A re-examination of the Stratton effect: Egocentric adaptation to a rotated visual image

The question raised by Stratton, whether a disoriented image can yield upright vision. was explored by exposing Os to a prismatically rotated field. To isolate the problem ofadaptation to altered egocentric orientation, the O’s view was restricted to a horizontal plane during both prism exposure and test. Significant adaptation based on movement-derived information was obtained.     

Tau as a potential control variable for visually guided braking

D. N. Lee (1976) described a braking strategy based on optical expansion in which the driver brakes so that the target's time-to-contact declines around a constant slope in the range -0.5 < or = tau < 0. The present results from a series of braking simulations confirm and extend earlier reports (E. H. Yilmaz & W. H. Warren, 1995) that performance is broadly compatible with the tau hypothesis. However, performance was not enhanced in situations that favored the estimation of tau, and unlike in earlier reports, performance deteriorated in the absence of a ground plane that provided information about speed and target distance. This finding suggests that the tau hypothesis does not provide a complete account of braking control.     

What are the Origins of Shamanic Journeying Imagery? The Modification of a Hypnoanalytic Technique to Address an Enduring Methodological Problem

Shamanic journeying imagery arguably transcends geographical space and historical time. However, to what extent is the content of the journeying imagery a construction of the shaman's cultural cosmology, belief systems, autobiographical memories, etc? It is suggested that attempts to answer this question are hampered by a fundamental methodological obstacle: how to detect contextual influences on imagery that the shaman cannot report on because they are outside his/her present awareness and memory. A partial solution is presented: Watkins' (1971) Watkins, J. G. 1971. The affect bridge: A hypnoanalytic technique.. The International Journal of Clinical and Experimental Hypnosis, 19: 21–27. [Taylor & Francis Online], [Web of Science ®] , [Google Scholar] Affect Bridge, a hypnoanalytic technique used to uncover the origin of an affect. A nonhypnotic version of the technique developed for inquiry into shamanic journeying imagery is then explicated. Two recent empirical studies conducted by Rock (2006) Rock, A. J. 2006. Phenomenological analysis of experimentally induced visual mental imagery associated with shamanic journeying to the lower world.. International Journal of Transpersonal Studies, 25: 45–55.  [Google Scholar] and Rock, Casey and Baynes (2006) Rock, A. J., Casey, P. J. and Baynes, P. B. 2006. Experimental study of ostensibly shamanic journeying imagery in naive participants II: Phenomenological mapping and modified affect bridge.. Anthropology of Consciousness, 17(1): 65–83. [Crossref] , [Google Scholar], illustrating the utility of the Modified Affect Bridge with regards to investigating experimentally the origin of ostensibly shamanic journeying imagery reported by naive participants, are summarized. A tentative ostensibly shamanic journeying imagery origin typology is formulated and suggestions for future research are advanced.