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...

Functional MRI (fMRI) is well-established for the study of brain function in healthy populations, although its clinical application has proven more challenging. Specifically, cerebrovascular reactivity (CVR), which allows the assessment of the vascular response that serves as the basis for fMRI, has been shown to be reduced in healthy aging as well as in a range of diseases, including chronic s...

Pain is a complex sensation influenced by many psychological, relational and socialfactors. Perception and / or painful expression may be wrong in the case of certain chronic diseases such as schizophrenia. In this work we report the cases of two patients with schizophrenia who presented during their hospitalization, abnormal reactivity to pain, to better approach the sensitivity to pain during...

Titania films were grown on BaTiO3 (BTO) substrates by pulsed laser deposition to create (001)Anatase||(100)BTO, (100)Rutile||(111)BTO, and (110)Rutile||(110)BTO heterostructures. The photochemical reactivity was evaluated by observing the amount of silver reduced by each film under identical conditions. The thickest films (100 nm) had reactivities that varied with the phase of titania and the ...

Cue reactivity and craving can be influenced by cue exposure with response prevention (CERP). This study investigated the neural correlates of CERP using functional magnetic resonance imaging, while participants smelled chocolate (17 participants) or a control object (17 participants). CERP was interrupted by 7 scanning sequences measuring the brain response to neutral and chocolate pictures. C...

Blood oxygenation level-dependent (BOLD) contrast functional magnetic resonance imaging (fMRI) is a widely used technique to map brain function, and to monitor its recovery after stroke. Since stroke has a vascular etiology, the neurovascular coupling between cerebral blood flow and neural activity may be altered, resulting in uncertainties when interpreting longitudinal BOLD signal changes. Th...