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Welcome to our ABC Seminars! This seminar series is open for everyone. The talk will take place in . After the talks, coffee and pulla will be served.

The event will be also streamed via Zoom at: 

Title: In Vivo Magnetic Recording of Neuronal Activity, and Functions of Brain Rhythms

Abstract:This talk will have two parts, one on magnetic recordings and one on brain rhythms and their functions. I will first show that giant magnetoresistance (GMR) sensors can be miniaturized to micron size, and then introduced into the brain to record both event-related fields from groups of neurons and action potentials of isolated single neurons. I will then show that brain rhythms likely subserve functions. For example, when visual stimuli are repeated, they induce reduced firing rates yet enhanced gamma-band synchronization, likely to maintain postsynaptic impact. This impact is indeed optimal for gamma-rhythmic inputs, as I will show by controlling inputs with optogenetics. Optogenetics can also be used to control top-down inputs. I will show that this Opto-Top-Down induces strong, up to several fold, changes in gamma-band synchronization together with much smaller changes in firing rate and no correlation between the two effects.