Dopamine and Emotion Processing in Schizotypal Anhedonia


Book Description

Three studies examined emotion processing and dopamine regulation in anhedonia. In Study 1, in multiple assessments of emotional experience (e.g., naturalistic and lab contexts and social and nonsocial situations), people with elevated social anhedonia (n = 40) reported less intensity of positive affect than both controls (n = 30) and people with elevated perceptual aberration-magical ideation (n = 29). Social anhedonia was also associated with providing less emotional content when describing what it is like to experience positive situations. In contrast, both social anhedonia and perceptual aberration-magical ideation were associated with increased frequency of negative affect for their daily experiences. Moreover, social anhedonia was not associated with a decrease specifically in high-arousal emotions. In Study 2 (n = 339), social and physical anhedonia (but not perceptual aberration-magical ideation) were again associated with decreased self-reported positive affect to lab stimuli. Overall, results suggest anhedonia may be associated with a general decrease in self-reported positive affect intensity. The Val(158)Met polymorphism of the catechol-O-methyltransferase (COMT) gene has been associated with aspects of schizophrenia that are possibly related to the disorder's pathogenesis. In study 3, as a group, relatives of patients with schizophrenia who were homozygous for the val allele of the COMT polymorphism showed the highest elevations in self-reported social and physical anhedonia. Associations with the COMT polymorphism were absent in relatives of patients with bipolar disorder and control participants. Findings suggest that anhedonia is manifest in individuals who carry genetic liability for schizophrenia and is associated with the Val(158)Met polymorphism of the COMT gene.




Anhedonia: A Comprehensive Handbook Volume II


Book Description

This is the first comprehensive two-volume collection on anhedonia, a disorder that played an important role in psychopathology theories at the beginning of the twentieth century. Anhedonia is a condition in which the capacity of pleasure is partially or completely lost, and it refers to both a personality trait, and a “state symptom” in various neuropsychiatric and physical disorders. It has a putative neural substrate, originating in the dopaminergic mesolimbic and mesocortical reward circuit. Over the past three decades cognitive psychology and behavioral neuroscience have expanded our understanding of anhedonia and other reward-related processes. The aim of this new two-volume collection on anhedonia is to highlight the contributions of eminent scientists in this field as well as to provide readers with comprehensive accounts of recent developments as perceived by the authors. This monograph is divided into five parts. Volume I contains parts one and two (Conceptual Issues and Neurobiological Advances) including 14 chapters that serve as an introduction and overview of conceptual issues. Volume II contains three parts (Anhedonia in Psychotic Disorders, Anhedonia in Mood and Personality Disorders, and Anhedonia in Neurological and Physical Disorders) including 15 chapters that provide an overview of the construct, measurement of anhedonia in schizophrenia spectrum disorders, hedonic capacity and related factors in schizophrenia and schizoaffective disorder, anhedonia as an indicator of genetic liability for schizophrenia, and as a trait marker for depression, the role of an anhedonia in trauma-related disorders, anorexia nervosa, stress-induced eating disorders, schizotypal traits and risk of suicide. This book will be of interest to a broad spectrum of readers including psychiatrists, psychologists, neurologists, neuroscientists, endocrinologists, pharmacologists, general practitioners, geriatricians, graduate students, and health care providers in the fields of mental health.







Schizotypal Personality


Book Description

This book is devoted to schizotypal personality. It provides a comprehensive overview of our knowledge from some of the world's leading researchers in the field, and includes reviews of genetics, neurodevelopment, assessment, psychophysiology, neuropsychology and brain imaging. Central themes are the exploration of categorical and dimensional approaches to the understanding of schizotypal disorder and its relationship to schizophrenia. Valuable introductory and concluding chapters set in context the sometimes divergent opinions and findings presented by the book's contributors and there are reviews of methodological issues and assessment schedules for the benefit of researchers in the field. In setting out to answer, from phenomenological, psychological and neurobiological perspectives, the fundamental question 'What is schizotypal disorder?' and to develop coherent etiological models, this book will serve as an authoritative resource for clinicians and researchers interested in this major personality disorder.







Psychodiagnosis


Book Description