scholarly journals Anterior temporal lobe morphometry predicts categorization ability

2017 ◽  
Author(s):  
B. Garcin ◽  
M. Urbanski ◽  
M. Thiebaut De Schotten ◽  
R. Levy ◽  
E. Volle
Keyword(s):  
White Matter ◽  
Temporal Lobe ◽  
Temporal Region ◽  
List Type ◽  
Semantic Matching ◽  
Anterior Temporal Lobe ◽  
Anterior Portion ◽  
Semantic Categorization ◽  
The Right ◽  
Shape Categorization

AbstractCategorization is the mental operation by which the brain classifies objects and events. It is classically assessed using semantic and non-semantic matching or sorting tasks. These tasks show a high variability in performance across healthy controls and the cerebral bases supporting this variability remain unknown. In this study we performed a voxel-based morphometry study to explore the relationships between semantic and shape categorization tasks and brain morphometric differences in 50 controls. We found significant correlation between categorization performance and the volume of the grey matter in the right anterior middle and inferior temporal gyri. Semantic categorization tasks were associated with more rostral temporal regions than shape categorization tasks. A significant relationship was also shown between white matter volume in the right temporal lobe and performance in the semantic tasks. Tractography revealed that this white matter region involved several projection and association fibers, including the arcuate fasciculus, inferior fronto-occipital fasciculus, uncinate fasciculus, and inferior longitudinal fasciculus. These results suggest that categorization abilities are supported by the anterior portion of the right temporal lobe and its interaction with other areas.HighlightsAnterior temporal lobe morphometry correlates with categorization performancesSemantic is associated with a more rostral temporal region than shape categorizationSemantic categorization performances are associated with right temporal connections

scholarly journals Diffusion tensor imaging correlates of hippocampal sclerosis and anterior temporal lobe T2 signal changes in pharmacoresistant epilepsy

2014 ◽  
Vol 01 (01) ◽  
pp. 001-007 ◽  
Author(s):  
Kevin Spitler ◽  
Francis Tirol ◽  
Itzhak Fried ◽  
Jerome Engel ◽  
Noriko Salamon
Keyword(s):  
Diffusion Tensor Imaging ◽  
White Matter ◽  
Temporal Lobe ◽  
Diffusion Tensor ◽  
Hippocampal Sclerosis ◽  
Anterior Temporal Lobe ◽  
Pharmacoresistant Epilepsy ◽  
Fiber Tracts ◽  
White Matter Fiber Tracts ◽  
The Right

AbstractBackground and purpose Our goal was to determine fiber tract integrity in hippocampal sclerosis (HS) using diffusion tensor imaging (DTI) and to correlate white matter damage with other pathology in this disease.Methods Twenty-six patients and eight controls were studied with DTI tractography for 8 pairs of white matter fiber tracts and 2 commissural tracts. Fractional anisotropy (FA) of the fiber tracts was compared with controls. The FA of select fiber tracts was also compared with change in T2 signal in the anterior temporal lobe (ATC), and the performance on neuropsychological tests.Results In comparison with controls, subjects with left sided hippocampal sclerosis (L-HS) had 3 ipsilateral fiber tracts with decreased FA. The FA of fiber tracts was similar in right sided HS (R-HS) to controls. The ipsilateral inferior longitudinal fasciculus had a decrease in FA that correlated with the ATC (T2 signal change). The right superior longitudinal fasciculus had a decrease in FA proportional to lower performance on tests of memory and language.Conclusion The subjects with L-HS had more extensive structural abnormalities involving white matter tracts, both ipsilateral and contralateral. In contrast, subjects with R-HS had limited changes in white matter integrity. Pathology of white matter appears to be involved in deficits associated with HS, including ATC and cognitive performance.

PATH61 Structural plasticity of white matter networks following anterior temporal lobe resection

2010 ◽  
Vol 81 (11) ◽  
pp. e24-e24
Author(s):  
M. Yogarajah ◽  
A. McEvoy ◽  
N. Focke ◽  
J. Duncan ◽  
M. Koepp ◽  
...  
Keyword(s):  
White Matter ◽  
Temporal Lobe ◽  
Structural Plasticity ◽  
Anterior Temporal Lobe ◽  
Temporal Lobe Resection

scholarly journals A Role for the Right Anterior Temporal Lobe in Taste Quality Recognition

1997 ◽  
Vol 17 (13) ◽  
pp. 5136-5142 ◽  
Author(s):  
Dana M. Small ◽  
Marilyn Jones-Gotman ◽  
Robert J. Zatorre ◽  
Michael Petrides ◽  
Alan C. Evans
Keyword(s):  
Temporal Lobe ◽  
Taste Quality ◽  
Anterior Temporal Lobe ◽  
The Right

Anatomy of the Anterior Temporal Lobe and the Frontotemporal Region Demonstrated by Fiber Dissection

Neurosurgery ◽  
2004 ◽  
Vol 55 (5) ◽  
pp. 1174-1184 ◽  
Author(s):  
Diedrik Peuskens ◽  
Johannes van Loon ◽  
Frank Van Calenbergh ◽  
Raymond van den Bergh ◽  
Jan Goffin ◽  
...  
Keyword(s):  
White Matter ◽  
Temporal Lobe ◽  
Anterior Commissure ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Surgical Approaches ◽  
Anterior Temporal Lobe ◽  
White Matter Tracts ◽  
Fiber Dissection ◽  
Dissection Technique

Abstract OBJECTIVE: The white matter structure of the anterior temporal lobe and the frontotemporal region is complex and not well appreciated from the available neurosurgical literature. The fiber dissection method is an excellent means of attaining a thorough knowledge of the three-dimensional structure of the white matter tracts. This study was performed to demonstrate the usefulness of the dissection technique in understanding the white matter anatomy and the effects of current surgical approaches on the subcortical structure of the region. METHODS: Seventeen brain specimens obtained at routine autopsy were dissected by use of Klingler's fiber dissection technique after preparation by fixation and freezing. The dissections were performed with an operating microscope and followed a stepwise pattern of progressive white matter dissection. RESULTS: The dissection is described in an orderly fashion showing the white matter tracts of the anterior temporal lobe and the frontotemporal region. An insight is gained into the three-dimensional course of the anterior loop of the optic radiation, the temporal stem, the anterior commissure, and the ansa peduncularis. CONCLUSION: The anterior temporal lobe and the frontotemporal region contain several important white matter tracts that can be uniquely understood by performing a white matter dissection of the region. Surgical procedures on the anterior temporal lobe differ substantially as to their repercussions on the subcortical white matter tract anatomy, as shown by the findings in this study.

scholarly journals Neural Pattern Change During Encoding of a Narrative Predicts Retrospective Duration Estimates

2016 ◽  
Author(s):  
Olga Lositsky ◽  
Janice Chen ◽  
Daniel Toker ◽  
Christopher J Honey ◽  
Jordan L Poppenk ◽  
...  
Keyword(s):  
Prefrontal Cortex ◽  
Entorhinal Cortex ◽  
Temporal Lobe ◽  
Medial Temporal Lobes ◽  
Anterior Temporal Lobe ◽  
Temporal Lobes ◽  
Contextual Features ◽  
Pattern Change ◽  
Behavioral Studies ◽  
The Right

What mechanisms support our ability to estimate durations on the order of minutes? Behavioral studies in humans have shown that changes in contextual features lead to overestimation of past durations. Based on evidence that the medial temporal lobes and prefrontal cortex represent contextual features, we related the degree of fMRI pattern change in these regions with people's subsequent duration estimates. After listening to a radio story in the scanner, participants were asked how much time had elapsed between pairs of clips from the story. Our ROI analysis found that the neural pattern distance between two clips at encoding was correlated with duration estimates in the right entorhinal cortex and right pars orbitalis. Moreover, a whole-brain searchlight analysis revealed a cluster spanning the right anterior temporal lobe. Our findings provide convergent support for the hypothesis that retrospective time judgments are driven by 'drift' in contextual representations supported by these regions.

scholarly journals Maturational trajectories of white matter microstructure underlying the right presupplementary motor area reflect individual improvements in motor response cancellation in children and adolescents

2020 ◽  
Author(s):  
Kathrine Skak Madsen ◽  
Louise Baruël Johansen ◽  
Wesley K. Thompson ◽  
Hartwig R. Siebner ◽  
Terry L. Jernigan ◽  
...  
Keyword(s):  
White Matter ◽  
Children And Adolescents ◽  
Fractional Anisotropy ◽  
Motor Response ◽  
Stop Signal ◽  
Motor Area ◽  
Stop Signal Task ◽  
List Type ◽  
White Matter Microstructure ◽  
The Right

AbstractThe ability to effectively suppress motor response tendencies is essential for focused and goal-directed behavior. Here, we tested the hypothesis that developmental improvement in the ability to cancel a motor response is reflected by maturational changes in the white matter underlying the right presupplementary motor area (preSMA) and posterior inferior frontal gyrus (IFG), two cortical key areas of the fronto-basal ganglia “stopping” network. Eighty-eight typically-developing children and adolescents, aged 7-19 years, were longitudinally assessed with the stop-signal task (SST) and diffusion tensor imaging (DTI) of the brain over a period of six years. Participants were examined from two to nine times with an average of 6.6 times, resulting in 576 SST-DTI datasets. We applied tract-based spatial statistics to extract mean fractional anisotropy (FA) from regions-of-interest in the white matter underlying the right IFG (IFGFA) and right preSMA (preSMAFA) at each time point. Motor response cancelation performance, estimated with the stop-signal reaction time (SSRT), improved with age. Initially well performing children plateaued around the age of 11 years, while initially poor performers caught up at the age of 13-14 years. White matter microstructure continued to mature across the investigated age range. Males generally displayed linear maturational trajectories, while females displayed more curvilinear trajectories that leveled off around 12-14 years of age. Maturational increases in right preSMAFA but not right IFGFA were associated with developmental improvements in SSRT. This association differed depending on the mean right preSMAFA across the individual maturational trajectory. Children with lower mean right preSMAFA exhibited poorer SSRT performance at younger ages but steeper developmental trajectories of SSRT improvement. Children with higher mean right preSMAFA exhibited flatter trajectories of SSRT improvement along with faster SSRT already at the first assessments. The results suggest that no further improvement in motor response cancellation is achieved once a certain level of maturity in the white matter underlying the right preSMA is reached. Similar dynamics may apply to other behavioral read-outs and brain structures and, thus, need to be considered in longitudinal MRI studies designed to map brain structural correlates of behavioral changes during development.HighlightsMotor response cancellation, i.e. SSRT, improvement plateaued at 13-14 years of ageFractional anisotropy (FA) captured maturation of white matter (WM) microstructureFA in the WM underlying right preSMA (preSMAFA) reflected SSRT improvement with ageIndividual SSRT improvement depended on mean right preSMAFA across all DTI sessionsChildren with lower mean right preSMAFA had the steepest improvements in SSRT

scholarly journals TDCS to the right anterior temporal lobe facilitates insight problem-solving

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Carola Salvi ◽  
Mark Beeman ◽  
Marom Bikson ◽  
Richard McKinley ◽  
Jordan Grafman
Keyword(s):  
Problem Solving ◽  
Temporal Lobe ◽  
Anterior Temporal Lobe ◽  
Insight Problem ◽  
Insight Problem Solving ◽  
The Right
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