hologram the image of an object in three dimensions created and reproduced by the use of lasers. Holography is a method for recording and reproducing such images. Holograms are remarkable in that, unlike normal photographs, every part of them contains the complete image but in reduced detail. Thus a small square cut from a hologram can still be laser-illuminated to reveal the whole scene originally holographed, albeit with loss of resolution. This feature made the hologram attractive to proponents of the thesis of distribution of function in the brain, who argued that memories are like holograms, not being located in a single precise engram – as claimed by advocates of localization of function – but distributed across perhaps all of the cortex. Although intriguing, the holographic model of memory storage failed to gain acceptance. Current views favor D. O. Hebb’s ‘cell assembly’ concept, in which memories are stored in the connections between a group of neurons. See also CONNECTIONISM , PERCEP- TIO. T.H.L.