Kayak angst, also known as in the
Greenlandic language, has been described since the 1960s and was initially noted as an issue faced by hunters out alone on a calm sea or lake, especially with the sun directly overhead or
shining directly into their eyes. Episodes often occur in
foggy or
overcast conditions as the sky is reflected on the still, mirror-like water surface, making it difficult to distinguish the horizon and determine up from down. In other circumstances, a number of hunters observed in early studies also reported to be equally affected in rough-weather conditions, such as storm or wind. 'Kayak hunter' in the East Greenlandic dialect is synonymous with 'man' and was considered a rigorous but sought after medical and physical test of one's abilities; Kayak angst was said to be experienced by an estimated 10–20% of these seal hunters, although it had no provable cause or cure. Speculation as to why the condition developed have ranged widely, from a possible hereditary defect among the people of Greenland to a form of
post-traumatic stress syndrome caused by the constant life-and-death trials involved in solo seal hunting. No satisfactory reasoning from such disparate ideas have been reached within the research community. ==Symptoms==