Externalization Errors of Olfactory Source Monitoring in Healthy Controls-An fMRI Study

Leclerc MP, Kellermann T, Freiherr J, Clemens B, Habel U, Regenbogen C (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Chemical Senses Oxford University Press

Book Volume: 44

Pages Range: 593-606

Journal Issue: 8

DOI: 10.1093/chemse/bjz055

Abstract

Using a combined approach of functional magnetic resonance imaging (fMRI) and noninvasive brain stimulation (transcranial direct current stimulation [tDCS]), the present study investigated source memory and its link to mental imagery in the olfactory domain, as well as in the auditory domain. Source memory refers to the knowledge of the origin of mental experiences, differentiating events that have occurred and memories of imagined events. Because of a confusion between internally generated and externally perceived information, patients that are prone to hallucinations show decreased source memory accuracy; also, vivid mental imagery can lead to similar results in healthy controls. We tested source memory following cathodal tDCS stimulation using a mental imagery task, which required participants to perceive or imagine a set of the same olfactory and auditory stimuli during fMRI. The supplementary motor area (SMA) is involved in mental imagery across different modalities and potentially linked to source memory. Therefore, we attempted to modulate participants' SMA activation before entering the scanner using tDCS to influence source memory accuracy in healthy participants. Our results showed the same source memory accuracy between the olfactory and auditory modalities with no effects of stimulation. Finally, we found SMA's subregions differentially involved in olfactory and auditory imagery, with activation of dorsal SMA correlated with auditory source memory.

Authors with CRIS profile

Jessica Freiherr Professur für Neurowissenschaften der sensorischen Wahrnehmung (Stiftungsprofessur)

Involved external institutions

Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen DE Germany (DE)

How to cite

APA:

Leclerc, M.P., Kellermann, T., Freiherr, J., Clemens, B., Habel, U., & Regenbogen, C. (2019). Externalization Errors of Olfactory Source Monitoring in Healthy Controls-An fMRI Study. Chemical Senses, 44(8), 593-606. https://doi.org/10.1093/chemse/bjz055

MLA:

Leclerc, Marcel P., et al. "Externalization Errors of Olfactory Source Monitoring in Healthy Controls-An fMRI Study." Chemical Senses 44.8 (2019): 593-606.

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