The first systematic study investigating the effects of caffeine on human performance – sponsored by Coca-Cola – has been published about 100 years ago. Since then, thousands of other studies have been looking at if and in which ways caffeine improves cognitive performance. This question is still debated in science, but there is general consensus that caffeine can be seen as an enhancer for specific functions like mood, attention, concentration and reaction time. These enhancement effects have been shown in studies with the general set-up that participants first took caffeine and then did a performance task. This matches our everyday representation of “wise” caffeine use: if I wanted to enhance my performance with caffeine, I’d take it immediately before the “critical situation”, for example an exam.
By Brian Earp
The will is caused, not free
Everyone is talking about free will these days. Sam Harris has a new book out. Eric MacDonald has weighed in on that. Jerry Coyne, Paul Bloom, and some philosopher-types have a debate going on in the Chronicle of Higher Education. And way back in 2009 the Society for Personality and Social Psychology hosted a “showdown” between psychologists Roy Baumeister and John Bargh on the topic: What does the ‘free’ in ‘free will’ really mean? [A video of Bargh's half can be seen here. Baumeister is here.]
The SPSP conference led to a fiery exchange of blog posts between the two principles, and then to a more sedated pair of papers in the society’s newsletter, Dialogue. Baumeister enlisted Kathleen Vohs to co-author his piece, and Bargh (for some reason) enlisted me. Here is what Professor Bargh and I had to say – after this delightful FoxTrot comic by Bill Amend.