Using seminar blogs to enhance student participation and learning in public health school classes.

OBJECTIVES: We evaluated whether "seminar blogs" enhanced learning in a large graduate-level introductory public health school class. METHODS: Sixty students were divided into 6 online blog groups. Students posted their assignments (case analyses, news commentaries), prompting comments from other students. Anonymous poll surveys of students were conducted at midpoint and at the end of the course. RESULTS: Sixty percent reported that blog participation enriched their learning quite a bit, 34% a small amount, and 6% not at all; 54% said that the blogs provided opportunities to learn from classmates. When comparing writing on the blog to speaking in class, 60% found it easier, 30% about the same, and 10% harder. About 65% said that skills attained by participating in blogs were useful for current or future work. Major criticisms involved time issues. CONCLUSIONS: Small seminar blogs offer opportunities for increased student participation, interaction, and learning. To be most effective and appealing, assignments for postings need to allow sufficient time for commentary. This educational technology has potential to expand the classroom experience and is worthy of further development and testing.

Decreased absolute amygdala volume in cocaine addicts.

The amygdala is instrumental to a set of brain processes that lead to cocaine consumption, including those that mediate reward and drug craving. This study examined the volumes of the amygdala and hippocampus in cocaine-addicted subjects and matched healthy controls and determined that the amygdala but not the hippocampus was significantly reduced in volume. The right-left amygdala asymmetry in control subjects was absent in the cocaine addicts. Topological analysis of amygdala isosurfaces (population averages) revealed that the isosurface of the cocaine-dependent group undercut the anterior and superior surfaces of the control group, implicating a difference in the corticomedial and basolateral nuclei. In cocaine addicts, amygdala volume did not correlate with any measure of cocaine use. The amygdala symmetry coefficient did correlate with baseline but not cocaine-primed craving. These findings argue for a condition that predisposes the individual to cocaine dependence by affecting the amygdala, or a primary event early in the course of cocaine use.