The relevance of the functional 5-HT1A receptor polymorphism for attention and working memory processes during mental rotation of characters |
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Authors: | Christian Beste Martin Heil Carsten Konrad |
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Affiliation: | a Institute for Cognitive Neuroscience, Department of Biopsychology, Ruhr-Universität Bochum, Universitätsstraße 150, D-44780 Bochum, Germany b Department of Experimental Psychology, Heinrich-Heine-University, Düsseldorf, Germany c Department of Psychiatry and Psychotherapy, University of Münster, Germany d Interdisciplinary Center for Clinical Research (IZKF), University of Münster, Germany e Department of Psychiatry and Psychotherapy, University of Marburg, Germany |
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Abstract: | Numerous lines of research indicate that attentional processes, working memory and saccadic processes are highly interrelated. In the current study, we examine the relation between these processes with respect to their cognitive-neurophysiological and neurobiological background by means of event-related potentials (ERPs) in a sample of N = 72 healthy probands characterized for the functional serotonin receptor 1 A (5-HT1A) C(−1019)G polymorphism.The results support a close interrelation between working memory, attentional and saccadic processes. Yet, these processes are differentially modulated by the 5-HT1A C(−1019)G polymorphism. The 5-HT1A C(−1019)G polymorphism primarily affects attentional processing, whereas processes related to the mental rotation of an object are independent of 5-HT1A genetic variation. It is shown that an increasing number of −1019 G alleles leads to a differential reduction of the N1 above the left and right hemisphere and hence bottom-up attentional processing. In the way increasing numbers of −1019 G alleles lead to a reduction of attentional processes, saccadic activity increases as a similar function of the number of −1019 G alleles. This increase in activity occurs parallel in time to the process of mental rotation. It is hypothesized that decreased attentional processes, dependent on different 5-HT1A C(−1019)G genotypes, may cause parietal networks to increase saccadic activity in order to perform mental rotation. |
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Keywords: | Mental rotation Serotonin Attention Event-related potentials (ERPs) Imaging genetics |
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