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

@article{Pressner1977EffectOC,
  title={Effect of contingent and noncontingent feedback and subject expectancies on electroencephalogram biofeedback training.},
  author={J A Pressner and J C Savitsky},
  journal={Journal of consulting and clinical psychology},
  year={1977},
  volume={45 4},
  pages={713-4}
}