Sensory code Flashcards
Definition of sensory code
- the ability of CNS to recognize the modality (type), the locality
(site) and the intensity (degree) of sensation. - Brain decodes encoded stimuli reaching it
Modality of sensation: depends on:
- Adequate Stimulus:
- Muller’s law of specific nerve energy:
- Labeled line principle:
Labeled line principle
Each sensation reaches the CNS in a specific pathway. Stimulation of this pathway at any point evokes its specific sensation.
Each sensation reaches the CNS in a specific pathway. Stimulation of this pathway at any point evokes its specific sensation.
Labeled line principle
Whatever the method of stimulation of the receptor is, the given sensation is that the receptor is specialized to, irrespective of the method of stimulation
Muller’s law of specific nerve energy
Each receptor is specialized to receive a Type of receptor particular type of stimulus.
Adequate Stimulus:
Locality of the stimulus:
the Law of Projection),
Phantom limb phenomenon)
Law of Projection
Intensity of sensation:
- number of receptors
- frequency of impulses:
recruitment
number of receptors
100 fold increase in stimulus intensity, will increase the perceived sensation by,
2 times
100 fold increase in stimulus intensity, will increase the perceived sensation by 2 times, which law
Weber-Fechner principle:
Weber-Fechner principle: detects
vision and hearing
Steven’s Power principle types
- A> 1: expansive function
- A=1: Linear relationship
- A<1: compressive function
Example for :
- A> 1: expansive function
- A=1: Linear relationship
- A<1: compressive function
A> 1: expansive function e.g.: electric shock.
A=1: Linear relationship e.g.: perception of length.
A<1: compressive function e.g.: loudness & brightness.(Weber-Fechner principle)
