A lack of affect, particularly in fear to threat or aversive situations due to bilateral removal of the amygdala and inferior temporal cortex. It is also marked by hyperorality (tendency to examine objects orally), hypersexuality & indiscriminate dietary behaviour (eating previously rejected food).
Kolb, B. & Whishaw, I.Q. (2009). Fundamentals of Human Neuropsychology (6th Edition). pp. 561-562. New York: Worth Publishers.