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The importance of appropriate handling of artifacts in interbeat interval (IBI) data must not be underestimated. Even a single artifact may cause unreliable heart rate variability (HRV) results. Thus, a robust artifact detection algorithm and the option for manual intervention by the researcher form key components for confident HRV analysis. Here, we present ARTiiFACT, a software tool for processing electrocardiogram and IBI data. Both automated and manual artifact detection and correction are available in a graphical user interface. In addition, ARTiiFACT includes time-and frequency-based HRV analyses and descriptive statistics, thus offering the basic tools for HRV analysis. Notably, all program steps can be executed separately and allow for data export, thus offering high flexibility and interoperability with a whole range of applications.

Afferent neural signals are continuously transmitted from visceral organs to the brain. Interoception refers to the processing of visceral-afferent neural signals by the central nervous system, which can finally result in the conscious perception of bodily processes. Interoception can, therefore, be described as a prominent example of information processing on the ascending branch of the brain–body axis. Stress responses involve a complex neuro-behavioral cascade, which is elicited when the organism is confronted with a potentially harmful stimulus. As this stress cascade comprises a range of neural and endocrine pathways, stress can be conceptualized as a communication process on the descending branch of the brain–body axis. Interoception and stress are, therefore, associated via the bi-directional transmission of information on the brain–body axis. It could be argued that excessive and/or enduring activation (e.g., by acute or chronic stress) of neural circuits, which are responsible for successful communication on the brain–body axis, induces malfunction and dysregulation of these information processes. As a consequence, interoceptive signal processing may be altered, resulting in physical symptoms contributing to the development and/or maintenance of body-related mental disorders, which are associated with stress. In the current paper, we summarize findings on psychobiological processes underlying acute and chronic stress and their interaction with interoception. While focusing on the role of the physiological stress axes (hypothalamic-pituitary-adrenocortical axis and autonomic nervous system), psychological factors in acute and chronic stress are also discussed. We propose a positive feedback model involving stress (in particular early life or chronic stress, as well as major adverse events), the dysregulation of physiological stress axes, altered perception of bodily sensations, and the generation of physical symptoms, which may in turn facilitate stress.

Zusammenfassung. Impulsivität ist ein Persönlichkeitsmerkmal, das mit schnellen, unüberlegten Handlungen ohne Beachtung möglicher negativer Konsequenzen einhergeht. Eines der am weitesten verbreiteten Verfahren zur Erfassung von Impulsivität ist die Barratt Impulsiveness Scale (BIS-11; Patton, Stanford & Barratt, 1995 ). Es wurde gezeigt, dass die drei Faktoren nicht-planende, motorische und aufmerksamkeitsbasierte Impulsivität auch ausreichend gut mit einer verkürzten Form der BIS-11 erfasst werden können (BIS-15; Spinella, 2007 ). Die vorliegende Arbeit stellt diese Kurzversion der BIS-11 in einer deutschen Übersetzung vor. Reliabilität und Faktorstruktur des Fragebogens wurden in einer Stichprobe (N = 752) von überwiegend Studierenden getestet. Die dreifaktorielle Struktur von Spinella (2007) konnte bestätigt werden. Die interne Konsistenz war gut (Cronbachs α = .81). In einer zweiten Studie (N = 51) zeigte sich konvergente Validität durch Zusammenhänge mit einem anderen Impulsivitätsmaß (UPPS). Die BIS-15 empfiehlt sich durch ihre guten psychometrischen Kennwerte und ihre ökonomische Durchführbarkeit für die Erfassung von Impulsivität im deutschen Sprachraum.