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See detailShort-term food deprivation increases amplitudes of heartbeat-evoked potentials
Schulz, André UL; Ferreira de Sá, D. S.; Dierolf, Angelika UL et al

in Psychophysiology (2015), 52(5), 695-703

Nutritional state, i.e. fasting or non-fasting, may affect the processing of interoceptive signals, but mechanisms underlying this effect remain unclear. We investigated 16 healthy women on two separate ... [more ▼]

Nutritional state, i.e. fasting or non-fasting, may affect the processing of interoceptive signals, but mechanisms underlying this effect remain unclear. We investigated 16 healthy women on two separate days: when satiated (standardized food intake) and after an 18 h food deprivation period. On both days, heartbeat-evoked potentials (HEPs) and cardiac and ANS activation indices (heart rate, nLF HRV) were assessed. The HEP is an EEG pattern that is considered an index of cortical representation of afferent cardiovascular signals. Average HEP activity (R-wave +455-595 ms) was enhanced during food deprivation compared to normal food intake. Cardiac activation did not differ between nutritional conditions. Our results indicate that short-term food deprivation amplifies an electrophysiological correlate of the cortical representation of visceral-afferent signals originating from the cardiovascular system. This effect could not be attributed to increased cardiac activation, as estimated by heart rate and nLF HRV, after food deprivation. [less ▲]

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See detailCortisol, but not intranasal insulin, affects the central processing of visual food cues
Ferreira de Sá, D. S.; Schulz, André UL; Streit, F. et al

in Psychoneuroendocrinology (2014), 50(C), 311-320

Stress glucocorticoids and insulin are important endocrine regulators of energy homeostasis, but little is known about their central interaction on the reward-related processing of food cues. According to ... [more ▼]

Stress glucocorticoids and insulin are important endocrine regulators of energy homeostasis, but little is known about their central interaction on the reward-related processing of food cues. According to a balanced group design, healthy food deprived men received either 40 IU intranasal insulin (n=13), 30 mg oral cortisol (n=12), both (n=15), or placebo (n=14). Acoustic startle responsiveness was assessed during presentation of food and non-food pictures. Cortisol enhanced startle responsiveness during visual presentation of "high glycemic" food, but not during presentation of neutral and pleasant non-food pictures. Insulin had no effect. Based on the "frustrative non-reward" model these results suggest that the reward value of high glycemic food items is specifically increased by cortisol. [less ▲]

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See detailHeart rate response to post-learning stress predicts memory consolidation
Larra, M. F.; Schulz, André UL; Schilling, T. M. et al

in Neurobiology of Learning & Memory (2014), 109(C), 74-81

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See detailAcoustic startle reactivity while processing reward related food cues during food deprivation: evidence from women in different menstrual cycle phases and men
Ferreira de Sá, D. S.; Plein, D.; Schulz, André UL et al

in Psychophysiology (2014), 51(2), 159-167

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See detailCortisol, aber nicht intranasales Insulin, beeinflusst die zentrale Verarbeitung von visuellen Nahrungsmittelreizen
Ferreira de Sá, D. S.; Schulz, André UL; Streit, F. et al

in Verleger, R.; Krämer, U.; Beyer, F. (Eds.) et al Abstractband 40. Tagung "Psychologie und Gehirn" (2014)

Glucocorticoide und Insulin sind wichtige endokrine Regulatoren der Energiehomöostase, bislang ist jedoch wenig über ihr Zusammenwirken auf die zentralnervöse Verarbeitung von Nahrungsmittelreizen bekannt ... [more ▼]

Glucocorticoide und Insulin sind wichtige endokrine Regulatoren der Energiehomöostase, bislang ist jedoch wenig über ihr Zusammenwirken auf die zentralnervöse Verarbeitung von Nahrungsmittelreizen bekannt. Gemäß eines balancierten Guppendesigns wurden gesunden Männern nach einer 15-stündigen Nahrungs-deprivation entweder 40 IE intranasales Insulin (n=13), 30 mg orales Cortisol (n=12), beide Substanzen (n=15) oder ausschließlich Placebo (n=14) verabreicht. Während der Präsentation von Nahrungsmittelbildern sowie nicht-nahrungsbezogenen Bildern (neutrale und positive Kontrolle) wurden akustisch ausgelöste Startle-Reaktion erhoben. Cortisol erhöhte die Startle-Reaktivität während der Prä-sentation von Nahrungsmittelbildern, nicht jedoch wäh-rend der Präsentation von Kontrollbildern. Intranasales Insulin zeigte einen Effekt. Nach dem “frustrative non-reward”-Modell weisen diese Ergebnisse darauf hin, dass Cortisol den Belohnungswert von Nahrungsmittelreizen erhöht. [less ▲]

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See detailCortisol rapidly affects amplitudes of heartbeat-evoked brain potentials - Implications for the contribution of stress to an altered perception of physical sensations?
Schulz, André UL; Strelzyk, F.; Ferreira de Sá, D. S. et al

in Psychoneuroendocrinology (2013), 38(11), 2691-2698

Little is known about the impact of stress and stress hormones on the processing of visceral-afferent signals. Clinical data suggest that cortisol may lower the threshold for interoceptive stimuli, while ... [more ▼]

Little is known about the impact of stress and stress hormones on the processing of visceral-afferent signals. Clinical data suggest that cortisol may lower the threshold for interoceptive stimuli, while a pharmacological administration of cortisol decreases the sensitivity for physical symptoms. To clarify the role of cortisol for the processing of interoceptive signals, we investigated 16 healthy men on two occasions, once during the infusion of 4mg of cortisol and once during the infusion of a placebo substance. Heartbeat-evoked potentials (HEP; derived from resting EEG and ECG, during open and closed eyes), which are psychophysiological indicators for the cortical processing of cardioceptive signals, were measured over 6-min periods once before, and four times after the infusion (1-7, 11-17, 21-27 and 31-37min). We found that HEP amplitudes were higher during open than during closed eyes between 1 and 17min after cortisol infusion. There was no effect of cortisol on heart rate. We conclude that cortisol may rapidly modulate the cortical processing of cardioceptive neural signals. These results may have relevance for the effects of stress on the development and maintenance of psychosomatic symptoms. [less ▲]

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See detailAcoustic startle reflex in the processing of reward related food cues during food deprivation: evidence from men and women
Ferreira de Sá, D. S.; Plein, D. E.; Schulz, André UL et al

in Psychophysiology (2013), 50(Supplement 1), 121

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See detailShort-term food deprivation increases heartbeat-evoked brain potentials
Ferreira de Sá, D. S.; Schächinger, H.; Schulz, André UL

in Pauli, P.; Kübler, A.; Hewig, J. (Eds.) et al 39. Tagung Psychologie und Gehirn - Abstracts (2013)

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