Exaggerated Activation of Dorsal Anterior Cingulate Cortex During Cognitive Interference: A Monozygotic Twin Study of Posttraumatic Stress Disorder

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.

From the Department of Psychology, Tufts University, Medford, Mass.; the Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston; VA Research Service, Manchester, N.H.; the Department of Psychology, Yale University, New Haven, Conn.; and the Department of Psychiatry, McLean Hospital, Belmont, Mass.