Astrocytic Response to Acutely- and Chronically-Implanted Microelectrode Arrays in the Marmoset () Brain.

Microelectrode implants are an important tool in neuroscience research and in developing brain⁻machine interfaces. Data from rodents have consistently shown that astrocytes are recruited to the area surrounding implants, forming a glial scar that increases electrode impedance and reduces chronic utility. However, studies in non-human primates are scarce, with none to date in marmosets.

Neuronal Assemblies Evidence Distributed Interactions within a Tactile Discrimination Task in Rats.

Accumulating evidence suggests that neural interactions are distributed and relate to animal behavior, but many open questions remain. The neural assembly hypothesis, formulated by Hebb, states that synchronously active single neurons may transiently organize into functional neural circuits-neuronal assemblies (NAs)-and that would constitute the fundamental unit of information processing in the brain. However, the formation, vanishing, and temporal evolution of NAs are not fully understood.

Spectral characteristics of the hippocampal LFP during contextual fear conditioning.

Objective: The hippocampus has an important role in the acquisition and recall of aversive memories. The objective of this study was to investigate the relationship among hippocampal rhythms.

Methods: Microeletrodes arrays were implanted in the hippocampus of Wistar rats.