Download - 06 sensory processing
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Sensory Signal Processing
Information
Sensation Perception
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Attributes of a Stimulus
1. Modality
2. Location
3. Timing
4. Intensity
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Sensory Modality Is Determined by the Stimulus Energy
The same cause, such as electricity, can simultaneously affect all sensory
organs, since they are all sensitive to it; and yet, every sensory nerve
reacts to it differently; one nerve perceives it as light, another hears its
sound, another one smells it; another tastes the electricity, and another
one feels it as pain and shock. One nerve perceives a luminous picture
through mechanical irritation, another one hears it as buzzing, another
one senses it as pain. . .. . . Sensation is not the conduction of a quality or
state of external bodies to consciousness, but the conduction of a quality
or state of our nerves to consciousness, excited by an external cause.
Johannes Müller 1826 Handbuch der Physiologie des Menschen für Vorlesungen, 2nd Ed., translated by Edwin Clarke and Charles Donald O'Malley:
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Modality Is Encoded by a Labeled Line Code –
•Stimulus transduction
•Receptor specificity
•Stimulus threshold
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The Spatial Distribution of Sensory Neurons Activated by a Stimulus Conveys Information About the Stimulus
Location
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Weber’s Law of “Just Noticeable Difference”
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Sensory thresholds
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Stimulus intensity is encoded by frequency of AP
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Sensory Systems Have a Common Plan
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Somatic Sensory Signal Processing
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Somatic Sensory Receptors
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Excitation of sensory nerve
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Types of nerve fiber - Principle of Connectional Specificity
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Dermatomes
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Trigeminal nerve
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Central Pathway
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Thalamus
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Sensory Cortex
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Thalamocortical projection
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Integration of tactile information by Cortex
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The columnar organization of cortical neurons
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Each region of the somatic sensory cortex receives inputs from primarily one type of receptor.
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Two Point Discrimination
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Two Point Discrimination
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Shape and Size Sensation
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Spatial and Temporal Summation
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Vibration Sense
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Pain Signal Processing
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Types of Pain
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Pain Perception
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Pain Pathway
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Dual Pathways for Transmission of Pain Signals into the Central Nervous System
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Nociceptive Components of the Thalamus and Cortex
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Gate control theory
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Pain Modulation
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The Placebo Effect
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Sensitization
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Visceral Pain
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Phantom Limbs and Phantom Pain
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Energy channels
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Chakra or Energy center
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Memory of pain beyond present life
Rangeetha L. Balsuriya 20Y/FPresenting symptom
– Pain in abdomen, back and chest x 7months admitted 5 times in the hospital without relief
Examination: Normal except scoliosisInvestigation: X-Spine – Lumbar scoliosis
– MRI spine, IVP, Biochemistry, Urine Normal
Diagnosis: Somatoform Pain disorderTreatment:• Stopped all analgesic• Relaxation therapy • Interferential therapy• Placebo analgesia• Transient relief of pain with any new
mode of treatment• Planed to start Hypnotic regression to
see any childhood psychogenic trauma causing present problem
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