Using parametric regressors to disentangle properties of multi-feature processes |
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Authors: | Guilherme Wood Hans-Christoph Nuerk Denise Sturm Klaus Willmes |
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Institution: | 1. Behavioural & Clinical Neuroscience Institute, Department of Experimental Psychology, University of Cambridge, Downing Site, Cambridge, CB2 3EB, UK 2. Department of Addictive Behavior and Addiction Medicine, J5, Central Institute of Mental Health, 68159, Mannheim, Germany 3. NeuroImage Nord, Department of Systems Neuroscience, University Medical Centre Hamburg Eppendorf, Martinistr, 52, 20246, Hamburg, Germany 4. Section of Systems Neuroscience, Department of Psychiatry and Psychotherapy, Faculty of Medicine Carl Gustav Carus, Technische Universit?t Dresden, Dresden, Germany
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Abstract: | Background Existing brain imaging studies, investigating sexual arousal via the presentation of erotic pictures or film excerpts, have mainly used blocked designs with long stimulus presentation times. Methods To clarify how experimental functional magnetic resonance imaging (fMRI) design affects stimulus-induced brain activity, we compared brief event-related presentation of erotic vs. neutral stimuli with blocked presentation in 10 male volunteers. Results Brain activation differed depending on design type in only 10% of the voxels showing task related brain activity. Differences between blocked and event-related stimulus presentation were found in occipitotemporal and temporal regions (Brodmann Area (BA) 19, 37, 48), parietal areas (BA 7, 40) and areas in the frontal lobe (BA 6, 44). Conclusion Our results suggest that event-related designs might be a potential alternative when the core interest is the detection of networks associated with immediate processing of erotic stimuli. Additionally, blocked, compared to event-related, stimulus presentation allows the emergence and detection of non-specific secondary processes, such as sustained attention, motor imagery and inhibition of sexual arousal. |
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