Mervi Jehkonen

Mervi Jehkonen
Tampere University | UTA · Faculty of Social Sciences

PhD, Docent in Neuropsychology

About

85
Publications
10,970
Reads
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2,115
Citations
Citations since 2017
10 Research Items
670 Citations
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
Introduction
Mervi Jehkonen currently works at the Faculty of Social Sciences, Tampere University. Their current projects are 'Stroke and cognition' and "Diabetes and cognition".
Additional affiliations
August 2007 - present
Tampere University
Position
  • Senior Researcher
August 2007 - present
Tampere University
Position
  • Senior Researcher

Publications

Publications (85)
Article
Full-text available
Objective: Mood- and stress-related disorders commonly cause attentional and memory impairments in middle-aged individuals. In memory testing, these impairments can be mistakenly interpreted as symptoms of dementia; thus, more reliable diagnostic approaches are needed. The present work defines the discriminant accuracy of the Dementia Apraxia Test...
Article
Objective: Limb apraxia is a common early sign of Alzheimer's disease (AD) and is thought to occur specifically in early-onset (before the age of 65) AD. The Dementia Apraxia Test (DATE), a test of limb and face praxis developed to support the differential diagnosis of dementia, has shown good diagnostic accuracy in detecting AD in older patients,...
Article
Full-text available
Patients with migraine often experience cognitive dysfunction during a migraine attack, but they have also been reported to complain about cognitive impairment after an attack and during the interictal period. Objective: The aim of this study was to determine what neuropsychological test methods are used to assess cognitive functioning in migraine...
Article
PURPOSE To investigate the literature for frequencies, profiles and neural correlates of limb and face apraxias in frontotemporal dementia (FTD). METHOD The search conducted in Ovid Medline, PsycINFO and Scopus yielded 487 non-duplicate records, 43 of which were included in the final analysis. RESULTS Apraxias are evident in diverse forms in all...
Chapter
This article presents an introduction to various manifestations of anosognosia, assessment methods, recovery and rehabilitation of this multifaceted syndrome. Anosognosia is known to be associated with various neurological and neuropsychological syndromes. Injuries in several cortical and subcortical brain areas can cause anosognosia, typically inv...
Article
Objectives: Type 2 diabetes mellitus has been linked with cognitive decrement and an increased risk of dementia in older people. Less is known about whether diabetes affects cognition at younger ages. The objective of this meta-analysis was to examine possible differences (effect sizes) in cognitive performance between middle-aged type 2 diabetic p...
Article
Full-text available
A review of patients with brain injury showing personal neglect is presented. The aim is to shed light on this aspect of neglect often unresearched or only indirectly investigated, and to discuss recent findings concerning the methods used to assess personal neglect, its neural correlates and its association with the more often explored aspect of e...
Article
Objectives: To examine the occurrence of and recovery from visual neglect-related symptoms with the focus on neglect laterality, ipsilateral orienting bias, and slowed processing speed in right hemisphere (RH) infarct patients during a 1-year follow-up. Furthermore, to propose guidelines for assessing processing speed alongside the Behavioural Ina...
Article
Full-text available
This study aims to elucidate the nature of cognitive deficits caused by intra-cranial tumors, as well as to examine how a surgical operation of the tumor may affect tumor-induced cognitive deficits. The patient group included 43 individuals with meningioma or low-grade glioma admitted to a surgical operation of the tumor. Neuropsychological examina...
Article
Full-text available
Objective: This prospective follow-up study aimed to identify sociodemographic and clinical factors that may affect the quality of life (QoL) of patients with acute ischemic stroke during a 6-month follow-up. Patients and methods: In the acute phase, sociodemographic and clinical data were collected using the National Institute of Health Stroke...
Article
The prevalence of anosognosia after stroke is approximately 30%. Anosognosia refers to the lack of awareness of illness or specific symptom of illness in patients with neurological diseases. Because stroke patients with anosognosia are not properly comprehending the nature of their medical situation, they may not seek treatment in time, which weake...
Article
To provide a comprehensive review of studies on information processing speed in patients with obstructive sleep apnea syndrome (OSAS) as compared to healthy controls and normative data, and to determine whether continuous positive airway pressure (CPAP) treatment improves information processing speed. A systematic review was performed on studies dr...
Article
Neglect is a common neuropsychological disorder after right hemisphere stroke. Neglect worsens the prognosis of functional recovery but responds well to targeted neuropsychological rehabilitation. Several methods for rehabilitation have been developed and research to-date lends best support to visual scanning training, prism adaptation, limb activa...
Article
The purpose of this study was to examine the reliability, validity and clinical usefulness of the Barrow Neurological Institute Fatigue Scale (BNI-FS) in patients with mild traumatic brain injuries (MTBI). Participants were 125 patients enrolled from the Emergency Department (ED) of Tampere University Hospital, Finland who had sustained an MTBI. Th...
Article
Full-text available
Visual neglect (VN) is a common consequence of right hemisphere (RH) stroke. The aims of this study were to explore the presence of VN after RH stroke in the patients with (T+) or without (T-) thrombolytic treatment, and to determine whether thrombolysis is a predictor of VN. The study group consisted of 77 RH infarct patients. VN was evaluated wit...
Article
Full-text available
In the acute phase of stroke, patients with left visual neglect (VN) automatically orient to the right hemispace. This study examined the presence of rightward bias after right hemisphere stroke within 10 days of stroke onset and after 6 months. Our sample comprised 43 patients and 49 healthy controls. Presence of VN was evaluated with the six conv...
Article
Full-text available
Objectives: The purpose of this study was to examine the reliability, validity and clinical usefulness of the Barrow Neurological Institute Fatigue Scale (BNI-FS) in patients with mild traumatic brain injuries (MTBI). Methods and procedure: Participants were 125 patients enrolled from the Emergency Department (ED) of Tampere University Hospital, Fi...
Article
Full-text available
The purpose of this study was to assess the predictors of functional outcome after right hemisphere stroke at 6-month follow up in patients with or without thrombolytic treatment. Thrombolysis did not predict functional outcome in instrumental activities of daily living (IADL). Lower acute phase basic activities of daily living (ADL) measured by th...
Article
Full-text available
Right hemisphere (RH) infarct patients have a tendency to begin visual scanning from the right side of a given stimulus. Our aim was to find out whether RH patients with (T+) or without (T-) thrombolytic treatment and healthy controls differ in their starting points in three cancellation tasks. Our sample comprised of 77 patients and 62 controls. T...
Article
Full-text available
Driving ability of three patients having a right hemisphere infarct and residual visual inattention was examined. The neuropsychological examination included the Peripheral Perception Test and the Signal Detection Test from the Vienna Test System, and the Behavioural Inattention Test (BIT). Driving ability was assessed with an on-road evaluation. T...
Article
This study examines the association between thrombolysis and visuoperceptual functions in right hemisphere (RH) infarct patients. Fifty-six consecutive patients with first acute RH infarct were matched for age, years of education and stroke severity at the time of admission to the emergency department (baseline NIHSS; National Institute of Health S...
Article
Full-text available
The aim of the study was to assess the association between thrombolysis and length of hospital stay after right hemisphere (RH) infarct, and to identify which cognitive functions were predictive of discharge. The study group consisted of 75 acute RH patients. Thirty-three patients had thrombolysis. Neuropsychological examinations were performed wit...
Article
Full-text available
This study examines the association between thrombolysis and visuoperceptual functions in right hemisphere (RH) infarct patients. Fifty-six consecutive patients with first acute RH infarct were matched for age, years of education and stroke severity at the time of admission to the emergency department (baseline NIHSS; National Institute of Health S...
Article
Full-text available
The association of visual neglect with survival after right hemisphere (RH) stroke has received only limited attention. This study explores the relationship of visual neglect and its spontaneous recovery to survival in a homogenous patient group with first-ever RH stroke. Fifty-one RH stroke patients who suffered an infarct between 1994 and 1997 we...
Article
Full-text available
Patients with visual neglect (VN) tend to start cancellation tasks from the right. This exceptional initial rightward bias is also seen in some right hemisphere (RH) stroke patients who do not meet the criteria of VN in conventional tests. The present study compared RH infarct patients' (examined on average 4 days post-stroke) and healthy controls'...
Article
Full-text available
Aims: To assess the impact of continuous positive airway pressure (CPAP) treatment on executive dysfunction in patients with obstructive sleep apnea syndrome (OSAS). Methods: At baseline, 20 OSAS patients and 17 healthy controls underwent polysomnography and neuropsychological assessment focusing on executive functions. After at least 6 months o...
Article
Full-text available
To clarify whether patients with obstructive sleep apnea syndrome (OSAS) have executive dysfunction, to identify the domains of executive function affected and to establish the severity of any dysfunction. A full-night polysomnography and a comprehensive neuropsychological assessment focusing on executive functions were conducted on 40 newly diagno...
Article
Full-text available
The aims of this study are to clarify whether patients with obstructive sleep apnea syndrome (OSAS) have a decline in verbally or visually-based cognitive abilities and whether the possible decline is related to particular sleep depth changes. In addition, the effect of continuous positive airway pressure (CPAP) on the possible changes is investiga...
Article
Full-text available
The aim of our study was to examine the memory functions of pistol sport shooters using powder charges when exposure to lead is expected to be considerably lower than in occupational circumstances. A neuropsychological battery of memory and intelligence tests was administered to 20 sport shooters and 20 controls whose mean ages (SDs) were 55 (9.6)...
Article
Objective: The aim of our study was to examine the memory functions of pistol sport shooters using powder charges when exposure to lead is expected to be considerably lower than in occupational circumstances. Methods: A neuropsychological battery of memory and intelligence tests was administered to 20 sport shooters and 20 controls whose mean ages...
Article
Objective – To provide an update on recent research on depression and anxiety in obstructive sleep apnea syndrome (OSAS). Methods – A review was carried out on reports drawn from MEDLINE and PSYCHLIT (January 1995–June 2006) and identified from their list of references. The selection criteria were met by 55 articles. Results – Sample sizes in the r...
Article
Full-text available
Spontaneous recovery and possible fluctuation in left visual neglect, and its relation to stroke severity, basic activities of daily living (ADL) and extended ADL were examined at 10 days, at 3, 6, and 12 months after onset. Twenty-one of 56 right hemisphere stroke patients had visual neglect. Three visual neglect recovery groups were identified: c...
Article
Full-text available
To provide an update on recent research concerning obstructive sleep apnea syndrome (OSAS) and executive functions. A systematic review was carried out on reports drawn from MEDLINE and PSYCHLIT (January 1990-December 2005) and identified from lists of references in these reports. The selection criteria were met by 40 articles. The sample sizes in...
Article
Full-text available
Neglect eli huomiotta jääminen on tarkkaavuuden häiriö, jossa vaurioon nähden vas-takkaisen kehonpuoliskon ja toimintatilan huomioiminen on puutteellista tai ei onnistu lainkaan. Sitä esiintyy yli 40 %:lla oikean aivopuoliskon verenkiertohäiriön jälkeen. Huomiotta jääminen heikentää potilaan työ-ja toimintakykyä ja on ehdoton este autolla ajamisell...
Article
This review provides an update on recent research findings concerning the methods used in the assessment of anosognosia, the occurrence and subtypes of anosognosia, the association between anosognosia and neglect, and the impact of anosognosias on functional outcome. A systematic review covering the period from 1995 to 2005 was carried out on repor...
Article
Full-text available
This study provides an update on recent research findings concerning neglect and its impact on functional outcome. The review covers studies published during the past ten years. A systematic review was carried out on reports drawn from electronic databases (MEDLINE and PSYCHLIT, January 1996 - August 2005) and identified from the lists of reference...
Article
Purpose: This study provides an update on recent research findings concerning neglect and its impact on functional outcome. The review covers studies published during the past ten years. Methods: A systematic review was carried out on reports drawn from electronic databases (MEDLINE and PSYCHLIT, January 1996–August 2005) and identified from the li...
Article
Full-text available
The aim of this study was to investigate whether it is possible to strengthen the rehabilitation of spatial hemineglect by combining standard training for spatial scanning with optokinetic stimulation. A simple randomized design was used: one group of neglect patients was treated with a combination of the two techniques, and a second group received...
Article
The aim was to study whether anosognosia for hemiparesis, anosognosia for neglect and general unawareness of illness double-dissociate, indicating that anosognosias are specific and independent impairments of awareness. On the other hand, anosognosias may be associated with one another and with general cognitive dysfunction, which decreases awarene...
Article
The aim of this study was to explore predictive factors of the length of hospital stay at the acute stage of right hemisphere stroke. Special attention was paid to the possible role of anosognosia for hemiparesis and anosognosia for neglect in this prediction. A consecutive series of 57 patients having their first right hemisphere stroke were exami...
Article
The aim was to study the role of visual neglect in acute right hemisphere brain infarct as a predictor of poor functional outcome during the first year after stroke. In particular, we were interested in the additional value of neglect measures besides hemiparesis, hemianopia, cognitive deficits and age. A consecutive series of 57 patients with a ne...
Article
The applications of a new segmentation software, Anatomatic, in the evaluation of volumetric measurements of brain infarctions and the new Medimag 3D software in the evaluation of 3D image representation of infarctions are described. These programs are applied to magnetic resonance imaging. The aim of this study is to evaluate the use of these soft...
Article
Oxidative stress is probably involved in neuronal damage induced by ischemia-reperfusion. The purpose of this study was to assess the role of antioxidant activity in cerebral ischemic stroke. Antioxidant activity of blood plasma and cerebrospinal fluid was assessed in 22 patients with cerebral hemisphere infarction that was verified and quantified...
Article
Transcranial magnetic stimulation (TMS) of the motor cortex produces motor evoked potentials (MEPs). Besides this excitatory response, TMS has inhibitory effects. When TMS is performed during voluntary muscle contraction, the MEP is followed by a pause in electromyographic activity (cortical silent period, SP). The aim of this study was to evaluate...
Article
The relationships between performance on a non-spatially-lateralized measure of sustained attention and spatial bias on tests sensitive to unilateral neglect were considered in a group of 44 patients with right hemisphere lesions following stroke. As predicted from earlier studies showing a strong association between unilateral spatial neglect and...

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Projects (4)
Project
This project aims at alleviating the weekly clinical challenge of differentiating early Alzheimer's disease from frontotemporal dementia and psychiatric etiologies in middle-aged patients. Neuropsychologist Andreas Johnen's group in Münster University has recently developed the Dementia Apraxia Test for the purpose of differentiating AD and FTD based on distinct apraxia profiles. The test has proved clinically promising but has not been cross-validated elsewhere. The primary goal of this project is to validate the test in a small Finnish sample and to see how the test functions in a psychiatric population. Clinical patient data collection will start in August 2019 and last for 3 years. Patients will be recruited at the Neurology and Psychiatry clinics of Lapland Central Hospital and in four primary health care units in Lapland. A group of healthy matched control individuals will be recruited as well. The responsible team includes npsl docent Mervi Jehkonen (Tampere University), clinical neurologist Riitta Ahmasalo (head of Neurology clinic), and speech-language pathologist Sari Tuuliainen.