Summary
Assuming a particular psychological function of optical gestalt perception, its impairment would lead to a decreasing extent of gestalt related optical illusion. An increase of optical illusion would be expected in the case of a loss of adaptability and cognitive compensation, usually revising the phenomenon of optical illusion. 16 demented out-patients were compared to 16 hospitalized schizophrenics by a ‘Computerized Assessment of Change in Optical Illusion’ (CACOI), measuring the extent of optical illusion by patient’s assessment of 12 variations of the figure of Mueller-Lyer, differing in baseline length. The results showed a significant increase of optical illusion in demented patients compared to the schizophrenic controls (p = 0.019). Taking into account that the extent of optical illusion by the figure of Mueller-Lyer usually is decreasing with age and was found to be increased in schizophrenics, our results support the hypothesis of an early loss of adaptability and cognitive compensation in dementia.
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© 1998 Springer-Verlag/Wien
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Weber, B., Frölich, L., Helbing, N., Simminger, D., Fritze, J., Maurer, K. (1998). Increase of optical illusion in demented patients. In: Gertz, HJ., Arendt, T. (eds) Alzheimer’s Disease — From Basic Research to Clinical Applications. Journal of Neural Transmission. Supplementa, vol 54. Springer, Vienna. https://doi.org/10.1007/978-3-7091-7508-8_6
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DOI: https://doi.org/10.1007/978-3-7091-7508-8_6
Publisher Name: Springer, Vienna
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