a chair having a backrest with pressure points arranged in rows corresponding to vertebra in the cervical , thoracic and lumbar sections of the spine . the rows within the cervical and thoracic sections have at least four pressure points spaced laterally . the rows within the lumbar section have more than four pressure points spaced laterally . within the lumbar section , each successive row includes at least two more pressure points spaced laterally than the previous row . the pressure points each include a protuberance embedded within a layer of elastomeric foam material and each protuberance includes a tip portion that is free of the layer of foam material . the tip portions project from a recessed surface from a backrest surface and are located within a void formed between the recessed surface and a flexible cover . the pressure point afferentation backrest for stimulation of mechanoreceptors is the neuroanatomical clinical outcome basis for the invention .