Abstract
It is well known that many kinds of unspecific stress produce changes in the function and the structure of various endocrine organs. In this connection »stressors« such as vitamin deficiency, infections, toxic substances, chemical or mechanical injuries etc. have been frequently investigated. As a rule, the stress has been reported to produce marked changes in various endocrine organs, and especially in the adrenals which seem to react to very slight stimuli. It has been reported that psychic stress may give rise to morphological and functional changes of the endocrine organs in experimental animals (Selye, 1950). Recently Näätänen & Jänkälä (1955) reported that stress in rats produced by brilliant flashes of ligt, loud modern dance music, exposure to a cat and frightening with pincers resulted in marked changes in the size and structure of the pituitary body and the adrenal gland. In these experiments, however, the rats were kept in a
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