The Association for Applied Psychophysiology and Biofeedback (AAPB) has several components, and it encourages diversity of development of knowledge in an array of physiological and psychophysiological fields. The Biofeedback magazine is a focus of expression of the different components of the biofeedback science. This issue comprises different aspects of development of biofeedback in time.

Heart rate variability (HRV) is the latest fashion of interest in the biofeedback world. Leah Lagos presents a report of the relationship between postconcussion syndrome and healing of the autonomic nervous system (ANS) and HRV. The subject of ANS and disease is only in the incipient developmental phase in medicine and psychophysiology, and this article is a real eye opener to clinicians and scientists alike.

Conditioning and learning are old subjects in need of further development. As a student of Donald Hebb back at McGill University in Montreal in the 60s, I was well aware of...

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