The regression hypothesis, first formulated by Roman Jakobson in 1941, goes back to the beginnings of psychology and psychoanalysis. Generally speaking, it states that that which was learned first will be retained last, both in 'normal' processes of forgetting and in pathological conditions such as aphasia or dementia. As a template for language forgetting, the regression hypothesis has long seemed an attractive paradigm. However, as Keijzer (2007) points out, regression is not in itself a theoretical or explanatory framework. Both order of acquisition and order of attrition need to be put into the larger context of linguistic theory in order to gain explanatory adequacy.

प्रतिगमन गृहीत-कल्पना The regression hypothesis (last thing learned, first thing lost)
L2
वय परिणाम The age effect
L1