Learning
alters
cortical
representations
and
improves
perception.
Apical
tuft
dendrites
in
layer
1,
which
are
unique
their
connectivity
biophysical
properties,
may
be
a
key
site
of
learning-induced
plasticity.
We
used
both
two-photon
SCAPE
microscopy
to
longitudinally
track
tuft-wide
calcium
spikes
apical
5
pyramidal
neurons
barrel
cortex
as
mice
learned
tactile
behavior.
Mice
were
trained
discriminate
two
orthogonal
directions
whisker
stimulation.
Reinforcement
learning,
but
not
repeated
stimulus
exposure,
enhanced
selectivity
for
equally,
even
though
only
one
was
associated
with
reward.
Selective
tufts
emerged
from
initially
unresponsive
or
low-selectivity
populations.
Animal
movement
choice
did
account
changes
selectivity.
Enhanced
persisted
after
rewards
removed
animals
ceased
performing
the
task.
conclude
that
learning
produces
long-lasting
realignment
dendrite
responses
behaviorally
relevant
dimensions
Nature,
Год журнала:
2022,
Номер
607(7918), С. 330 - 338
Опубликована: Июль 6, 2022
Abstract
Transcriptomics
has
revealed
that
cortical
inhibitory
neurons
exhibit
a
great
diversity
of
fine
molecular
subtypes
1–6
,
but
it
is
not
known
whether
these
have
correspondingly
diverse
patterns
activity
in
the
living
brain.
Here
we
show
primary
visual
cortex
(V1)
correlates
with
brain
state,
which
are
organized
by
single
factor:
position
along
main
axis
transcriptomic
variation.
We
combined
vivo
two-photon
calcium
imaging
mouse
V1
method
to
identify
mRNA
for
72
selected
genes
ex
slices.
classified
imaged
layers
1–3
into
three-level
hierarchy
5
subclasses,
11
types
and
35
using
previously
defined
clusters
3
.
Responses
stimuli
differed
significantly
only
between
cells
Sncg
subclass
uniformly
suppressed,
other
subclasses
predominantly
excited.
Modulation
state
at
all
hierarchical
levels
could
be
largely
predicted
from
first
principal
component,
also
correlations
simultaneously
recorded
cells.
Inhibitory
fired
more
resting,
oscillatory
states
had
smaller
fraction
their
axonal
projections
layer
1,
narrower
spikes,
lower
input
resistance
weaker
adaptation
as
determined
vitro
7
expressed
cholinergic
receptors.
Subtypes
during
arousal
opposite
properties.
Thus,
simple
principle
may
explain
how
shape
state-dependent
processing.
Neocortex
is
classically
divided
into
distinct
areas,
each
specializing
in
different
function,
but
all
could
benefit
from
reinforcement
feedback
to
inform
and
update
local
processing.
Yet
it
remains
elusive
how
global
signals
like
reward
punishment
are
represented
cortical
computations.
Previously,
we
identified
a
neuron
type,
vasoactive
intestinal
polypeptide
(VIP)-expressing
interneurons,
auditory
cortex
that
recruited
by
behavioral
reinforcers
mediates
disinhibitory
control
inhibiting
other
inhibitory
neurons.
As
the
same
circuit
present
virtually
throughout
cortex,
wondered
whether
VIP
neurons
likewise
cortex.
We
monitored
neural
activity
dozens
of
regions
using
three-dimensional
random
access
two-photon
microscopy
fiber
photometry
while
mice
learned
an
discrimination
task.
found
during
initial
learning
produce
rapid,
cortex-wide
activation
most
interneurons.
This
recruitment
mode
showed
variations
temporal
dynamics
individual
across
areas.
Neither
weak
sensory
tuning
interneurons
visual
nor
their
arousal
state
modulation
was
fully
predictive
reinforcer
responses.
suggest
response
supports
cell-type-specific
mechanism
which
organism-level
information
about
regulates
processing
plasticity.
Neuron,
Год журнала:
2022,
Номер
110(24), С. 4176 - 4193.e10
Опубликована: Окт. 13, 2022
Behavioral
states
can
influence
performance
of
goal-directed
sensorimotor
tasks.
Yet,
it
is
unclear
how
altered
neuronal
sensory
representations
in
these
relate
to
task
and
learning.
We
trained
water-restricted
mice
a
two-whisker
discrimination
study
cortical
circuits
underlying
perceptual
decision-making
under
different
levels
thirst.
identified
somatosensory
cortices
as
well
the
premotor
cortex
part
circuit
necessary
for
execution.
Two-photon
calcium
imaging
areas
populations
selective
or
motor
events.
Analysis
during
individual
sessions
revealed
distinct
behavioral
induced
by
decreasing
thirst-related
motivation.
Learning
was
better
explained
improvements
motivational
state
control
rather
than
association.
Whisker
were
across
states.
In
particular,
whisker
stimuli
could
be
decoded
from
activity
high
states,
suggesting
that
state-dependent
changes
processing
decision-making.
Cell Reports,
Год журнала:
2023,
Номер
42(9), С. 113088 - 113088
Опубликована: Сен. 1, 2023
Cortical
circuit
function
is
regulated
by
extensively
interconnected,
diverse
populations
of
GABAergic
interneurons
that
may
play
key
roles
in
shaping
operation
according
to
behavioral
context.
A
specialized
population
co-express
vasoactive
intestinal
peptides
(VIP-INs)
are
activated
during
arousal
and
innervate
other
INs
pyramidal
neurons
(PNs).
Although
state-dependent
modulation
VIP-INs
has
been
studied,
their
role
regulating
sensory
processing
less
well
understood.
We
examined
the
impact
primary
visual
cortex
awake
behaving
mice.
Loss
VIP-IN
activity
alters
somatostatin-expressing
(SST-INs)
but
not
PNs.
In
contrast,
reduced
globally
disrupts
feature
selectivity
for
stimulus
size.
Moreover,
on
perceptual
behavior
varies
with
context
more
acute
small
than
large
cues.
thus
contribute
both
cortical
context-dependent
performance.
Abstract
Revealing
the
connectivity
of
functionally
identified
individual
neurons
is
necessary
to
understand
how
activity
patterns
emerge
and
support
behaviour.
Yet
brain-wide
presynaptic
wiring
rules
that
lay
foundation
for
functional
selectivity
remain
largely
unexplored.
Cortical
neurons,
even
in
primary
sensory
cortex,
are
heterogeneous
their
selectivity,
not
only
stimuli
but
also
multiple
aspects
Here,
investigate
underlying
pyramidal
behavioural
state
1–10
somatosensory
cortex
(S1),
we
used
two-photon
calcium
imaging,
neuropharmacology,
single-cell-based
monosynaptic
input
tracing
optogenetics.
We
show
state-dependent
stable
over
time.
These
minimally
affected
by
direct
neuromodulatory
inputs
driven
primarily
glutamatergic
inputs.
Analysis
networks
with
distinct
profiles
revealed
although
state-related
state-unrelated
shared
a
similar
pattern
local
within
S1,
long-range
differed.
Individual
cortical
irrespective
properties,
received
converging
from
main
S1-projecting
areas.
tracked
smaller
proportion
motor
larger
thalamic
Optogenetic
suppression
reduced
this
was
externally
driven.
Our
results
reveal
as
substrate
preconfigured
network
dynamics
associated
state.
Neuropsychopharmacology,
Год журнала:
2022,
Номер
48(1), С. 121 - 144
Опубликована: Авг. 29, 2022
Synaptic
plasticity
configures
interactions
between
neurons
and
is
therefore
likely
to
be
a
primary
driver
of
behavioral
learning
development.
How
this
microscopic-macroscopic
interaction
occurs
poorly
understood,
as
researchers
frequently
examine
models
within
particular
ranges
abstraction
scale.
Computational
neuroscience
machine
offer
theoretically
powerful
analyses
in
neural
networks,
but
results
are
often
siloed
only
coarsely
linked
biology.
In
review,
we
connections
these
areas,
asking
how
network
computations
change
function
diverse
features
vice
versa.
We
review
can
controlled
at
synapses
by
calcium
dynamics
neuromodulatory
signals,
the
manifestation
changes
their
impacts
specialized
circuits.
conclude
that
metaplasticity-defined
broadly
adaptive
control
plasticity-forges
across
scales
governing
what
groups
can't
learn
about,
when,
ends.
The
metaplasticity
discuss
acts
co-opting
Hebbian
mechanisms,
shifting
properties,
routing
activity
brain
systems.
Asking
operations
go
awry
should
also
useful
for
understanding
pathology,
which
address
context
autism,
schizophrenia
Parkinson's
disease.