“…Although widely recognized and well researched, the problem of unreliability has thus far resisted resolution. Current conjecture is that place dependence is regulated by a broad range of factors, including (a) characteristics of the to-be-remembered or target events (Wilhite, 1991); (b) the manner in which they are encoded (McDaniel, Anderson, Einstein, & O'Halloran, 1989); (c) the nature of the retrieval test (Smith, Glenberg, & Bjork, 1978); (d) whether the events are construed as being causally related to, rather than simply contiguous with, a given environment (Fernandez & Glenberg, 1985); (e) whether the events are envisioned as interacting with the environment or as isolated visual images (Eich, 1985); (f) the ease with which participants, at retrieval, can mentally reinstate the original encoding context (Smith, 1979); and (g) the duration of the retention interval (Smith, 1988). Although clearly plausible and probably contributory, these factors provide only a partial understanding of why place dependence sometimes conies, sometimes goes.…”