John Blundell 
Physiological Psychology [PDF ebook] 

Physiological psychology deals with the interaction between 'under the skin’ physiological variables and the personal and social context in which organisms live. Originally published in 1975, much of this book has relevance for the understanding of human action: knowledge of physiological mechanisms underlying psychological functions can throw light on conditions such as obesity, schizophrenia, and the emotional disorders, and on procedures such as psychosurgery and drug therapy.