Excerpted from Wikipedia:

As a researcher, Dr.Damasio main interest is the neurobiology of the mind, especially neural systems which subserve memory, language, emotion, and decision-making. His research has helped to elucidate the neural basis for the emotions and has shown that emotions play a central role in social cognition and decision-making. Damasio has formulated the somatic markers hypothesis.

As a clinician, he and his collaborators study and treat the disorders of behavior and cognition, and movement disorders.

Damasio books deal with the relationship between emotions and feelings, and what are their bases in the brain.

*Descartes' Error: Emotion, Reason, and the Human Brain 1994

*The Somatic marker hypothesis and the possible functions of the prefrontal cortex, 1996

*The Feeling of What Happens: Body and Emotion in the Making of Consciousness, 1999

*Looking for Spinoza: Joy, Sorrow, and the Feeling Brain, 2003