Publications by authors named "J Ivarsson Blechert"

Background: Regular physical activity (PA) provides numerous health benefits, which is why many people intend to lead an active lifestyle. Yet, internal and external states and barriers can hinder the translation of such intentions into actual behavior. This study prospectively studied such barriers, namely, the temporal relationship between the independent variables momentary affect (stress, emotions), and the dependent variables PA intentions and subsequent PA behavior.

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The approach-avoidance task (AAT) probes tendencies contributing to unwanted behaviours, like excessive snacking, by measuring RT differences between approach and avoidance responses to different stimuli. It retrains such tendencies using repeated avoidance of appetitive stimuli and approach of healthy alternatives. The most common paradigm, the irrelevant-feature AAT, conceals these stimulus-response contingencies by requiring approach or avoidance based on features irrelevant to the tendencies (e.

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While it has become standard practice to report the reliability of self-report scales, it remains uncommon to do the same for experimental paradigms. To facilitate this practice, we review old and new ways to compute reliability in reaction-time tasks, and we compare their accuracy using a simulation study. Highly inaccurate and negatively biased reliability estimates are obtained through the common practice of averaging sets of trials and submitting them to Cronbach's alpha.

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The tendency to approach food faster than to avoid it (i.e., approach bias) is thought to facilitate food intake, particularly foods that conflict with one's dietary goals.

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Fear of negative (FNE) and positive (FPE) evaluation constitute distinct components of social anxiety and relate to altered affectivity. It is unclear whether individuals with strong FNE/FPE overreact to social stressors only or to more unspecific ones as well. The present set of three studies (n = 109 and n = 97 healthy individuals in study 1/2, n = 49 patients with social anxiety disorder in study 3) assessed whether reactivity to various daily stressors and non-specific momentary stress/emotions assessed through ecological momentary assessment depend on individuals' level of FPE/FNE.

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