Is Caffeine a Cognitive Enhancer? (PDF) — Two general mechanisms may account for most of the observed effects of caffeine on performance: (1) an indirect, non-specific ‘arousal’ or ‘processing resources’ factor, presumably explaining why the effects of caffeine are generally most pronounced when task performance is sustained or degraded under suboptimal conditions; and (2) a more direct and specific ‘perceptual-motor’ speed or efficiency factor that may explain why, under optimal conditions, some aspects of human performance and information processing, in particular those related to sensation, perception, motor preparation, and execution, are more sensitive to caffeine effects than those related to cognition, memory, and learning. See also Smith 2005‘s caffeine led to a more positive mood and improved performance on a number of tasks. Different effects of caffeine were seen depending on the person’s level of arousal. Linear effects of caffeine dose were also observed. This is evidence against the argument that behavioral changes due to caffeine are merely the reversal of negative effects of a long period of caffeine abstinence. (via cogsci.stackexchange.com)
On Stars and Thinking Things Through (Courtney Johnston) — Matt (to my eyes, anyway) doesn’t have a singular ‘thing’: he has this kind of spangly web of interests and skills that coalesces around a line of enquiry and results in the making or doing of a thing, and these things in turn become part of that web and generate further experiments and thinking. Seconded.
Human-like Robot — and just like a real woman, the first paragraphs about the robot focus on soft skin and flowing brunette hair not how well she does her job. Progress!