Many clinical studies reported a compromised brain lateralization in patients with Attention-Deficit/Hyperactivity Disorder (ADHD) without being conclusive about whether the deficit existed in the left or right hemisphere. It is... more
Many clinical studies reported a compromised brain lateralization in patients with Attention-Deficit/Hyperactivity Disorder (ADHD) without being conclusive about whether the deficit existed in the left or right hemisphere. It is well-recognized that studying ADHD dimensionally is more controlled for comorbid problems and medication effects, and provides more accurate assessment of the symptoms. Therefore, the present study applied the dimensional approach to test the relationship between brain lateralization and self-reported ADHD symptoms in a population sample. Eighty-five right-handed university students filled in the Conners' Adult ADHD Rating Scales and performed a lateralization reaction time task. The task consists of two matching conditions: one condition requires nominal identification for letters tapping left hemisphere specialization (Letter Name-Identity condition) and the other one requires physical and visuospatial identification for shapes tapping right hemisphere...
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The present study applied the dimensional approach to test whether self-reported symptoms of Attention Deficit/Hyperactivity Disorder (ADHD) in adults are associated with the speed of interhemispheric interaction. A sample of first grade... more
The present study applied the dimensional approach to test whether self-reported symptoms of Attention Deficit/Hyperactivity Disorder (ADHD) in adults are associated with the speed of interhemispheric interaction. A sample of first grade students (N = 112) completed Conners' Adult ADHD Rating Scales and letter matching reaction time tasks. In the tasks, participants had to match a single target letter displayed below the fixation cross, either on left or right visual field, with one of two letters displayed above the fixation cross, one letter on each visual field. For each task, identical letters were presented either within the same visual field (within hemisphere condition) or across visual fields (across hemisphere condition). Interhemispheric interaction was indexed as the difference in mean reaction time between within and across hemisphere conditions. Comorbid problems such as depression, anxiety, and stress may affect task performance and are controlled for in this study...
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Background / Purpose: Reported variation in frequency of left-handedness between cultures ranges from 0.5 to 24%. We investigated hand skill and handedness in a nonindustrial population in the highlands of New Guinea where people still... more
Background / Purpose: Reported variation in frequency of left-handedness between cultures ranges from 0.5 to 24%. We investigated hand skill and handedness in a nonindustrial population in the highlands of New Guinea where people still live a traditional life reflecting conditions in which handedness may have evolved. Main conclusion: No age effects on lateralizationExpected developmental effects on performance
This article presents a review of the studies that have analysed the motor skills of ADHD children without medication and the influence of medication on their motor skills. The following two questions guided the study: What is the... more
This article presents a review of the studies that have analysed the motor skills of ADHD children without medication and the influence of medication on their motor skills. The following two questions guided the study: What is the evidence of impairment of motor skills and aspects of motor control among children with ADHD aged between 6 and 16 years? What are the effects of ADHD medication on motor skills and motor control? The following keywords were introduced in the main databases: attention disorder and/or ADHD, motor skills and/or handwriting, children, medication. Of the 45 articles retrieved, 30 described motor skills of children with ADHD and 15 articles analysed the influence of ADHD medication on motor skills and motor control. More than half of the children with ADHD have difficulties with gross and fine motor skills. The children with ADHD inattentive subtype seem to present more impairment of fine motor skills, slow reaction time, and online motor control during complex...
Research Interests: Psychology, Pediatrics, ADHD (Psychology), Child and adolescent mental health, Comorbidity, and 8 moreDevelopmental Coordination Disorder, DCD, Developmental disabilities, Systematic review, Public health systems and services research, Child and Adolescent Mental Health, Psychomotor Disorders, and Motor Skills
Rhythmic interlimb coordination arises from the interaction of intrinsic dynamics and behavioral information, that is, intention, memory, or external information specifying the required coordination pattern. This study investigates the... more
Rhythmic interlimb coordination arises from the interaction of intrinsic dynamics and behavioral information, that is, intention, memory, or external information specifying the required coordination pattern. This study investigates the influence of the content of memorized behavioral information on coordination in musically experienced and inexperienced participants. These groups are hypothesized to have different intrinsic dynamics for this task. Stability was assessed in a switching task (variability and switching time). The in-phase, anti-phase, and 90 degrees -phase difference were specified in a neutral and an ecologically relevant manner. Musicians showed more stable coordination than nonmusicians did. No interaction effect was found with memorized behavioral information. Behavioral information showed an interaction effect with phase pattern on coordination variability, with the strongest effect for the 90 degrees -phase pattern. Switching time was affected largely in line wit...
Research Interests: Music, Motor Control, Memory, Humans, Female, and 5 moreMale, Periodicity, Adult, Hand, and Motor Skills
The functional significance of event-related desynchronization (ERD) of alpha rhythm was investigated in a task which manipulated cognitive load and event rate. It was found that with increasing cognitive load the amount and duration of... more
The functional significance of event-related desynchronization (ERD) of alpha rhythm was investigated in a task which manipulated cognitive load and event rate. It was found that with increasing cognitive load the amount and duration of ERD increased. When a slow event rate was used the mean relative desynchronization of alpha rhythm and duration of ERD increased. These effects were found to be independent of one another. These results were interpreted as indicating that the mean ERD of alpha rhythm is sensitive to the selective attention demands of a task and the surprise value of stimuli.
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Research Interests: Electroencephalography, Brain, Evoked Potentials, Humans, Female, and 5 moreMale, Reaction Time, Arousal, Adult, and Alpha Rhythm
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ABSTRACT Het vakgebied van de klinische neuropsychologie is relatief jong en vooral de klinische kinderneuropsychologie moet deels nog tot wasdom komen. Veel kinderneuropsychologische diagnostiek is gekopieerd van, of ontleend aan, de... more
ABSTRACT Het vakgebied van de klinische neuropsychologie is relatief jong en vooral de klinische kinderneuropsychologie moet deels nog tot wasdom komen. Veel kinderneuropsychologische diagnostiek is gekopieerd van, of ontleend aan, de volwassen klinisch neuropsychologische diagnostiek. Er is een landelijke specialistische postdoctorale opleiding in de klinische neuropsychologiehttps://nestor.rug.nl/@@/68C81D8CC4E3098989446F7450B859FC/courses/1/PSM-T/content/_599146_1/rino%20folder%20Klinisch%20Neuropsycholoog.pdf1 die nog pas enkele jaren bestaat en waarbinnen ook enige ruimte is voor kinderneuropsychologie, maar er is geen eigen kinderneuropsychologie-opleiding en -leerboek. Engelstalige uitgaven zoals het Handbook of Clinical Child Neuropsychology van Reynolds & Fletcher-Janzen (red.) (3rd edition, 2009; erg Amerikaans en niet ingedeeld naar neuropsychologisch functiedomein) of Neuropsychological Evaluation of the Child van I.S. Baron (2003) zijn er wel, maar een uitgave die aansluit bij de N ...
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Research Interests: Psychology, Neuropsychology, Nonparametric Statistics, Language, Fetal development, and 15 morePregnancy, Humans, Child, Corpus Callosum, Testosterone, Female, Male, Amniotic Fluid, Dichotic Listening, Pregnant Women, Left Hemisphere, Reference Values, Neurosciences, Radioimmunoassay, and Functional Laterality
Research Interests: Psychology, Neuropsychology, Intelligence, Visual perception, Attention, and 16 moreCerebral Palsy, Humans, Child, Reaction Time, Developmental disabilities, Longitudinal Studies, Longitudinal Study, Dorsal Stream, Longitudinal data, Retrospective Studies, Age Factors, Typical Development, Cross Sectional Studies, Neurosciences, Premature Birth, and Case Control Studies
ABSTRACT Reports an error in "Difference rather than delay in development of elementary visuomotor processes in children born preterm without cerebral palsy: A quasi-longitudinal study" by Koenraad Van Braeckel, Phillipa... more
ABSTRACT Reports an error in "Difference rather than delay in development of elementary visuomotor processes in children born preterm without cerebral palsy: A quasi-longitudinal study" by Koenraad Van Braeckel, Phillipa R. Butcher, Reint H. Geuze, Maritje A. J. van Dujin, A. F. Bos and Anke Bourma (Neuropsychology, 2010[Jan], Vol 24[1], 90-100). In the current article the names of authors Marijtje A. J. van Duijn and Anke Bouma were misspelled as Maritje A. J. van Dujin and Anke Bourma, respectively. The online versions of this article have been corrected. (The following abstract of the original article appeared in record 2010-00119-012.) Follow-up studies of preterm children without serious neonatal medical complications have consistently found poor visuomotor and visuospatial skills. In the first round of current follow-up study, we found a deficit in elementary visuomotor processes in preterm children without Cerebral Palsy (CP). To determine whether the development of these processes was delayed or different, we carried out a quasi-longitudinal study in which kinematic characteristics of pointing movements in 7- to 11-year-old preterm born children without CP and in an age-matched full-term group were analyzed. Multi-level analysis suggested a difference rather than a delay in the preterm born group: we found a regression around 8 years of age in the control but not in the preterm group. To our knowledge, this study is the first to provide longitudinal data confirming this regression in the development of movement control in typically developing children. Our results are also consistent in suggesting that elementary visuomotor processes are less efficient in preterm born children without CP: their movements were either slower or less accurate. While these differences were subtle, they persisted until 11 years of age. (PsycINFO Database Record (c) 2010 APA, all rights reserved).
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Research Interests: Psychology, Cognitive Science, Language, Language Processing, Pregnancy, and 18 moreHumans, Child, Corpus Callosum, Testosterone, Sex Difference, Female, Male, Information Transfer, Reaction Time, Amniotic Fluid, Dichotic Listening, Division of Labour, Neuropsychologia, Left Hemisphere, Neurosciences, Radioimmunoassay, Audiometry, and Functional Laterality
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A dynamic pattern approach is used to examine the relative phase stability of rhythmic coordination in 24 children with a Developmental Coordination Disorder (DCD) and 24 matched controls in two functionally different tasks – a... more
A dynamic pattern approach is used to examine the relative phase stability of rhythmic coordination in 24 children with a Developmental Coordination Disorder (DCD) and 24 matched controls in two functionally different tasks – a within-subject task (bimanual coordination) and a subject-environment task (visuomanual coordination). The stability of basic rhythmic coordination patterns (in-phase and antiphase patterns) was tested by applying
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Multifrequency coordination studies have shown the importance of hand-role in addition to hand-preference in bimanual rhythmic coordination. In these studies, hand-role has been defined by the task of the individual hands (moving fast or... more
Multifrequency coordination studies have shown the importance of hand-role in addition to hand-preference in bimanual rhythmic coordination. In these studies, hand-role has been defined by the task of the individual hands (moving fast or slow). In the present study, the hands were coordinated at the same frequency and hand-role was defined by the asymmetry of the coordination pattern. Eleven consistent left-handers and 13 consistent right-handers tapped three patterns (anti-phase, left-gallop, right-gallop) in four visual feedback conditions (no feedback, left-hand feedback, right-hand feedback, full feedback). The analysis focused on phase shifts, phase variability, intertap interval variability, and correlations between intertap intervals. The manipulation of visual feedback had only minor effects. In the anti-phase pattern, a symmetric coupling mechanism was found. The results support the idea that coordination in the gallop pattern is governed by a hierarchical control mechanism. In contrast to the multifrequency studies, however, successful control in the gallop is not dependent on a hand arrangement that accommodates the preferred hand as the leading hand. An adjustment to the model of Summers et al. (1993, J Exp Psychol Hum Percept Perform 19:416-428) is presented for the case of the gallop pattern.