Spatial gating effects on judged motion of gratings in apertures.

Wallach has described in qualitative terms the movement of lines behind apertures. We related the data he obtained to the aperture problem, constructed a model of movement perception, and carried out tests of the model. Experiment 1 was a parametric study, and showed the conditions under which a reliable illusion (the barber pole illusion) of diagonal movement of lines along an aperture could be obtained, and when fluctuating judgements or veridical percepts were obtained. On the basis of this study a dipole model was constructed. The model was further developed and tested. In experiment 2 the effects of total area of stimulation were examined: diagonal gratings were viewed behind multiple apertures. In experiment 3 the effects of local signs were examined: diagonal gratings were viewed in an aperture which had edges cut in small steps and stairs, with the risers parallel to the grating, and the treads parallel to the direction of motion of the grating. Experiment 4 was designed to test a prediction about the motion aftereffect of dots near and far from the point of fixation, and the results confirmed the model. It was concluded that the model accounts for the barber pole illusion and, generally, for the movement of gratings in apertures.     

The use of the analyst as an autistic shape

In this paper I describe through detailed clinical material the challenges posed by patients who employ entangled autistic defenses. I discuss the complicated nature of treating a patient who employed entangled autistic defenses and utilized my voice in an effort to preserve an undifferentiated state of dual unity. My patient's pursuit of dual unity took a very concrete form in her attempt to mitigate the terror of separateness. This concreteness was expressed via the patient's urgent request that I read letters she wrote to me between sessions. This type of autistic defense placed great strain on my ability to think analytically and I also became increasingly concrete in my response to the patient. Crucial to the analyst's regaining a space in which to think and a sense of separateness is the ability to contact the ground floor of her separate bodily experience. This is just the beginning step in the analyst separating herself from the powerful press to join the patient in a state of dual unity. Interpretation in action (Ogden, 1994) was an effective way to convey the importance of creating and tolerating internal space in myself and begin to create internal space in the patient. Previously such space had been closed down in order to manage primitive fears of annihilation. When a patient is absorbed in an entangling autistic retreat words do not reach the patient on a symbolic level but rather are experienced primarily as an assault on the need for dual unity with the analyst. The patient's need to be wrapped in a sensation based world of dual unity is preferable to a world of spoken words that carry the danger of delineating psychic separateness. In essence there is no self to speak words, only a whirl of an amorphous sensation self lacking definition. I believe with certain kinds of patients it may be necessary to first lose and then work to regain one's analytic mind, as I have powerfully described in the case of Linda. Linda's profound loss of connection to the ground floor of her experience could only begin to be addressed when I worked to extricate myself from ‘our magic carpet ride’ of dual unity, contacting the reality of my bodily experience, and begin to tolerate the terror I felt regarding my separateness from Linda. I also describe the confusing vacillation between entangled and encapsulated defenses in patients like Linda as previously identified by Cohen and Jay (1996). Ultimately, this kind of slow difficult analytic work began to help Linda develop a capacity to think and provided an alternative to the deadened world of her autistic protections.     

Book reviews

Horowitz, M. J. (Ed.) (1988). Psychodynamics and cognition. Chicago: University of Chicago press. Pp. 389. ISBN 0226-35368-0. £ 21.95

Ellis A. W. & Young, A. W. (1988). Human cognitive neuropsychology. Hove: Lawrencve erlbaum Associates Ltd. Pp. 358. ISBN 0-86377-033-9, £ 21.95 9 (hardback), 0-86377-034-7, £ 11.95 (paperback).

Humphreys, G. W., & Bruce, V.(1989). Visual cognition: Computational, experimental and neuropsychological perspectives. Hove & London: Lawrence Erlbaum Associates Ltd. Pp. 330. ISBN 0-86277-124-6, £ 19.95 (hardback), 0-86377-125-4, £ 9.95 (paperback)