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This book, which covers Visions and hallucinations, explains what causes them and summarises how many hallucinations have been caused by each event or activity. It also provides specific help with questions people have asked us, such as ‘Is my medication giving me hallucinations?’.

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Foster and Kreitzman - Seasons of Life - Dark eyed juncos



Type of Spiritual Experience


Several examples of no physical input - no input to the 5 senses, but function triggered nonetheless, wich means there is a functional trigger - system to system, not hardware to hardware.

A description of the experience

Seasons of Life – Russell G Foster and Leon Kreitzman

Rowan considered environmental cues such as temperature and food availability, but concluded that only the change in daylength could provide such precision.  He tested this hypothesis by capturing dark eyed juncos.  These juncos breed in Canada and overwinter further south, and Rowan caught them during the autumn migration.  The birds were kept in sheds and exposed to artificial spring like day-lengths.  Despite the sub-zero temperatures of the Canadian winter, the birds could be triggered to breed by the artificially long days……..

Farmers and animal breeders have known about the effects of daylength for centuries.  More than 200 years ago, Spanish farmers were providing artificial illumination at night to increase the egg production of chickens….

Baker… found that in … tropical areas, breeding may occur in almost any month, but each species had its own period.  For instance, in spite of the extremely uniform conditions, the breeding season of permanently cave living bats in the New Hebrides was confined to a few weeks in early September (early spring at that latitude)……

The changing daylength is used to time reproduction in a vast number of species, but the precise daylength selected varies greatly.

The source of the experience

Foster and Kreitzmann

Concepts, symbols and science items


Science Items

Activities and commonsteps