interoception

NOUN
13 LETTERS · STARTS WITH I

interoception is a valid 13-letter word worth 17 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
I1N1T1E1R1O1C3E1P3T1I1O1N1
1 + 1 + 1 + 1 + 1 + 1 + 3 + 1 + 3 + 1 + 1 + 1 + 1 =17 PTS
DOUBLE WORD → 34TRIPLE WORD → 51
MEANING

What does interoception mean?