Jarrad A. G. Lum

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Recent studies show that children with developmental coordination disorder (DCD) have difficulties in generating an accurate visuospatial representation of an intended action, which are shown by deficits in motor imagery. This study sought to test this hypothesis further using a mental rotation paradigm. It was predicted that children with DCD would not(More)
According to the Procedural Deficit Hypothesis (PDH), abnormalities of brain structures underlying procedural memory largely explain the language deficits in children with specific language impairment (SLI). These abnormalities are posited to result in core deficits of procedural memory, which in turn explain the grammar problems in the disorder. The(More)
This study tests accounts of co-reference errors whereby children allow ‘‘Mama Bear’’ and ‘‘her’’ to co-refer in sentences like ‘‘Mama Bear is washing her’’ (Chien and Wexler 1990). 63 children aged 4;6, 5;6 and 6;6 participated in a truth-value judgment task augmented with a sentence production component. There were three major finding: 1) contrary to(More)
BACKGROUND Much evidence has accumulated to indicate memory deficits in children with specific language impairment. However, most research has focused on working memory impairments in these children. Less is known about the functioning of other memory systems in this population. AIMS This study examined procedural and declarative memory in young children(More)
OBJECTIVE This article reports findings of a meta-analysis and meta-regression summarizing research on implicit sequence learning in individuals with Parkinson's disease (PD), as measured by the Serial Reaction Time (SRT) task. METHOD Following a systematic search of the literature, we analyzed a total of 27 studies, representing data from 505(More)
UNLABELLED It has been proposed that the language problems in specific language impairment (SLI) arise from basal ganglia abnormalities that lead to impairments with procedural and working memory but not declarative memory. In SLI, this profile of memory functioning has been hypothesized to underlie grammatical impairment but leave lexical knowledge(More)
A number of studies have investigated procedural learning in dyslexia using serial reaction time (SRT) tasks. Overall, the results have been mixed, with evidence of both impaired and intact learning reported. We undertook a systematic search of studies that examined procedural learning using SRT tasks, and synthesized the data using meta-analysis. A total(More)
Rapid processing deficits have been the subject of much debate in the literature on specific language impairment (SLI). Hari and Renvall (2001) [Hari, R. & Renvall, H. (2001). Impaired processing of rapid stimulus sequences in dyslexia. Trends in cognitive sciences, 5, 525-532.] proposed that the source of this deficit can be attributed to sluggish(More)
BACKGROUND Pre-school language impairment is common and greatly reduces educational performance. Population attempts to identify children who would benefit from appropriately timed intervention might be improved by greater knowledge about the typical profiles of language development. Specifically, this could be used to help with the early identification of(More)
This systematic review and meta-analysis was conducted across studies using transcranial magnetic stimulation to investigate corticospinal excitability and inhibition in response to a dual task (DT). Quantitative analysis was performed on eleven controlled studies that had included healthy participants over the age of 18 years. Results showed a small effect(More)