perceptive hallucination

   Also known as hallucination of perception. Both are classic terms used to denote a hallucination that is embedded in sense impressions from the external environment. Near the end of the 19th century, perceptive hallucinations were thought to arise from a process in which memories were first shunted back to the senses via efferent nerve fibres, and then forward via afferent ones to the cerebral sensory cortex, together with sensory information. The German chemist Ludwig Stau-denmaier (1865-1933) suggested that in this way the sense organs facilitate the 'outward projection' or 'physical projection' of perceptual information into extracorporeal space. The Italian psychiatrist Eugenio Tanzi (1856-1934) was one of the first to describe this mechanism, referring to it as the * reversed conductibility ofthe sensory pathways. A contemporary hypothetical model that seeks to explain the mediation of perceptive hallucinations is the * perception and attention deficit model (PAD model).

   References

   Collerton, D., Perry, E., McKeith, I. (2005). Why people see things that are not there: A novel perception and attention deficit model for recurrent complex visual hallucinations. Behavioural and Brain Sciences, 28, 737-794. Schorsch, G. (1934). Zur Theorie der Halluzinationen. Leipzig: Verlag von Johann Ambrosius Barth.

   Tanzi, E. (1909). A text-book of mental diseases. Translated by Ford Robertson, W., Mackenzie, T.C. London: Rebman Limited.