Neural Basis of the Perception [Read-Only]home.iitk.ac.in/~sachet/se367/hw3/slides.pdf · FOR...
Transcript of Neural Basis of the Perception [Read-Only]home.iitk.ac.in/~sachet/se367/hw3/slides.pdf · FOR...
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Neural Basis of the Perception
and Estimation of Time
SE367 Homework 3
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Previous works
Scalar timing theory(Gibbon et al.1984)
Neurophysiological model of timing(Matell &
Meck 2004)
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EVIDENCE FAVORING A
COMMON TIMING MECHANISM
Work started in late
19th century
Time dependent and
time independent
sources
Temporal processing
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EVIDENCE FAVORING A
UBIQUITOUS TIMING ABILITY
OF CORTICAL NETWORKS
Timing is an inherent computational
ability of every cortical circuit
Psychophysical experiments suggest
that sensory timing is local.
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AN INTERMEDIATE
HYPOTHESIS
Merchant and colleagues (2008c)
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NEUROPHYSIOLOGICAL BASIS
OF TIME ESTIMATION:
RAMPING ACTIVITY IN THE
CORE TIMING CIRCUIT
Most studies report climbing activity
during a variety of timing tasks.
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NEUROANATOMICAL AND
NEUROCHEMICAL SYSTEMS
FOR INTERVAL TIMING
The centrality of the striatum and dopamine (DA) neurotransmission in explicit timing.
Frontoparietal systems may govern attention and working memory, which interact with timekeeping processes
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FUNCTIONAL SIGNIFICANCE OF
BRAIN CIRCUITS THAT GOVERN
INTERVAL TIMING
Pairwise subtractions of brain
activation during time discrimination
(T), pitch discrimination (P), and the
sensorimotor control (C) tasks were
conducted for each period.
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ILLUSIONS OF TIME
Emerging neuroimaging research
suggests that the mechanisms may
be partially context dependent.
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CONCLUSIONS
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THANK YOU!