Contact receptors are receptors that transmit stimuli upon direct contact with objects or substances that act on them. These are tactile, temperature, pain, taste and olfactory receptors.
There is a lot of controversy about olfactory receptors. Charles Sherrington referred them to distant receptors due to the fact that with the help of smell one can navigate relative to distant objects. But V.P. Zinchenko attributed them to contact receptors, since olfactory sensations arise only with the direct action of odorous substance molecules on olfactory chemoreceptors.
Contact receptors differ from distant receptors that respond to stimuli emanating from a distant object.
Receptors that respond to vibration occupy an intermediate position, since the vibration itself, depending on the wavelength, can be both shaking and hum, a very low sound.