Morally Insane?

Frontotemporal dementia (FTD) is second only to Alzheimer’s in the number of people it affects. Around one-fifth of all early onset (younger than fifty) dementia is FTD. And while it is called dementia, it rarely results in loss of memory, language or perception. It is more a disorder of abnormal behaviour. It is caused by the progressive destruction of a special type of neuron (the spindle neuron) connecting the amygdala (our central emotional processing unit) to the aPFC (our considered response unit). Other neurons are not destroyed by the disease.

The spindle neuron is only found in great apes (humans, gorillas, orangutans, chimpanzees and bonobos), some species of whale, dolphins and elephants. They are the same neurons in all these animals but there