David Haas

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Rodent studies suggest that prefrontal dopamine neurotransmission plays an important role in the neural processing of psychosocial stress. Human studies investigating stress-induced changes in dopamine levels, however, have focused solely on striatal dopamine transmission. The aim of this study was to investigate in vivo dopamine release in the human(More)
OBJECTIVE Patients diagnosed with a psychotic disorder and their first-degree relatives display increased reactivity to stress. Theory predicts that experience of psychosocial stress is associated both with ventromedial prefrontal and mesolimbic dopamine neurotransmission. However, while there is evidence of aberrant striatal dopamine processing in(More)
Elementary school science focuses on the early phases of science inquiry: observation, description, data collection, reflection, and reporting. Technologies afford opportunities to scaffold and extend the domains of inquiry, but successful adoption depends on their integration with classroom organization and practice. In elementary schools, small group and(More)
This paper explores the process of adaptation to new methods in a simple model where the growth rate of labour supply is exogenously given and constant. It shows that competition for a primary input in short supply changes the mechanism of adaptation and its consequences: If surplus labour exists, differential capacity accumulation effectuates adaptation(More)
Third- and sixth-grade students used a graphical simulation of the honeybee dance presented on a plasma panel deployed for several weeks in the corner of their classrooms. Among third graders, acceptance was hindered by discrepancies between the representation of phenomena in the simulation and students' prior knowledge of those phenomena. Sixth graders(More)
OBJECTIVE To determine the physical compatibility of propofol injection with 77 other drug products using two methods not previously reported. DESIGN Each of 77 drug products were mixed with (1) an equal volume of propofol injection, (2) an equal volume of propofol injection with methylene blue added, and (3) an equal volume of the separated aqueous phase(More)