06 sensory processing
Post on 01-Jul-2015
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Sensory Signal Processing
Information
Sensation Perception
Attributes of a Stimulus
1. Modality
2. Location
3. Timing
4. Intensity
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:
Modality Is Encoded by a Labeled Line Code –
•Stimulus transduction
•Receptor specificity
•Stimulus threshold
The Spatial Distribution of Sensory Neurons Activated by a Stimulus Conveys Information About the Stimulus
Location
Weber’s Law of “Just Noticeable Difference”
Sensory thresholds
Stimulus intensity is encoded by frequency of AP
Sensory Systems Have a Common Plan
Somatic Sensory Signal Processing
Somatic Sensory Receptors
Excitation of sensory nerve
Types of nerve fiber - Principle of Connectional Specificity
Dermatomes
Trigeminal nerve
Central Pathway
Thalamus
Sensory Cortex
Thalamocortical projection
Integration of tactile information by Cortex
The columnar organization of cortical neurons
Each region of the somatic sensory cortex receives inputs from primarily one type of receptor.
Two Point Discrimination
Two Point Discrimination
Shape and Size Sensation
Spatial and Temporal Summation
Vibration Sense
Pain Signal Processing
Types of Pain
Pain Perception
Pain Pathway
Dual Pathways for Transmission of Pain Signals into the Central Nervous System
Nociceptive Components of the Thalamus and Cortex
Gate control theory
Pain Modulation
The Placebo Effect
Sensitization
Visceral Pain
Phantom Limbs and Phantom Pain
Energy channels
Chakra or Energy center
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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