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Source: Neuropsychologia
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Total 127 results found since Jan 2013.
Functional modulation of contralateral bias in early and object-selective areas after stroke of the occipital ventral cortices
Publication date: Available online 9 December 2016 Source:Neuropsychologia Author(s): Maren Praß, Cathleen Grimsen, Manfred Fahle Object agnosia is a rare symptom, occurring mainly after bilateral damage of the ventral visual cortex. Most patients suffering from unilateral ventral lesions are clinically non-agnosic. Here, we studied the effect of unilateral occipito-temporal lesions on object categorization and its underlying neural correlates in visual areas. Thirteen non-agnosic stroke patients and twelve control subjects performed an event-related rapid object categorization task in the fMRI scanner where images were ...
Source: Neuropsychologia - December 8, 2016 Category: Neurology Source Type: research
Are semantic and phonological fluency based on the same or distinct sets of cognitive processes? Insights from factor analyses in healthy adults and stroke patients
In this study, we therefore applied a German version of the verbal fluency task with 8 semantic (i.e. categories) and 8 phonological items (i.e. letters). An exploratory factor analysis with oblique rotation in N = 69 healthy young adults indeed revealed a two-factor solution with markedly different loadings for semantic and phonological items. This pattern was corroborated by a confirmatory factor analysis in a sample of N = 174 stroke patients. As results from both samples also revealed a substantial portion of common variance between the semantic and phonological factor, the present data further demonstrate that semanti...
Source: Neuropsychologia - February 28, 2017 Category: Neurology Source Type: research
Structural connectivity subserving verbal fluency revealed by lesion-behavior mapping in stroke patients
Publication date: Available online 8 May 2017 Source:Neuropsychologia Author(s): Mingyang Li, Yumei Zhang, Luping Song, Ruiwang Huang, Junhua Ding, Yuxing Fang, Yangwen Xu, Zaizhu Han Tests of verbal fluency have been widely used to assess the cognitive functioning of persons, and are typically classified into two categories (semantic and phonological fluency). While widely-distributed divergent and convergent brain regions have been found to be involved in semantic and phonological fluency, the anatomical connectivity underlying the fluency is not well understood. The present study aims to construct a comprehensive white...
Source: Neuropsychologia - May 10, 2017 Category: Neurology Source Type: research
Over- and underestimation of motor ability after a stroke: Implications for anosognosia
Publication date: Available online 9 August 2018Source: NeuropsychologiaAuthor(s): Elizabeth A. Fowler, Sergio Della Sala, Simon R. Hart, Robert D. McIntoshAbstractWe administered a discrepancy-based measure of anosognosia for hemiplegia (AHP) to a group of 42 right-brain-damaged (RBD) and left-brain-damaged (LBD) stroke patients with varying levels of functional motor ability. In addition to the expected anosognosic pattern of overestimation of motor function in some RBD patients, we found an equal and opposite underestimation in some others, both RBD and LBD. We also found that around a quarter of self-estimation error c...
Source: Neuropsychologia - August 10, 2018 Category: Neurology Source Type: research
Effect of Meaning on ApraxicFinger Imitation Deficits
Publication date: Available online 23 December 2015 Source:Neuropsychologia Author(s): E.I.S. Achilles, G.R. Fink, M.H. Fischer, A. Dovern, A. Held, D.C. Timpert, C. Schroeter, K. Schuetz, C. Kloetzsch, P.H. Weiss Apraxia typically results from left-hemispheric (LH), but also from right-hemispheric (RH) stroke, and often impairs gesture imitation. Especially in LH stroke, it is important to differentiate apraxia-induced gesture imitation deficits from those due to co-morbid aphasia and associated semantic deficits, possibly influencing the imitation of meaningful (MF) gestures. To explore this issue, we first i...
Source: Neuropsychologia - December 23, 2015 Category: Neurology Source Type: research
Effect of meaning on apraxic finger imitation deficits
Publication date: February 2016 Source:Neuropsychologia, Volume 82 Author(s): E.I.S. Achilles, G.R. Fink, M.H. Fischer, A. Dovern, A. Held, D.C. Timpert, C. Schroeter, K. Schuetz, C. Kloetzsch, P.H. Weiss Apraxia typically results from left-hemispheric (LH), but also from right-hemispheric (RH) stroke, and often impairs gesture imitation. Especially in LH stroke, it is important to differentiate apraxia-induced gesture imitation deficits from those due to co-morbid aphasia and associated semantic deficits, possibly influencing the imitation of meaningful (MF) gestures. To explore this issue, we first investigat...
Source: Neuropsychologia - January 21, 2016 Category: Neurology Source Type: research
The effect of cortical and subcortical lesions on spontaneous expression of memory-encoded and emotionally infused information: Evidence for a role of the ventral stream
Publication date: Available online 8 May 2017 Source:Neuropsychologia Author(s): Efthymia Efthymiopoulou, Dimitrios S. Kasselimis, Apostolia Ghika, Andreas Kyrozis, Christos Peppas, Ioannis Evdokimidis, Michael Petrides, Constantin Potagas The ventral stream of language processing has been implicated in the spontaneous expression of memory-encoded and emotionally infused information. The present study investigated whether left hemispheric lesions in post-stroke right-handed aphasic patients may be selectively associated with specific language functions. Speech rate was assessed with two tasks, one based on autobiographica...
Source: Neuropsychologia - May 10, 2017 Category: Neurology Source Type: research
Deficient body structural description contributes to apraxic end-position errors in imitation
Publication date: Available online 29 July 2019Source: NeuropsychologiaAuthor(s): Hormos Salimi Dafsari, Anna Dovern, Gereon R. Fink, Peter H. WeissAbstractApraxia is a common cognitive deficit after left hemisphere (LH) stroke. It has been suggested that a disturbed representation of the human body underlies apraxic imitation deficits. Thus, we here tested the hypothesis that a deficient body structural description (BSD), i.e., a deficient representation of a body part's position (relative to a standard human body), contributes to apraxic end-position errors in imitation, while controlling for deficits in the semantic rep...
Source: Neuropsychologia - July 30, 2019 Category: Neurology Source Type: research
Clinical impact of gait training enhanced with visual kinematic biofeedback: Patients with Parkinson’s disease and Patients stable post stroke☆
Publication date: Available online 22 April 2015 Source:Neuropsychologia Author(s): Nancy Byl , Wenlong Zhang , Sophia Coo , Masayoshi Tomizuka As the world’s population ages, falls, physical inactivity, decreased attention and impairments in balance and gait arise as a consequence of decreased sensation, weakness, trauma and degenerative disease. Progressive balance and gait training can facilitate postural righting, safe ambulation and community participation. This small randomized clinical trial evaluated if visual and kinematic feedback provided during supervised gait training would interfere or enhance mobility, e...
Source: Neuropsychologia - April 22, 2015 Category: Neurology Source Type: research
Familiarity with visual forms contributes to a left-lateralized and increased N170 response for Chinese characters
Publication date: Available online 19 September 2019Source: NeuropsychologiaAuthor(s): Licheng Xue, Urs Maurer, Xuchu Weng, Jing ZhaoAbstractWhile skilled readers produce an increased and left-lateralized event-related-potential (ERP) component, known as N170, for strings of letters compared to strings of less familiar units, it remains unclear whether perceptual familiarity plays an important role in driving increased and left-lateralized N170 for print. The present study addressed this issue by examining N170 responses for regular Chinese characters and cursive Chinese characters which are visually less familiar regardin...
Source: Neuropsychologia - September 20, 2019 Category: Neurology Source Type: research
Cortical and subcortical contributions to state- and strength-based perceptual judgments
Publication date: November 2014 Source:Neuropsychologia, Volume 64 Author(s): Mariam Aly , Murielle Wansard , Fermín Segovia , Andrew P. Yonelinas , Christine Bastin Perceptual judgments can be made on the basis of different kinds of information: state-based access to specific details that differentiate two similar images, or strength-based assessments of relational match/mismatch. We explored state- and strength-based perception in eleven right-hemisphere stroke patients, and examined lesion overlap images to gain insight into the neural underpinnings of these different kinds of perceptual judgments. Patients and healt...
Source: Neuropsychologia - November 3, 2014 Category: Neurology Source Type: research
CNV amplitude as a neural correlate for stuttering frequency: A case report of acquired stuttering
In conclusion, late CNV amplitude elicited by a relatively simple speech task seems to be able to provide an objective, neural correlate of stuttering frequency. The present case report supports the hypothesis that motor preparation has an important role in stuttering.
Source: Neuropsychologia - November 3, 2014 Category: Neurology Source Type: research
Parietal lesion Effects on cued recall following pair associate learning
Publication date: Available online 18 May 2015 Source:Neuropsychologia Author(s): Shir Ben-Zvi , Nachum Soroker , Daniel A. Levy We investigated the involvement of the posterior parietal cortex in episodic memory in a lesion-effects study of cued recall following pair-associate learning. Groups of patients who had experienced first-incident stroke, generally in middle cerebral artery territory, and exhibited damage that included lateral posterior parietal regions, were tested within an early post-stroke time window. In three experiments, patients and matched healthy comparison groups executed repeated study and cued reca...
Source: Neuropsychologia - May 20, 2015 Category: Neurology Source Type: research
The relationship between novel word learning and anomia treatment success in adults with chronic aphasia
Discussion This is the first group study to directly examine the relationship between novel word learning and therapy outcomes for anomia rehabilitation in adults with aphasia. Importantly, we found that novel word learning performance was correlated with therapy outcomes. We propose that novel word learning ability may contribute to the initial acquisition of treatment gains in anomia rehabilitation.
Source: Neuropsychologia - December 25, 2015 Category: Neurology Source Type: research
The Relationships between the amount of spared tissue, percent signal change, and accuracy in semantic processing in aphasia
This study included 14 persons with aphasia in the chronic stage of recovery (six or more months post stroke), along with normal controls, who performed semantic processing tasks of determining whether a written semantic feature matched a picture or whether two written words were related or not. Using region of interest (ROI) analysis, we found that left inferior frontal gyrus pars opercularis and pars triangularis, despite significant damage, were the only regions to correlate with behavioral accuracy. Additionally, bilateral frontal regions including superior frontal gyrus, middle frontal gyrus, and anterior cingulate ap...
Source: Neuropsychologia - January 13, 2016 Category: Neurology Source Type: research
