The Sympathetic Nervous System and the Regulation of Cerebral Blood Flow in Man • Pharmacological blockade of the a adrenergic system by 20 mg phentolamine I.V. was shown not to influence CBF in 14 patients with an intact cerebral autoregulation. If the autoregulation—tested with angiotensin—was impaired for some reason, CBF was found to follow proportionally the blood pressure changes provoked...

Work ability of elderly managers may decrease probably due to a decreased cognitive flexibility. Moreover, cardiovascular reactivity to changing task demands might be less efficient in elderly. Younger (36-45 years) and elderly (49-60 years) German managers had to perform a switching task when they had to switch continuously between different rules of information processing or to use the same r...

Neurobiological models of obesity postulate that obese individuals have difficulty regulating food intake partly because they attribute excessive salience to stimuli signaling food availability. Typically, human studies that investigate the relationship between brain responses to food-related stimuli and obesity present food cues without subsequent delivery of food. However, in order to identif...

Global ecosystem models may require microbial components to accurately predict feedbacks between climate warming and soil decomposition, but it is unclear what parameters and levels of complexity are ideal for scaling up to the globe. Here we conducted a model comparison using a conventional model with first-order decay and three microbial models of increasing complexity that simulate shortto l...

To better understand the relationship between mindfulness and depression, we studied normal young adults (n=27) who completed measures of dispositional mindfulness and depressive symptomatology, which were then correlated with: a) Rest: resting neural activity during passive viewing of a fixation cross, relative to a simple goal-directed task (shapematching); and b) Reactivity: neural reactivit...

The Sympathetic Nervous System and the Regulation of Cerebral Blood Flow in Man • Pharmacological blockade of the a adrenergic system by 20 mg phentolamine I.V. was shown not to influence CBF in 14 patients with an intact cerebral autoregulation. If the autoregulation—tested with angiotensin—was impaired for some reason, CBF was found to follow proportionally the blood pressure changes provoked...

Mapping cerebrovascular reactivity (CVR) to hypercapnia is important both clinically and for improved understanding of the haemodynamic properties of the BOLD effect. In this work, BOLD/R2 CVR was investigated by using a device which provided small, repeatable and stable steps in PETCO2, whilst maintaining a steady PETO2 level. Significant CVR was observed in both grey and white matter at both ...

Emotional responses (Physiology, self-report, and facial expression) of 12 depressed and 10 nondepressed Spanish-speaking Latinas during sad and amusing film clips of human and animal content were compared. Depressed Latinas demonstrated less electrodermal reactivity across all the film clips and displayed fewer social smiles during the amusing-human film clip than nondepressed Latinas. No diff...

anisms of the animals in which the neoplasms originate. Al most all of the putatively nonviral tumors are individually specific and few, if any, cross-reactions occur among them. The antigenic titer varies greatly and is related to the latent period and the immunologie reactivity of the tumor host. This rela tionship is almost certainly due to immunoselection. The an tigens are found in early p...