1.   In this study we classified rectal sensations elicited by isobaric distensions according to the segmental steady state values obtained.

2.   Previous results have shown a higher threshold of rectal sensation in men than in women.

3.   The absence of both voluntary contraction of the external sphincter and rectal sensation confirms that patients with complete supraconal lesions lose conscious control of sphincter activity.

4.   Although the spinal patients had no specific rectal sensation during rectal distension, almost half of them experienced a dull pelvic sensation at maximum distension.

5.   The external anal sphincter response to rectal distension is very closely associated with both rectal sensation and rectal contraction in normal subjects, and presumably acts to prevent soiling.

6.   Rectal sensation was within the range of our control group in all incontinent patients.

7.   The clinical significance of the motor abnormality is also confirmed by the fact that rectal sensation and the rectoanal inhibitory reflex were not significantly changed in our patients.