Nonverbal memory functioning following right anterior temporal lobectomy: a meta-analytic review

Vaz, Stephanie A. McDermid

doi:10.1016/j.seizure.2003.12.004

Cited by 78 publications

(45 citation statements)

References 43 publications

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“…The findings of the current study also underscore that there is still the need to find a more precise neuropsychological marker of right hippocampal integrity [53][54][55][56].…”

Section: Discussionsupporting

confidence: 54%

Relevance of hippocampal integrity for memory outcome after surgical treatment of mesial temporal lobe epilepsy

et al. 2015

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Surgical treatment of unilateral mesial temporal lobe epilepsy (mTLE) particularly bears the risk of episodic memory decline. The present study investigates the role of the ipsilateral hippocampal integrity for postoperative change in material-specific memory performance. In 104 patients who had undergone epilepsy surgery for unilateral mTLE, we analyzed pre- to postoperative changes of verbal and figural memory as a function of segmental neuronal cell densities of the resected hippocampus (cornu ammonis, CA1-4; internal and external limb of the dentate gyrus, DG). Results were controlled for side of surgery and hemispheric dominance. Surgery caused significant memory decline, especially with regard to verbal memory after left temporal resections. Seizure freedom (65 % Engel Ia) did not affect memory outcome. Higher neuronal cell densities of the resected left hippocampus were associated with greater declines in verbal memory parameters (r = -0.27 to r = -0.39, p < 0.05), especially when excluding patients with atypical hemispheric dominance (r = -0.34 to r = -0.60, p < 0.05; significant correlations across all hippocampal subfields). There were no systematic correlations between neuronal cell densities of the resected right hippocampus and memory changes. The results emphasize the role of the structural and functional integrity of the hippocampus within the left dominant hemisphere for the degree of verbal memory decline after temporal lobe surgery. Presurgical verbal memory performance may be taken as a marker of ipsilateral left hippocampal integrity and may contribute to individual risk-benefit evaluations before epilepsy surgery. Finally, more precise neuropsychological markers of right hippocampal integrity are needed.

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“…The findings of the current study also underscore that there is still the need to find a more precise neuropsychological marker of right hippocampal integrity [53][54][55][56].…”

Section: Discussionsupporting

confidence: 54%

Relevance of hippocampal integrity for memory outcome after surgical treatment of mesial temporal lobe epilepsy

et al. 2015

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“…However, contrary to our expectations, abstract shapes were not associated with a significant right lateralization of this component. Previous clinical studies have also demonstrated that left-lateralization of memory for verbal material is more easily observed than the right-lateralization of memory for non-verbal stimuli (Boucher et al, 2015; Lee et al, 2002; Vaz, 2004; Vingerhoets et al, 2006). Nevertheless, a study using functional near-infrared spectroscopy during a recognition task with abstract shapes has recently reported a right-lateralization of the repetition effect over the right ventrolateral prefrontal cortex (Sanefuji et al, 2007).…”

Section: Discussionmentioning

confidence: 91%

An ERP study of recognition memory for concrete and abstract pictures in school-aged children

Boucher

Chouinard-Leclaire

Muckle

et al. 2016

International Journal of Psychophysiology

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Recognition memory for concrete, nameable pictures is typically faster and more accurate than for abstract pictures. A dual-coding account for these findings suggests that concrete pictures are processed into verbal and image codes, whereas abstract pictures are encoded in image codes only. Recognition memory relies on two successive and distinct processes, namely familiarity and recollection. Whether these two processes are similarly or differently affected by stimulus concreteness remains unknown. This study examined the effect of picture concreteness on visual recognition memory processes using event-related potentials (ERPs). In a sample of children involved in a longitudinal study, participants (N = 96; mean age = 11.3 years) were assessed on a continuous visual recognition memory task in which half the pictures were easily nameable, everyday concrete objects, and the other half were three-dimensional abstract, sculpture-like objects. Behavioral performance and ERP correlates of familiarity and recollection (respectively, the FN400 and P600 repetition effects) were measured. Behavioral results indicated faster and more accurate identification of concrete pictures as “new” or “old” (i.e., previously displayed) compared to abstract pictures. ERPs were characterised by a larger repetition effect, on the P600 amplitude, for concrete than for abstract images, suggesting a graded recollection process dependant on the type of material to be recollected. Topographic differences were observed within the FN400 latency interval, especially over anterior-inferior electrodes, with the repetition effect more pronounced and localized over the left hemisphere for concrete stimuli, potentially reflecting different neural processes underlying early processing of verbal/semantic and visual material in memory.

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“…A major reason for this approach is that systematic effects of surgery are mostly found only for verbal memory after left temporal lobe surgery. 42,44,48 However, left and right mesial structures appear to provide highly redundant and compensatory functions in verbal memory processing. 17 Accordingly, it can be observed that nonverbal memory may be sacrificed in favor of verbal memory 20 and that material-specific impairments in TLE are less likely in the presence of generally reduced mental capacities.…”

Section: Discussionmentioning

confidence: 99%

Neuropsychological outcome after epilepsy surgery in patients with bilateral Ammon's horn sclerosis

Vogt¹,

Malter²,

Schoene-Bake³

et al. 2014

JNS

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Object. The purpose of this study was to retrospectively assess the objective and subjective neuropsychological outcome after epilepsy surgery in patients with bilateral Ammon's horn sclerosis (AHS).Methods. Memory and executive functions were evaluated at baseline and at follow-up in 11 surgically treated patients and compared with 8 pharmacologically treated patients with temporal lobe epilepsy and bilateral AHS. The median follow-up duration was 16 months in the surgically treated patients and 80.5 months in the pharmacologically treated group. Subjective outcome was evaluated by questionnaires and included mood, quality of life, subjective memory, and activities of daily living.Results. At the follow-up assessment, 82% of the surgically treated patients as opposed to 0% of the nonsurgery patients were seizure free. In the surgical group, nonverbal memory performance did not change significantly in any patient after surgery, but there was a floor effect in 55% of the surgical patients. Regarding verbal memory, 9% of the surgical patients improved while 73% declined, despite severe impairments already evident at baseline. In the nonsurgery control group, 13% of the patients declined in nonverbal memory (floor effect in 63%) and 25% declined in verbal memory (floor effect in 25%) at follow-up. None of the controls improved at follow-up. Executive functions remained unchanged on an impaired level in both groups. At follow-up, the patient groups did not differ significantly with respect to mood, quality of life, subjective memory, or activities of daily living. However, in most aspects, surgically treated patients reported a slightly better subjective outcome than pharmacologically treated patients and a significantly improved quality of life.Conclusions. These results suggest that beyond benefits concerning seizure control, surgically treated patients with bilateral AHS, despite already poor baseline performance, are still at risk for severe postoperative decline in memory. In the light of predominantly minor benefits on a subjective level, the findings put the overall outcome of epilepsy surgery in bilateral AHS patients into perspective. (http://thejns.org/doi/abs/10.3171/2014.7.JNS132037) key WordS • neuropsychological outcome • temporal lobe epilepsy surgery • memory • bilateral Ammon's horn sclerosis Abbreviations used in this paper: AHS = Ammon's horn sclerosis; BDI = Beck Depression Inventory; QOLIE = Quality of Life in Epilepsy Inventory; RCI = reliable change index; TLE = temporal lobe epilepsy; VLMT = Verbaler Lern-und Merkfähigkeitstest.

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Nonverbal memory functioning following right anterior temporal lobectomy: a meta-analytic review

Abstract: Overall, the collective findings demonstrate the inability of the current research to provide any consistent evidence as to the nature of nonverbal memory outcome following RATL. Problems with nonverbal memory measures are discussed and suggestions for future research are proposed.

Cited by 78 publications

References 43 publications

Relevance of hippocampal integrity for memory outcome after surgical treatment of mesial temporal lobe epilepsy

Relevance of hippocampal integrity for memory outcome after surgical treatment of mesial temporal lobe epilepsy

An ERP study of recognition memory for concrete and abstract pictures in school-aged children

Neuropsychological outcome after epilepsy surgery in patients with bilateral Ammon's horn sclerosis

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