Active Perception and the Brains Descending Control of Sensory Processing: with Examples from an Ele

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Active Perception and the Brains Descending
Control of Sensory Processing with Examples
from an Electric Fish.
Curtis Bell Neurological Sciences
Institute Oregon Health and Science University
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Perception is unconscious inference.
- Helmholtz
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Corollary Discharge Signals Keep the World Stable
During Smooth Pursuit Eye Movements
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Non-Conducting Object
Conducting Object
Lissman, 1963
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Afferent Fiber from Mormyromast Electroreceptor
Szabo and Fessard, 1965
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Effects of Objects on Afferent Responses
Gomez et al., 2003
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From Lionel Gomez
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Electric Organ Corollary Discharge Effects in
Active Electrolocation System
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Electric Organ Corollary Discharge Effects in
Active Electrolocation System
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Cells of the Mormyrid Electrosensory Lobe (ELL)
Meek, 1999
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Basic Circuit of Electrosensory Lobe
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Synaptic Inputs to Granular Cells Recorded in
Mormyromast Afferents
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Granular Layer Cell Responding to Sensory
Stimuli at Different Delays Following the EOD
Command Signal
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Use of Corollary Discharge to Measure Afferent
Latency
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Behavioral Demonstration of Corollary Discharge
Role in Latency Decoding
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Electric Organ Corollary Discharge Effects in
Active Electrolocation System
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Schema of Cerebellum-like Structures
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Basic Circuit of Electrosensory Lobe
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On Efferent Cell(Large fusiform cell)
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Electric Organ Corollary Discharge Plasticity in
the Ampullary system
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Basic Circuit of Electrosensory Lobe
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EOCD responses of Medium Ganglion Cells
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Plasticity of EOCD-evoked EPSP Following Pairing
with Dendritic Spike
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Pairing with Postsynaptic Dendritic Spike Induces
Synaptic Depression
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Anti-Hebbian spike timing dependent synaptic
plasticity
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Collaborators

• Holly Campbell (NSI) - In vivo studies.
• Angel Caputi (Uruguay) - In vivo
  studies.
• Kirsty Grant (France) - In vivo
  and in vitro studies.
• Victor Han (NSI) - In vitro
  studies.
• Hans Meek (Netherlands) -
  Morphology.
• Claudia Mohr (NSI) - In
  vivo studies.
• Patrick Roberts (NSI) -
  Mathematical modeling.
• Nathaniel Sawtell (NSI) - In vivo studies
• Gerhard von der Emde (Germany) - In vivo and
  behavioral studies.

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