Volumetric mesoscopic electrophysiology: a new imaging modality for the non-human primate

Author:

Teichert Tobias,Papp László,Vincze Ferenc,Burns Nioka,Goodell Baldwin,Ahmed Zabir,Holmes Andrew,Gray Charles M,Chamanzar Maysam,Gurnsey Kate

Abstract

AbstractThe primate brain is a densely interconnected organ whose function is best understood by recording from the entire structure in parallel, rather than parts of it in sequence. However, available methods either have limited temporal resolution (functional magnetic resonance imaging), limited spatial resolution (macroscopic electroencephalography), or a limited field of view (microscopic electrophysiology). To address this need, we developed a volumetric, mesoscopic recording approach (MePhys) by tessellating the volume of a monkey hemisphere with 992 electrode contacts that were distributed across 62 chronically implanted multi-electrode shafts. We showcase the scientific promise of MePhys by describing the functional interactions of local field potentials between the more than 300,000 simultaneously recorded pairs of electrodes. We find that a subanesthetic dose of ketamine –believed to mimic certain aspects of psychosis– can create a pronounced state of functional disconnection and prevent the formation of stable large-scale intrinsic states. We conclude that MePhys provides a new and fundamentally distinct window into brain function whose unique profile of strengths and weaknesses complements existing approaches in synergistic ways.

Publisher

Cold Spring Harbor Laboratory

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