Bipolar Disorder, Major Depressive Disorder
Conditions
Keywords
Depression, Bipolar Disorder, Reward Processing
Brief summary
The purpose of this project is to use behavioral techniques to investigate emotional processing in subjects with major depression and healthy comparison subjects.
Detailed description
A promising strategy for parsing the heterogeneity of Major Depressive Disorder is to identify phenotypes characterized by reliable functional abnormalities. Anhedonia, the lack of reactivity to pleasurable stimuli, is considered a trait marker for depression. Using an objective behavioral task this project aims to investigate hedonic capacity in subjects meeting a DSM-IV diagnosis of Major Depressive Disorder.
Interventions
None listed
Sponsors
Massachusetts General Hospital
Affective Neuroscience Laboratory
Study design
Observational model
COHORT
Time perspective
CROSS_SECTIONAL
Eligibility
Sex/Gender
ALL
Age
18 Years to 64 Years
Healthy volunteers
Yes
Inclusion criteria
Depressed participants: * Right-handed * DSM-IV diagnosis of MDD * Score of at least 17 on the 21-item HAM-D scale * Absence of any psychotropic medications for at least 2 weeks (6 months for dopaminergic drugs (including methylphenidate), 6 weeks for fluoxetine, and 4 weeks for neuroleptics and benzodiazepines because of longer half-lives.) * No current or past history of MDD with psychotic features * Absence of any other Axis I or Axis II diagnosis (Including bipolar disorder and current or lifetime history of alcohol or substance abuse or dependence.) Particularly, subjects with a history of alcoholism and substance abuse will be excluded, since dopaminergic alterations have been reported in these conditions. Exclusion of patients with comorbid Axis I or Axis II diagnoses will be necessary as evidence exists of alteration in dopamine receptor density in detached personality and social phobia. The alteration of dopamine in the brain may in turn alter behavior. * Absence of significant medical conditions * Absence of ECT in the previous 6 months * Ability to provide informed consent/authorization Bipolar participants: * Both genders and all ethnic origins * Age between 18 and 64 * Right-handed * DSM-IV diagnosis of Bipolar Disorder I or II * Score of at least 17 on the 21-item Hamilton Depression Rating Scale (HAM-D) * Absence of any psychotropic medications for at least 2 weeks (6 months for dopaminergic drugs (including methylphenidate), 6 weeks for fluoxetine, and 4 weeks for neuroleptics and benzodiazepines because of longer half-lives.) * No current or past history of MDD with psychotic features * Absence of any other Axis I or Axis II diagnosis (Including current or lifetime history of alcohol or substance abuse or dependence.) Particularly, subjects with a history of alcoholism and substance abuse will be excluded. * Absence of significant medical conditions * Absence of ECT in the previous 6 months * Ability to provide informed consent/authorization Control Participants: * Right-handed * Absence of medical, neurological, and psychiatric illness (including alcohol and substance abuse), as assessed by the SCID * Absence of any medications for at least 2 weeks * Informed consent/authorization
Exclusion criteria
* Left-handed/ambidextrous * Evidence of neurological illness * Current alcohol or substance abuse * Serious suicide or homicide risk
Countries
United States
Outcome results
None listed