The proposed research is designed to test a variety of theories that have been advanced to explain memory for the duration of an event in animals. The core phenomenon of interest is known as the """"""""choose-short"""""""" effect. The choose-short effect refers to the fact that, no matter which duration was actually presented, pigeons tend to remember the duration as having been short. One well-known theory holds that the increasing tendency to report that the short sample occurred as the retention interval increases implies that the remembered duration of an event shrinks with the passage of time. Three other accounts of this phenomenon assume that the result stems from the fact that an event that is short in duration is more like """"""""nothing"""""""" than an event that is long in duration. As such, when memories eventually fade to nothing (as they do when the retention interval is long), birds tend to select the better of the two available options (i.e., they report that the short sample was presented). Yet another explanation is that birds have the capacity to transform a nominal discrimination task into a signal detection task. The signal-detection framework has been used to interpret findings from studies on human recognition memory for more than two decades, but its relevance to animal memory has not been widely investigated. Because detection theory offers a theoretical framework common to both species, it could help to facilitate the development of relevant animal models of memory impairment in humans.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Research Project (R01)
Project #
2R01MH055648-04A1
Application #
6370894
Study Section
Special Emphasis Panel (ZRG1-BBBP-1 (01))
Program Officer
Kurtzman, Howard S
Project Start
1996-09-15
Project End
2004-06-30
Budget Start
2001-09-15
Budget End
2002-06-30
Support Year
4
Fiscal Year
2001
Total Cost
$111,920
Indirect Cost
Name
University of California San Diego
Department
Psychology
Type
Schools of Arts and Sciences
DUNS #
077758407
City
La Jolla
State
CA
Country
United States
Zip Code
92093
Wixted, John T; Gaitan, Santino C (2004) Stimulus salience and asymmetric forgetting in the pigeon. Learn Behav 32:173-82
Wixted, John T; Gaitan, Santino C (2002) Cognitive theories as reinforcement history surrogates: the case of likelihood ratio models of human recognition memory. Anim Learn Behav 30:289-305