| 61. |
- Stenberg, Georg, 1947-, et al.
(författare)
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Personality and augmenting/reducing in visual and auditory evoked potentials
- 1988
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Ingår i: Personality and Individual Differences. - 0191-8869 .- 1873-3549. ; 9:3, s. 571-579
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Tidskriftsartikel (refereegranskat)abstract
- Previous studies have indicated a relationship between evoked potential augmenting/reducing and extraversion or sensation seeking. However, the proposed mechanism of protective inhibition can account for this fact only if the relationship generalizes across different modalities and response definitions. The present study was designed to test this, using six intensities of visual and six intensities of auditory stimuli along with the EPI and SSS questionnaires.For the visual stimuli, the slope of the P90-N120 amplitude at the vertex correlated significantly with both the extraversion and the disinhibition scales in the way that augmenting/reducing theory predicts. However, over the primary visual area, no component showed the same personality relationship as the vertex wave, and one early component showed the opposite. This result suggests that personality differences in VEPs may reflect different ways of allocating processing resources between primary and association areas, rather than a generalized tendency to inhibit strong stimuli. In the auditory modality, personality differences were not apparent in the amplitude slopes, possibly due to the confluence from primary and association areas in AEPs in the vertex lead. There was a general tendency for latencies to correalte positively with extraversion and disinhibition, in congruence with Eysenck's theory on the biological basis of extraversion.
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| 62. |
- Stenberg, Georg, 1947-
(författare)
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Subliminal perception
- 1995
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Ingår i: Åström, K., Engström, C., Marklund, K. (red), Nationalencyklopedin. - Höganäs : Bra böcker. ; , s. 392-
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 63. |
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| 64. |
- Thoresen, Christian, et al.
(författare)
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Frontotemporal hypoactivity during a reality monitoring paradigm is associated with delusions in patients with schizophrenia spectrum disorders
- 2014
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Ingår i: Cognitive Neuropsychiatry. - 1354-6805 .- 1464-0619. ; 19:2, s. 97-115
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Tidskriftsartikel (refereegranskat)abstract
- Introduction Impaired monitoring of internally generated information has been proposed to be one component in the development and maintenance of delusions. The present study investigated the neural correlates underlying the monitoring processes and whether they were associated with delusions. Methods Twenty healthy controls and 19 patients with schizophrenia spectrum disorders were administrated a reality monitoring paradigm during functional magnetic resonance imaging. During encoding participants were instructed to associate a statement with either a presented (viewed condition) or an imagined picture (imagined condition). During the monitoring session in the scanner, participants were presented with old and new statements and their task was to identify whether a given statement was associated with the viewed condition, imagined condition, or if it was new. Results Patients showed significantly reduced accuracy in the imagined condition with performance negatively associated with degree of delusions. This was accompanied with reduced activity in the left dorsolateral prefrontal cortex and left hippocampus in the patient group. The severity of delusions was negatively correlated with the blood-oxygenation-level dependent response in the left hippocampus. Conclusions The results suggest that weakened monitoring is associated with delusions in patients with schizophrenia spectrum disorder, and that this may be mediated by a frontotemporal dysfunction.
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| 65. |
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| 66. |
- Wendt, Peter E., et al.
(författare)
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Ethanol reduces asymmetry of visual rCBF responses
- 1994
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Ingår i: Journal of Cerebral Blood Flow and Metabolism. - 0271-678X .- 1559-7016. ; 14:6, s. 963-973
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Tidskriftsartikel (refereegranskat)abstract
- Visual regional CBF (rCBF) responses were measured in 10 healthy male subjects before and after an ethanol dose of 1 g/kg body weight. This dose induces well-established cerebral vasodilatation. However, significant bilateral occipital increases were found in both conditions. Apparently, the coupling between neuronal activity and rCBF is preserved following ethanol. The occipital and posterior parietal flow increases were, however, larger on the right than the left side in the sober state. During inebriation the asymmetry disappeared, possibly representing a more undifferentiated processing of visual information. We propose that ethanol causes a reduced inhibition of the left posterior cortex and a reduction of right-hemisphere information processing.
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| 67. |
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| 68. |
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| 69. |
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| 70. |
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