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Ergebnisse 2 Einträge
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One approach to investigate psychophysiological processes occurring in the Concealed Information Test (CIT) is to use a parallel task, which engages specific mental activity in addition to the CIT. In the present study, the influence of an interfering n-back task on the physiological responses in a Concealed Information Test (CIT) was investigated. Forty participants underwent a mock-crime experiment with a modified CIT. In a within-subject design, the CIT was applied in blocks with and without an additional n-back task. Electrodermal activity (EDA), respiration line length (RLL), heart rate (HR), and finger pulse waveform length (FPWL) were registered. Reaction times in the n-back task and the CIT were recorded. The parallel task enhanced the differential EDA response to probe vs. irrelevant items, while it diminished the response differences for RLL and phasic HR. Results shed light upon working-memory-related processes in the CIT. The diverging effects of the interfering mental activity on electrodermal and cardiopulmonary measures, if replicable, might contribute to a better understanding of the psychophysiological responsiveness underlying the CIT.
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Event-related functional magnetic resonance imaging was applied to identify cortical areas involved in maintaining target information in working memory used for an upcoming grasping action. Participants had to grasp with their thumb and index finger of the dominant right hand three-dimensional objects of different size and orientation. Reaching-to-grasp movements were performed without visual feedback either immediately after object presentation or after a variable delay of 2-12 s. The right inferior parietal cortex demonstrated sustained neural activity throughout the delay, which overlapped with activity observed during encoding of the grasp target. Immediate and delayed grasping activated similar motor-related brain areas and showed no differential activity. The results suggest that the right inferior parietal cortex plays an important functional role in working memory maintenance of grasp-related information. Moreover, our findings confirm the assumption that brain areas engaged in maintaining information are also involved in encoding the same information, and thus extend previous findings on working memory function of the posterior parietal cortex in saccadic behavior to reach-to-grasp movements.
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Team
Eintragsart
Sprache
- Englisch (2)
Thema
- Memory, Short-Term/*physiology
- Adolescent (1)
- Adult (2)
- Attention/physiology (1)
- Brain Mapping (1)
- Cognition/*physiology (1)
- Female (2)
- Galvanic Skin Response/*physiology (1)
- Guilt (1)
- Hand Strength/*physiology (1)
- Heart Rate/*physiology (1)
- Humans (2)
- Image Processing, Computer-Assisted (1)
- Inhibition, Psychological (1)
- Magnetic Resonance Imaging (1)
- Male (2)
- Motor Cortex/physiology (1)
- Orientation/physiology (1)
- Oxygen/blood (1)
- Parietal Lobe/*physiology (1)
- Perceptual Masking/*physiology (1)
- Photic Stimulation/methods (1)
- Psychomotor Performance/*physiology (1)
- Respiratory Rate/physiology (1)
- Somatosensory Cortex/physiology (1)
- Space Perception/*physiology (1)
- Supine Position/physiology (1)
- Visual Cortex/physiology (1)
- Visual Perception/physiology (1)
- Young Adult (2)