EEG-Driven Photic Stimulation Effect on Plasma Cortisol and β-Endorphin

Hiroaki Kumano*, Harumi Horie, Tomifusa Kuboki, Hiroyuki Suematsu, Hiroshi Sato, Mitsuo Yasushi, Tsutomu Kamei, Sumio Masumura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The effect of EEG-driven photic stimulation on stress-related endocrine function was studied. Subjects were 16 healthy males divided into a photic stimulation group (n=8) and a control group (n=8). Electrodermal and emotional lability measures were assessed by nonspecific skin conductance response and the Maudsley Personality Inventory, respectively. Plasma cortisol and β-endorphin concentrations were measured both before and after EEG-driven photic stimulation as well as the resting condition. Subjects with electrodermal, emotional, or both lability showed comparable decreases of plasma β-endorphin on photic stimulation as did the stable subjects. Under resting control conditions, however, they showed significant increases of β-endorphin compared to both stable subjects as well as the photic stimulation condition. In addition, labile subjects showed significant alpha enhancement on photic stimulation compared to stable subjects and to the resting control condition. The data suggest that increases of plasma β-endorphin in labile control subjects may denote a stress response to the conditions of these experiments, and that any decrease by EEG-driven photic stimulation may indicate a reduction of responsiveness to an acute stress.

Original languageEnglish
Pages (from-to)193-208
Number of pages16
JournalApplied Psychophysiology Biofeedback
Issue number3
Publication statusPublished - 1997
Externally publishedYes


  • Alpha rhythm
  • Cortisol
  • EEG-driven photic stimulation
  • Stress
  • β-endorphin

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Applied Psychology


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