In the February 1991 Kickshaws, Dave Morice introduced the concept of the palindrome ladder, one which starts with a word and travels to its reversal changing one letter at a time passing through a palindrome at its central rung.
"Reflective Word Networks,"
Word Ways: Vol. 24
, Article 11.
Available at: http://digitalcommons.butler.edu/wordways/vol24/iss2/11