Affective valence and P300 when stimulus arousal level is controlled

Visual stimuli from the International Affective Picture System (IAPS) were employed in a modified oddball paradigm to elicit the P300 event-related brain potential (ERP) in young adult females (N=12). The pictures varied on valence (negative, neutral, positive) ratings but had the same medium arousal level ratings. The images were presented as targets with a standard stimulus composed of red/white triangles designed to mimic the spatial frequency of the pictures. P300 amplitude from negative relative to neutral stimuli was smaller over frontal areas, whereas amplitude from positive relative to neutral stimuli did not differ. P300 amplitude differences among valence categories were consistent across the midline electrodes, and did not change over the parietal area where arousal effects are typically observed. The findings suggest that valence affects P300 frontal amplitude, and arousal level should be controlled when using emotional stimuli to elicit ERPs. Theoretical implications are discussed.     

Convergent Validity of the Early Memory Index in Two Primary Care Samples

Karliner, Westrich, Shedler, and Mayman (1996) developed the Early Memory Index (EMI) to assess mental health, narrative coherence, and traumatic experiences in reports of early memories. We assessed the convergent validity of EMI scales with data from 103 women from an urban primary care clinic (Study 1) and data from 48 women and 24 men from a suburban primary care clinic (Study 2). Patients provided early memory narratives and completed self-report measures of psychopathology, trauma, and health care utilization. In both studies, lower scores on the Mental Health scale and higher scores on the Traumatic Experiences scale were related to higher scores on measures of psychopathology and childhood trauma. Less consistent associations were found between the Mental Health and Traumatic Experiences scores and measures of health care utilization. The Narrative Coherence scale showed inconsistent relationships across measures in both samples. In analyses assessing the overall fit between hypothesized and actual correlations between EMI scores and measures of psychopathology, severity of trauma symptoms, and health care utilization, the Mental Health scale of the EMI demonstrated stronger convergent validity than the EMI Traumatic Experiences scale. The results provide support for the convergent validity of the Mental Health scale of the EMI.     

The Association Between Childhood Maltreatment and Coping Strategies: The Indirect Effect Through Attachment

Maladaptive coping strategies represent a potentially treatable component of psychopathologies associated with childhood abuse and neglect. Coping strategies are relatively stable constructs that may be viewed as trait-like behavioral manifestations of larger, albeit less accessible, intra- and interpersonal processes, such as activation of the attachment system. The authors investigated a potential mediational pathway from childhood maltreatment (in the form of physical and emotional abuse experiences) to coping strategies developed in emerging adulthood through attachment organization in a sample of undergraduate psychology research participants at a public Midwestern university (N = 225). Avoidant attachment patterns helped to explain the relationship between increased instances of childhood maltreatment and a decreased use of adaptive coping strategies. Further, both anxious and avoidant attachment mediated the relationship between childhood maltreatment and an increased use of maladaptive coping. By utilizing an attachment theory–informed approach as an explanatory guide, researchers and clinicians may be better able to conceptualize, study, and treat complex cases by understanding the underlying relationships between childhood maltreatment, attachment, and coping.