In October of 2002, Patricia A. Helvenston and Paul G. Bahn published a paper entitled ‘Desperately Seeking Trance Plants: Testing the “Three Stages of Trance” Model’. That paper presented a critique of the ‘Three Stages of Trance’ model as proposed by J.D. Lewis-Williams and T.A. Dowson in 1988 to account for mental imagery as perceived by people in ‘certain altered states of consciousness’ that they believed inspired Palaeolithic cave art. Helvenston & Bahn chose to publish their paper privately, but supplied the following summary of their argument. It is accompanied here by comments from a neuropsychologist (John L. Bradshaw) and a rock-art specialist (Christopher Chippindale).