Vikaas Sohal
@vikaassohal.bsky.social
120 followers 48 following 12 posts
Systems neuroscientist and psychiatrist at UCSF studying how inhibitory circuits and oscillations give rise to the emergent brain functions that underlie cognition and emotion.
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vikaassohal.bsky.social
The second, led by Carlos Johnson-Cruz, compares PFC Ca2+ imaging in normal mice vs. mutants with reversible cognitive deficits. Task encoding (including outcome-encoding) normally reorganizes as mice learn new rules but becomes abnormally stable during perseveration: www.biorxiv.org/content/10.1...
Circuit inhibition promotes the dynamic reorganization of prefrontal task encoding to support cognitive flexibility
The mammalian prefrontal cortex encodes variables related to goal-directed behavior, and enables flexibility during environmental changes, making it critical to understand how the dynamic updating vs....
www.biorxiv.org
vikaassohal.bsky.social
This work, made possible through a collaboration with the Schnitzer lab, shows that gamma oscillations are not unitary phenomena characterized by a microcircuit-wide pattern of entrainment, but rather comprise diverse motifs that are flexibly recruited to subserve specific behavioral functions.
vikaassohal.bsky.social
Two preprints up! The first, led by Aarron Phensy, uses red+green voltage indicators to show that prefrontal gamma oscillations dynamically engage various cell types, creating multiple synchrony configurations, each tied to a distinct aspect of cognitive flexibility: www.biorxiv.org/content/10.1...
Prefrontal gamma oscillations engage dynamic cell type-specific configurations to support flexible behavior
Cognitive dysfunction in conditions such as schizophrenia involves disrupted communication between the prefrontal cortex (PFC) and mediodorsal thalamus (MD). Parvalbumin interneurons (PVI) are known t...
www.biorxiv.org
vikaassohal.bsky.social
New work! Learning is assumed to involve synaptic plasticity, but which specific synapses change to enable higher order cognitive functions? We actually find that cognitive flexibility involves potentiation of long-range GABAergic synapses from prefrontal PV neurons: www.biorxiv.org/content/10.1...
Synaptic plasticity of prefrontal long-range inhibition regulates cognitive flexibility
While glutamatergic synaptic plasticity is believed to be a fundamental mechanism mediating learning, the behavioral significance of plasticity at cortical GABAergic synapses remains less well underst...
www.biorxiv.org
vikaassohal.bsky.social
This was followed by @viditavaidya.bsky.social hosting me at the legendary HutmentLab @tifrscience.bsky.social. It was super cool to see @rhythmicspikes.bsky.social's new lab at NCBS, before finishing my “tour” with Laxmi Rao at NIMHANS. Thanks all for this incredibly meaningful visit! 2/2
vikaassohal.bsky.social
Also while I’m posting on BlueSky for the first time, I want to thank to several folks for hosting me last month on a journey where I got to connect with neuroscience in India. First I got to participate in a great symposium on autism and visit Sourav Banerjee’s lab at the NBRC near Delhi. 1/2
vikaassohal.bsky.social
Finally, LiCl treatment, which we and the Rubenstein lab previously found rescues synaptic and behavioral abnormalities in Tbr1 cKO mice, also seems to reverse at least some of the observed abnormalities in neural activity. 4/n
vikaassohal.bsky.social
Similar to our prior finding from Shank3 KO mice, multineuron coordination within social ensembles is diminished in Tbr1 cKO mice. The inability of neurons to act synergistically in order to encode social information via correlated activity may be a convergent feature of diverse autism models. 3/n
vikaassohal.bsky.social
Using neural network classifiers, we found PFC social ensembles that undergo re- (and pre-) activation, plus ensembles which predict approach/avoidance decisions. These signals are all lost in Tbr1 cKO mice. 2/n
Reposted by Vikaas Sohal
fxia.bsky.social
Excited to share our new paper out now @natureportfolio.bsky.social, where we identified neural signatures of stress susceptibility and resilience in the amygdala-ventral hippocampal network to enable control of anhedonia!

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