A new method to evaluate order and accuracy of inaccurately and incompletely reproduced movement sequences

Drever, Johannes; Straube, Andreas; Eggert, Thomas

doi:10.3758/s13428-010-0025-0

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…In addition, omissions and erroneous pointing movements which do not correspond to any remembered target position may occur (explorations). Therefore, in this paradigm, the reproductions cannot simply be assigned to the targets with the smallest spatial distance, but were submitted to an algorithm which was developed to assign pointing positions to target locations under these specific conditions [19]. Basically, the algorithm performs a recursive ordered assignment [31,32] searching for the longest continuous target sub-sequence that can be assigned in order and under consideration of potential intermittent, explorative reproductions which were not assigned to any target.…”

Section: Discussionmentioning

confidence: 99%

“…The DILSS-task [19][20][21] was performed in trials consisting of a presentation-phase during which the subject only observed the target on the screen, followed by a reproduction-phase during which the subject pointed with the graphic pen to the memorized target locations on the blank screen. A full training session consisted of 25 repetitions of these presentation-reproduction pairs.…”

Section: Dilss-taskmentioning

confidence: 99%

“…A sequential visuospatial memory is needed, for example, in landmark-based navigation, when a long sequence of visual cues is used to reconstruct a spatial path without representing its entire shape. Because of the apparent lack of sequential tasks on visuospatial memory, we developed in previous studies [19][20][21] a test for deferred imitation of long spatial sequences (DILSS) by either manual or ocular pointing movements. In this task, subjects acquire a very long sequence of target positions in a repeated succession of presentation and reproduction.…”

Section: Introductionmentioning

confidence: 99%

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A new test to detect impairments of sequential visuospatial memory due to lesions of the temporal lobe

et al. 2022

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This study investigates visuospatial memory in patients with unilateral lesions of the temporal lobe and the hippocampus resulting from surgery to treat drug-resistant epilepsy. To detect impairments of visuospatial memory in these individuals, a memory test should be specific to episodic memory, the type of memory in which the hippocampus is crucially involved. However, most known visuospatial memory tests do not focus on episodic memory. We hypothesized that a new sequential visuospatial memory test, which has been previously developed and applied only in healthy subjects, might be suitable to fill this gap. The test requires the subject to reproduce a memorized sequence of target locations in ordered recall by typing on a blank graphics tablet. The length of the memorized sequence extended successively after repeated presentation of a sequence of 20 target positions. The test was done twice on day one and again after one week. Visual working memory was tested with the Corsi block-tapping task. The performance in the new test was also related to the performance of the patients in the standard test battery of the neuropsychological examination in the clinical context. Thirteen patients and 14 controls participated. Patients showed reduced learning speed in the new sequential visuospatial memory task. Right-sided lesions induced stronger impairments than left-sided lesions. After one week, retention was reduced in the patients with left-sided lesions. The performance of the patients in commonly used tests of the neuropsychological standard battery did not differ compared to healthy subjects, whereas the new test allowed discrimination between patients and controls at a high correct-decision rate of 0.89. The Corsi block-span of the patients was slightly shorter than that of the controls. The results suggest that the new test provides a specific investigation of episodic visuospatial memory. Hemispheric asymmetries were consistent with the general hypothesis of right hemispheric dominance in visuospatial processing.

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Section: Discussionmentioning

confidence: 99%

Section: Dilss-taskmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new test to detect impairments of sequential visuospatial memory due to lesions of the temporal lobe

et al. 2022

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Deficits of cortical oculomotor mechanisms in cerebellar atrophy patients

2012

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Commonly, the cerebellum is not associated with cortical components of saccadic eye movement programming. The present study investigates cerebellar effects on visually guided saccades in reflexive tasks (step, gap, overlap) and on internally driven saccades in intentional tasks (anti, memory, short memory sequences of four targets) in five patients with isolated cerebellar atrophy. The cerebellar dysfunction led to impairments in both reflexive and intentional saccades. Cerebellar atrophy patients showed an increase in the gain variability and an increase in the saccade latency. Furthermore, in the memory and anti task, suppression and pro-saccade errors were more frequent in the atrophy group compared to the control group. In the sequence task, patients had difficulties reproducing all four target locations in the order of the displayed sequence. The high variability of the saccade gain is a common observation in cerebellar atrophy patients and can be explained by the general variability present in the saccadic system. The increase in the saccade latency could be due to a cerebellar contribution to cortical processes related to fixation and target selection preceding the initiation of a saccade. Furthermore, the frequent occurrence of saccade errors in the memory and anti task suggests a cerebellar involvement in frontal inhibition of unwanted reflexive saccades. The impaired reproduction of saccade sequences in atrophy patients points to a deficit in short-term memory processes. Thus, this study provides further evidence that the cerebellum is involved in different cortical mechanisms related to the control of saccadic eye movements.

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Effects of cerebellar infarcts on cortical processing of saccades

2012

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The objective of the present study was to investigate cerebellar influences on cortical components of saccadic eye movement programming in human subjects. In 24 patients with a localized cerebellar lesion, saccadic eye movements were recorded in different reflexive (step, gap, overlap) and intentional (anti, memory, short memory sequences) tasks and compared to 23 healthy controls. The cerebellar lesions led to impairments in different saccade parameters. Cerebellar patients tended to show hypermetria and increased latencies compared to the control group. In particular, they executed significantly more erroneous saccades specifically in the memory task (suppression errors) but not in the anti task (pro-saccade errors). Moreover, while reproducing short sequences of saccades from memory, patients with cerebellar infarcts made more errors with regard to the sequence order than controls. The influence of cerebellar hemispheric lesions on the saccade latency, the task-specific lesion effects on the frequency of suppression errors, and the effects on the number of order errors suggest that the cerebellum is involved in cortical processes such as target selection and sequence reproduction.

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A new method to evaluate order and accuracy of inaccurately and incompletely reproduced movement sequences

Cited by 4 publications

References 18 publications

A new test to detect impairments of sequential visuospatial memory due to lesions of the temporal lobe

A new test to detect impairments of sequential visuospatial memory due to lesions of the temporal lobe

Deficits of cortical oculomotor mechanisms in cerebellar atrophy patients

Effects of cerebellar infarcts on cortical processing of saccades

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