Psychological science
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Psychological science · Jul 2002
Do lonely days invade the nights? Potential social modulation of sleep efficiency.
Loneliness predicts morbidity and mortality from broad-based causes, but the reasons for this effect remain unclear. Few differences in traditional health behaviors (e.g., smoking, exercise, nutrition) have been found to differentiate lonely and nonlonely individuals. ⋯ These results, which were observed in controlled laboratory conditions and were found to generalize to the home, suggest that lonely individuals may be less resilient than nonlonely individuals in part because they sleep more poorly. These results also raise the possibility that social factors such as loneliness not only may influence the selection of health behaviors but also may modulate the salubrity of restorative behaviors.
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Psychological science · May 2002
Expertise training with novel objects leads to left-lateralized facelike electrophysiological responses.
Scalp event-related potentials (ERPs) in humans indicate that face and object processing differ approximately 170 ms following stimulus presentation, at the point of the N170 occipitotemporal component. The N170 is delayed and enhanced to inverted faces but not to inverted objects. We tested whether this inversion effect reflects early mechanisms exclusive to faces or whether it generalizes to other stimuli as a function of visual expertise. ⋯ The results are consistent with previous reports in that the N170 was delayed and enhanced for inverted faces at recording sites in both hemispheres. For Greebles, the same effect of inversion was observed only for experts, primarily in the left hemisphere. These results suggest that the mechanisms underlying the electrophysiological face-inversion effect extend to visually homogeneous nonface object categories, at least in the left hemisphere, but only when such mechanisms are recruited by expertise.
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Recognition performance is impaired when people are required to provide a verbal description of a complex stimulus (i.e., verbal-overshadowing effect), such as the face of the perpetrator in a simulated robbery. A shift in the processing operations that support successful face recognition is believed to underlie this effect. Specifically, when participants shift from a global to a local processing orientation, face recognition is impaired. ⋯ Rather, face recognition can be disrupted by a task (i.e., letter identification) that triggers the activation of a local processing orientation. Conversely, the activation of a global processing orientation can enhance the accuracy offace recognition. The theoretical and practical implications of these findings for recent treatments of verbal overshadowing and memory function are considered.