Effect of contingent and noncontingent feedback and subject expectancies on electoencephalogram biofeedback training.

80 undergraduates either received auditory feedback contingent on their production of alpha or they received noncontingent feedback. In addition, Ss were led to expect either a positive or a negative experience. Ss who received contingent feedback produced significantly more alpha than Ss who received noncontingent feedback, but the type of feedback did not seem related to mood. Instead, Ss led to expect a positive experience reported significant reductions in anxiety. (PsycINFO Database Record (c) 2010 APA, all rights reserved)