Date of Award

Summer 2019

Degree Type

Masters Thesis

Degree Name

Master of Arts (MA)

School

Psychology

Committee Chair

Dr. Mark J. Huff

Committee Chair School

Psychology

Committee Member 2

Dr. Lucas Keefer

Committee Member 2 School

Psychology

Committee Member 3

Dr. Alan Hajnal

Committee Member 3 School

Psychology

Abstract

Distinctiveness refers to the memorial benefit of processing unique or item-specific features of a memory set relative to a non-distinctive control. Traditional distinctiveness effects are accounted for based on qualitative differences in how distinctive items are encoded at the time of study. This thesis project aims to evaluate whether a different species of distinctiveness—statistical distinctiveness—may provide a separate contribution to memory beyond traditional encoding-based processes. Statistical distinctiveness refers to the relative frequency with which a specific memory item or set is processed. The current study evaluated statistical distinctiveness through a series of mixed groups in which DRM lists were studied using two of the following three tasks to promote either shallow (“E” identification), neutral (reading silently), or deep/distinctive (pleasantness ratings) levels-of-processing followed by a final recognition test. Participants studied lists in which these tasks were used frequently (80% of lists), equally (50% of lists), or infrequently (20% of lists) which were further compared to a set of pure groups in which all lists were studied using a single task. No recognition advantage was found when tasks were completed infrequently versus frequently. Rather, recognition was greatest for the deep/distinctive task—a pattern consistent with encoding but not statistical distinctiveness.

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