Did you know?

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 EFFERENCE COPY

Did you know that your brain first creates a copy of the movement that your body performs?

That's called Efference copy.

What is Efference Copy?



In physiology Efference Copy or efferent copy is a copy or picture of a movement formed inside the brain that is to be performed by an organism. These act as a movement producing signals generated by the individuals motor systems.

In other words our brain is capable of predicting the response to an action. Combined with the sensory input from the individual's movement, Efference Copy helps one to adapt the postural changes by comparing the actual movement with the desired movement. Also it enables the individual to distinguish between self induced stimulus and external stimulus. i.e self movements and non self movements. Eg. One cannot tickle himself but gets tickled when someone else does it. Efferent copies are created by one's own movements and not those of others.



Examples of Motor adaptations due to Efference Copy.

  1. The Coriolis Effect :-
              When rotating the trunk the inertial force is automatically generated and an external application of force is not necessary.

       2. Gaze Stability :- 
         By augmenting the vestibulo - ocular reflex Efference Copy helps us to stabilise the eye gaze during head movement and when in motion. 

      3. Grip Force :- 
                 The individual is properly able to grip any load that is being provided because an internal model gives such a good prediction without delay. Individual is very well able to judge the amount of force required and the grip needed to hold an object.







Dr. MARIA JENNIFER SALDANHA (P.T.)
(B.P.T.,C.A.F.T.I.)
For home visits and online sessions 
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+91 8454948909

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