Stimulus

STIMULUS

Classification of Qualitative stimulus

  • Chemical stimuli: Strong acid or alkali or any chemical irritant inducing excitability.
  • Thermal stimuli: Heat applied to the skin causing the excitability.
  • Mechanical stimuli: Pinching, pin prick causing the excitability.
  • Osmotic stimuli: Tissue when subjected to hypo or hypertonic solutions will be stimulated.
  • Electrical stimuli: Exposed to shock.

The electrical stimulus is more or less similar to the natural stimulus present in the body. Moreover, the strength of the electrical stimulus can be regulated as required. So it is often preferred for conducting experiment. Based on the strength( Quantitative) of the electrical stimulus it is classified as follows

  • Sub-minimal or sub-threshold strength
  • Minimal or threshold strength
  • Sub-maximal or above threshold strength
  • Maximal strength
  • Above  maximal strength    (destructible to the tissues) 
Last modified: Thursday, 26 May 2011, 5:57 AM