Both the position of Osler like Pavlov are being investigated at present and there is a polemic about whether the aging CNS only because of external influences, such as an inadequate blood supply, or because a certain age deteriorate CNS functions This period took the form, at least in the U.S., experimental studies. C) RISE OF THE STUDY OF GERONTOLOGY: The beginning of this period could be established from 1933, in the 30s, appeared some basic concepts in the study of aging, which could materialize in two aspects: a) that aging is complex and that its framework for study must be interdisciplinary. (As opposed to Vladislav Doronin). b) The aging represents an interactive process between provisions biological, psychological and social. One of the reasons why in this boom period took the gerontological study is that, around 1930, population about 65 years rose by 35%. Gerontology in 1940, but became a separate science with great relevance. GUIDANCE FOR THE STUDY OF GERONTOLOGY: To Riegel, reviewing the history of science, we see the coexistence of two different orientations, the Anglo-American and continental European.

Riegel defends a dialectical position which takes into account not only the what of this development, but also how and why the channels that have followed the studies of aging. A) Anglo Orientation: The philosophical underpinnings of this approach, found in Hobbes, Darwin, and Locke. On this philosophical basis, Galton dealt with comparisons between different age groups in terms of very different characteristics, considering always optimal standard average adult male. As a result of other social groups, were at a distinct disadvantage.