Association between discontinuous cranial traits

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Abstract
The associations of discontinuous variants (accessory ossicles, parietal foramina, and fronto‐temporal articulation) at seven circumparietal sites were tested by deriving chi‐squares and contingency coefficients for each pair of sites in 366 crania (N=732 sides) of the Morton collection, divided into six geographic racial subsamples. Seventy‐four of 85 race specific coefficients were positive and 25 of these were significant at the 0.05 level, while 11 of the 15 total sample coefficients were significant at the 0.01 level. Considerable racial variation was exhibited in the number and pattern of associations. Associations between adjacent sites were higher than those between non‐adjacent sites. This neighborhood pattern of associations is discussed with reference to a model in which many of the factors which produce these discontinuous variants operate on a regional scope, encompassing several neighboring sites, with overlapping of the regions affected by different factors.

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