with the patients' neuropsychological status. We carried out the study on 69 subjects complaining of tinnitus and on 43 healthy persons. We performed clinical neurootological examinations and ENG tests on all patients. Neuropsychological evaluation was conducted by means of the Beck Depression Inventory (BDI), the Hospital Anxiety and Depression (HAD) test, the Mini Mental Status (MMS) test, and the Trail-Making Test (TMT). In 46 patients (66.6%), we found abnormal ENG outcomes (central, 42%; peripheral, 13.0%; mixed, 11.6%). Neuropsychological tests revealed abnormal scores: for the BDI, 43.5% of patients; for the HAD-A, 72.5%; for the HAD-D, 47.8%; for the MMS, 27.5%; and for the TMT, 55.1%. We did not find correlation between the ENG outcomes and neuropsychological test scores. We did not find correlation between the overall ENG outcomes and neuropsychological test scores, with one exception; we found the occurrence of abnormal neuropsychological test scores and the ENG outcome indicating central vestibular dysfunction. Our study showed that despite a high frequency of vestibular system dysfunction signs and a high incidence of abnormal neuropsychological test scores in tinnitus patients, only one correlation existed between these two results.

Adult↗
PubMed1981

Neuropsychological assessment and EEG sleep in affective disorders.

The neuropsychological test performance of 76 hospitalized, depressed patients meeting RDC for the presence of affective disorder was assessed as part of a protocol involving amitryptyline (n = 53) or placebo (n = 23). Tests included the Trail-making Test (TMT), the Benton Visual Retention Test, and the Shipley-Hartford Scale. Clinical ratings and data concerning the characteristics of EEG sleep were also obtained. Analysis of data collected after a drug-free period of 2 weeks and again at the end of the protocol yielded the following conclusions. Base-line performance was inferior to norms for these tests, but for the TMT, scores were not as poor as that expected for brain-damaged patients. Poor performance was often associated with older age, the presence of psychotic features, and prolonged sleep latencies. Baseline Hamilton Rating Scale (HRS) was predicted best by TMT part B. However, this association was not as strong as that between HRS and poor sleep efficiency. Treatment with drug or placebo had little differential effect upon test performance over the course of the protocol. It is suggested that further research should utilize tests which have specificity in localizing cerebral lesions, so that any focal deficits in brain function in depression might be identified.

Adult↗
PubMed2000

Age effects on executive ability.

Heterogeneity of executive tasks has made it difficult to determine whether there are age-related declines in executive functioning. To address this issue, 112 individuals, 20-79 years old, took the California Trail Making Test (CTMT) and the California Stroop Test (CST), subtests of the Delis-Kaplan Executive Function Scale (D. C. Delis, E. Kaplan, & J. H. Kramer, in press) that include measurement of component skills embedded in the executive function tasks. Multiple regression analyses revealed that after controlling for component skills, age had a significant effect on the executive requirement of the CST, namely speed on the interference condition. Age did not affect switching performance on the letter-number condition of the CTMT. Additional analyses revealed that age was significantly associated with commission of certain types of errors. This study confirms the importance of partialing out components in the assessment of multidimensional cognitive tasks, particularly when making age comparisons. It also emphasizes specificity over generalizability when examining the impact of age on cognition.

Adult↗
PubMed2006

Can high-risk older drivers be identified through performance-based measures in a Department of Motor Vehicles setting?

OBJECTIVES: To evaluate the relationship between performance-based risk factors and subsequent at-fault motor vehicle collision (MVC) involvement in a cohort of older drivers. DESIGN: Prospective cohort study. SETTING: Motor Vehicle Administration (MVA) field sites in Maryland. PARTICIPANTS: Of the 4,173 older drivers invited to participate in the study, 2,114 individuals aged 55 to 96 agreed to do so. These analyses focus on 1,910 individuals recruited through MVA field sites. MEASUREMENTS: Gross Impairment Screening Battery, which included Rapid Pace Walk, Head/Neck Rotation, Foot Tap, Arm Reach, Cued Recall, Symbol Scan, Visual Closure subtest of the Motor Free Visual Perception Test (MVPT), Delayed Recall, and Trail Making Test with an Abbreviated Part A and standard Part B; Useful Field of View (UFOV) subtest 2; a Mobility Questionnaire; and MVC occurrence. RESULTS: In drivers aged 55 and older with intact vision (20/70 far visual acuity and 140 degrees visual field), age, sex, history of falls, and poorer cognitive performance, as measured using Trails B, MVPT, and UFOV subtest 2, were predictive of future at-fault MVC involvement. After adjusting for annual mileage, participants aged 78 and older were 2.11 as more likely to be involved in an at-fault MVC, those who made four or more errors on the MVPT were 2.10 times as likely to crash, those who took 147 seconds or longer to complete Trails B were 2.01 times as likely to crash, and those who took 353 ms or longer on subtest 2 of the UFOV were 2.02 times as likely to incur an at-fault MVC. Older adults, men, and individuals with a history of falls were more likely to be involved in subsequent at-fault MVCs. CONCLUSION: Performance-based cognitive measures are predictive of future at-fault MVCs in older adults. Cognitive performance, in particular, is a salient predictor of subsequent crash involvement in older adults. High-risk older drivers can be identified through brief, performance-based measures administered in a MVA setting.

Accidents, Traffic↗
PubMed2005

Executive control of working memory in schizophrenia.

There is considerable evidence that working memory impairment is a common feature of schizophrenia. The present study assessed working memory and executive function in 54 participants with schizophrenia, and a group of 54 normal controls matched to the patients on age, gender and estimated premorbid IQ, using traditional and newer measures of executive function and two dual tasks-Telephone Search with Counting and the Memory Span and Tracking Task. Results indicated that participants with schizophrenia were significantly impaired on all standardised measures of executive function with the exception of a composite measure of the Trail Making Test. Results for the dual task measures demonstrated that while the participants with schizophrenia were unimpaired on immediate digit span recall over a 2-min period, they recalled fewer digit strings and performed more poorly on a tracking task (box-crossing task) compared with controls. In addition, participants with schizophrenia performed more poorly on the tracking task when they were required to simultaneously recall digits strings than when they performed this task alone. Contrary to expectation, results of the telephone search task under dual conditions were not significantly different between groups. These results may reflect the insufficient complexity of the tone-counting task as an interference task. Overall, the present study showed that participants with schizophrenia appear to have a restricted impairment of their working memory system that is evident in tasks in which the visuospatial sketchpad slave system requires central executive control.

Adult↗
PubMed1996

The effects of amantadine and pemoline on cognitive functioning in multiple sclerosis.

BACKGROUND: Amantadine hydrochloride and pemoline, both frequently used to treat the fatigue of multiple sclerosis (MS), may also improve attention and other cognitive functions in MS. To our knowledge, these agents have never been compared in a placebo-controlled trial of patients with MS. OBJECTIVE: To evaluate the effects of amantadine and pemoline on cognitive functioning in MS. METHODS: A total of 45 ambulatory patients with MS and severe fatigue were treated for 6 weeks with amantadine, pemoline, or placebo using a parallel group design. They underwent comprehensive neuropsychological testing to determine treatment effects on cognitive functioning. Primary outcome measures were tests of attention (Digit Span, Trail Making Test, and Symbol Digit Modalities Test), verbal memory (Selective Reminding Test), nonverbal memory (Benton Visual Retention Test), and motor speed (Finger Tapping Test). RESULTS: Fatigue did not significantly correlate with any of the neuropsychological outcome measures at baseline or after treatment. All three treatment groups improved on tests of attention (P < .003), verbal memory (P < .001), and motor speed (P < .002). There were no significant differences between amantadine, pemoline, and placebo. CONCLUSIONS: Cognitive functioning in MS is independent of fatigue. Neither amantadine nor pemoline enhances cognitive performance in MS compared with placebo.

Adolescent↗
PubMed1998

Structural and functional meta-analytic evidence for fronto-subcortical system deficit in progressive supranuclear palsy.

Meta-analytic methods were used to determine the most sensitive indexes to fronto-subcortical deficit in progressive supranuclear palsy (PSP) and to further characterize the neurocognitive and related features of PSP that can provide a basis of comparison to other disorders with prominent subcortical brain lesions. Studies dating back to 1984 were gathered and calibrated to compare the neuropsychological, neuroimaging, and neurophysiological test results from 229 patients with PSP, and 357 healthy controls. The tests most sensitive to fronto-subcortical deficit in PSP were mostly neuropsychological measures that include such tests as the Stroop Task, Trail Making Test Part A, and Purdue pegboard performance. We conclude that although neuropsychological measures may be most sensitive to deficits in PSP, they are also less specific and valid indicators of fronto-subcortical brain system integrity.

Aged↗
PubMedDate not supplied

Cognitive function in hypertensives treated with atenolol or propranolol.

STUDY OBJECTIVE: To test reports that beta blockers, particularly lipophilic forms, impair cognitive function and cause psychiatric disturbances. DESIGN: Randomized, double-blind, controlled crossover trial with eight-week treatment periods. PATIENTS: Sequential sample of 42 male veterans, with untreated diastolic blood pressures (DBP) between 90 and 110 mmHg, aged 35-64 years. INTERVENTIONS: Propranolol-LA, 80-mg tablets, or atenolol, 50-mg tablets, were given daily, incremented by one tablet at weekly intervals until DBP less than or equal to 90 mmHg. Hydrochlorothiazide was added, if necessary. MAIN RESULTS: Repeated-measures ANOVA was performed on all cognitive tests. Cognitive test performance was not affected by beta blocker therapy in seven of nine tests and was enhanced on Trail Making Test. Performance was impaired only on Digit Cancellation. Neither Speilberger's State Trait Anxiety Inventory nor the Beck Depression Inventory was affected by either beta blocker. CONCLUSIONS: Atenolol or propranolol therapy does not impair cognitive function or contribute significantly to psychiatric side effects.

Analysis of Variance↗
PubMed2005

[The neurobehavioral rating scale-revised: assessment of concurrent validity].

UNLABELLED: Cognitive and behavioral impairment are a major source of disability in daily living of patients with traumatic brain injury (TBI). The Neurobehavioral Rating Scale-Revised (NRS-R) is a short, easy-to administer interview tool developed to improve assessment by clinicians. Data are available on its criterion validity and reliability, but the concurrent validity of the French NRS-R was not yet documented. OBJECTIVE: To assess the concurrent validity of the NRS-R with current psychometric tests. METHOD: One hundred and four patients with TBI enrolled in a community adjustment program underwent concurrent examination with the NRS-R, cognitive tests assessing memory, attention, and executive functions, and scales of anxiety (STAI) and depressive mood (CES-D). Intercorrelations were undertaken between these variables and the five factors of the NRS-R: F1, intentional behavior; F2, lowered emotional state; F3, survival-oriented behaviour/hightened emotional state; F4, arousal state; and F5, language. Patients were 82 men and 22 women, the mean age was 28.5 years, and 70% had severe TBI (Glasgow coma score [GCS] below 8 on admission). They were assessed 52 months on average after their injury. RESULTS: Factor F1 was correlated with results on the GCS (P<0.05), the Tower of London test (TL, P<0.01), the Trail Making Test (TMT, P<0.01), divided attention (DA) and inhibition (IN) subscales of the Zimmermann and Fimm's Attention battery (TEA) (P<0.01) and reverse digit span (DS, P<0.05). Factor F2 was positively related to age at injury, time since injury (TSI) (P<0.05) and CESD and STAI scores (P<0.001). Factor F3 was related to DA (P<0.01) TL scores and TSI (P<0.05). Factor F4 was related to TL, TMT, DA, flexibility, DS (P<0.05), TSI, duration of post-traumatic amnesia, CES-D score (P<0.05) and STAI scores (P<0.01). Factor F5 was related to GCS, DA (P<0.05), and reaction time on the subscales IN and Go/nogo (GO) of the TEA battery (P<0.01). The NRS-R total score was related to CESD, STAI scores, TMT score, DA (P<0.01) and TL score, IN and GO scores and TSI (P<0.05). DISCUSSION: As McCauley et al found with the English version of the NRS-R, significant relationships were found between NRS-R factor scores, cognitive tests and emotional scales. Relationships were also found between factor scores and indicators of injury severity and time since injury. These data suggest fair concurrent validity of the NRS-R.

Adolescent↗