A recent study in China found that alpha neurofeedback training improves visual working memory. The group that received this training improved both the capacity and accuracy of their visual working memory compared to the group that underwent sham training. The paper was published in npj Science of Learning.
Biofeedback training is a therapeutic technique that uses real-time monitoring of physiological functions, such as heart rate, muscle tension, and brainwave activity, to help individuals learn to control these processes consciously. The idea behind biofeedback is that if constant and accurate information is provided to an individual about their heart rate or brainwave activity, they will be able to identify actions that affect these processes and, through that, learn to control them. This technique is generally applied to bodily processes that humans cannot easily monitor using their consciously available senses.