Society within the Brain provides insightful accounts of scientific research linking social connection with brain and cognitive aging through state-of-the-art research. This involves comprehensive social network analysis, social neuroscience, neuropsychology, psychoneuroimmunology, and sociogenomics. This book provides a scientific discourse on how a society, community, or friends and family interact with individuals' cognitive aging. Issues concerning social isolation, rapidly increasing in modern societies, and the controversy in origins of individual difference in social brain and behaviour are discussed. An integrative framework is introduced to explicate how social networks and support alleviate the effects of aging in brain health and reduce dementia risks. This book is of interest and useful to a wide readership: from gerontologists, psychologists, clinical neuroscientists and sociologists, to those involved in developing community-based interventions or public health policy for brain health, to people interested in how social life influences brain aging or in the prevention of dementia.