These interaction theories have been labeled contagion and convergence theories, respectively the former stressing the contagious spread of mood and behaviour; the latter stressing the convergence of a large number of people with similar predispositions.
The 'convergence' theory proposes that shared motivations cause individuals with similar predispositions, attitudes and personality traits to 'converge' and thus to fuel one another's behaviours (Turner & Killian, 1987).
Furthermore, similar genetic predisposition is shared by these two diseases.
A constant rate for female family members would suggest a similar accumulated predisposition for the disease at a particular unique family-specific age.
However, one can argue that MS like pathology is only seen in patients, who have a similar genetic predisposition compared to MS patients [ 20, 25], or who have been exposed to similar environmental challenges.
Although the two groups presumably shared a similar genetic predisposition to myopia, their measured prevalence of this condition contrasted sharply: 3.3% among those living in Sydney versus 29.1% for those in Singapore.
18 Family history of a first-degree relative with melanoma doubles the melanoma risk; however, this may be attributed to similar genetic predisposition, environmental sun exposure, and skin characteristics (pigment, number of nevi, and sunburn predication).
Children born in developing countries who migrate to the UK at early ages are likely to have a similar genetic predisposition to asthma to children of the same ethnicity born in the UK.
Recently the MYH 9 gene has been identified as a marker for more rapid progression to ESKD in Black patients [ 31, 32] due to non-diabetic kidney disease and it is possible that a similar genetic predisposition to more rapid progression even in the face of a relatively low blood pressure exists in the South Asian population but this hypothesis requires further study.
However, we suggest that it is unlikely that the apes' behaviour was based on a similar instinctual predisposition to recover hidden caches or reject frozen juice after longer RI since none of the aspects is part of the ecology where apes evolved.
