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DTSTAMP:20260424T204929Z
UID:64492c4194f35125823825@ist.ac.at
DTSTART:20230511T160000
DTEND:20230511T170000
DESCRIPTION:Speaker: Laura Busse\nhosted by Wiktor Mlynarski and Maximilian
  Jösch\nAbstract: The narrowband-gamma rhythm (NB-gamma\, 50-70 Hz) is a 
 prominent feature of activity in the mouse's dorsal lateral geniculate nuc
 leus (dLGN) of the thalamus during visual stimulation with uniform full-fi
 eld stimuli of high luminance. However\, it is not clear to what extent NB
 -gamma influences downstream spiking activity in primary visual cortex (V1
 ) and whether it does so during stimulation with naturalistic scenes\, whi
 ch contain complex spatial distributions of luminance. In this study\, we 
 investigated the relationship between spiking activity and the V1 local fi
 eld potential (LFP) in simultaneous extracellular recordings from dLGN and
  V1\, during visual stimulation with a uniform high-luminance stimulus as 
 well as natural scenes. During grey-screen visual stimulation\, we found t
 hat bursts of NB-gamma oscillations in the V1-LFP modulated V1 spiking act
 ivity\, differentially recruiting excitatory vs. inhibitory neurons across
  cortical layers at distinct phases. In the context of natural scenes\, we
  observed that the V1-LFP NB-gamma tracked luminance in a local portion of
  the visual field. Moreover\, when local luminance was high\, we found tha
 t NB-gamma recruited individual V1 neurons with retinotopic specificity. O
 ur results thus show that NB-gamma is not merely a globally uniform rhythm
 \, but that it has a complex temporal and spatial structure capable of tra
 cking luminance in local regions of the visual field. Together\, these fin
 dings imply a role for the NB gamma oscillation for encoding luminance dur
 ing naturalistic vision.
LOCATION:Raiffeisen Lecture Hall\, Central Building\, ISTA
ORGANIZER:mmosiash@ist.ac.at
SUMMARY:Laura Busse: Spatio-temporal dynamics of narrowband-gamma in the mo
 use early visual system
URL:https://talks-calendar.ista.ac.at/events/4153
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