Mar 29, 2020

In vivo-assessment of the human temporal network: Evidence for asymmetrical effective connectivity

NeuroImage
Yulia NovitskayaAndreas Schulze-Bonhage

Abstract

The human temporal lobe is a multimodal association area which plays a key role in various aspects of cognition, particularly in memory formation and spatial navigation. Functional and anatomical connectivity of temporal structures is thus a subject of intense research, yet by far underexplored in humans due to ethical and technical limitations. We assessed intratemporal cortico-cortical interactions in the living human brain by means of single pulse electrical stimulation, an invasive method allowing mapping effective intracortical connectivity with a high spatiotemporal resolution. Eighteen subjects with normal anterior-mesial temporal MR imaging undergoing intracranial presurgical epilepsy diagnostics with multiple depth electrodes were included. The investigated structures were temporal pole, hippocampus, amygdala and parahippocampal gyrus. Intratemporal cortical connectivity was assessed as a function of amplitude of the early component of the cortico-cortical evoked potentials (CCEP). While the analysis revealed robust interconnectivity between all explored structures, a clear asymmetry in bidirectional connectivity was detected for the hippocampal network and for the connections between the temporal pole and parahippocam...Continue Reading

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Mentioned in this Paper

Amplitude
Electric Stimulation Technique
Bioassay, In Vivo
Analysis
In Vivo
Brain
Temporal Bone Structure
Finding
Detected (Finding)
Spatio-Temporal Analysis

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