The Quantitative Measurement of Explicit and Implicit Memory and its Application to an Aging Population.
Abstract: A new model was developed to measure separately the influence of the
fundamental memory states of explicit memory, implicit memory, fractional storage and
non-storage, called the Implicit Explicit Separation (IES) model. The IES was used in five
experiments to analyze the dynamics of the fundamental memory types over various retention
intervals in younger and older adults. The storag... read moree values from the IES model were fit to an
existing memory model, the Two-Trace Hazard Model, which estimates the rate of memory loss
in the retention interval. The results indicate that explicit memory degrades at a rate
faster than implicit memory in younger adults. While explicit memory degrades at a similar
rate in older adults as younger adults, implicit memory rises in the short term, and then
remains stable in older adults. The rate parameters in the Two-Trace Hazard Model indicate
that memory loss in older adults is much faster in the seconds immediately following item
presentation than younger adults. Finally, in younger adults, very short term implicit
memory increases to a point and then decreases across the retention interval, indicating
that implicit storage is rising as a direct result of the degrading explicit storage
system, supporting a single-memory system. Further, when these data are analyzed through a
hazard function analysis, the conjunction of the two memory traces was peaked-shaped
supporting the basis of the Two-Trace Hazard Model.
Thesis (Ph.D.)--Tufts University, 2012.
Submitted to the Dept. of Psychology.
Advisor: Richard Chechile.
Committee: Ayanna Thomas, Robert Cook, and Jessica Chamberland.
Keyword: Cognitive psychology.read less