Final answer:
The two major somatosensory agnosias are stereognosis and graphesthesia, which involve recognizing objects by touch and identifying numbers or letters traced on the palm, respectively.
Step-by-step explanation:
The two major somatosensory agnosias are stereognosis and graphesthesia. Stereognosis is the ability to recognize objects by touch, with common examples being the identification of coins by their size, weight, and texture. Graphesthesia involves recognizing numbers or letters that are written on one's palm with a dull pointer. Both of these tasks require intact sensory perception and processing, and deficiencies in these tasks can indicate neurological disorders or injuries affecting the somatosensory pathways or cortical regions responsible for sensory perception.