Dopamine: A Substance with Many Messages

Researchers recently localised and identified the most important types of nerve cells involved in forming positive and negative memories of a fruit fly. All four nerve cell types they discovered use dopamine to communicate with other nerve cells. Three of the nerve cell types assume various functions in mediating negative stimuli, while the fourth enables the fly to form positive memories.

Parsons & Charlesworth

Source: Dopamine: A Substance with Many Message