Key proponents of this notion have included Ellen Churchill Semple, Ellsworth Huntington, Thomas Griffith Taylor and possibly Jared Diamond, although his status as an environmental determinist is debated. Determinism and prediction
Other deterministic theories actually seek only to highlight the importance of a particular factor in predicting the future. These theories often use the factor as a sort of guide or constraint on the future. They need not suppose that complete knowledge of that one factor would allow us to make perfect predictions. Psychological determinism can mean that humans must act according to reason, but it can also be synonymous with some sort of psychological egoism. The latter is the view that humans will always act according to their perceived best interest. Linguistic determinism proposes that language determines (or at least limits) the things that humans can think and say and thus know. The Sapir–Whorf hypothesis argues that individuals experience the world based on the grammatical structures they habitually use. Economic determinism attributes primacy to economic structure over politics in the development of human history. It is associated with the dialectical materialism of Karl Marx. Technological determinism is the theory that a societys technology drives the development of its social structure and cultural values. Structural determinism
Structural determinism is the philosophical view that actions, events, and processes are predicated on and determined by structural factors. Given any particular structure or set of estimable components, it is a concept that emphasizes rational and predictable outcomes.
Screening
Prenatal screening is not typically done for FHM, but it may be performed if requested. As penetrance is high, individuals found to carry mutations should be expected to develop signs of FHM at some point in life. Management
See the equivalent section in the main migraine article. People with FHM are encouraged to avoid activities that may trigger their attacks. Minor head trauma is a common attack precipitant, so FHM sufferers should avoid contact sports. Acetazolamide or standard drugs are often used to treat attacks, though those leading to vasoconstriction should be avoided due to the risk of stroke. Epidemiology
Migraine itself is a very common disorder, occurring in 15–20% of the population. Hemiplegic migraine, be it familial or spontaneous, is less prevalent, at 0.01% prevalence according to one report. Women are three times more likely to be affected than males. See also
Channelopathy
Childhood absence epilepsy
Hypokalemic periodic paralysis
Juvenile myoclonic epilepsy
Malignant hyperthermia
Timothy syndrome

References
External links
GeneReviews/NCBI/NIH/UW entry on Familial Hemiplegic Migraine
"The International Classification of Headache Disorders 2nd Edition". Cephalalgia. 24 (s1): 8–160. May 2004. ISSN 1468-2982.