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TZNAME:America/New_York EDT END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT UID:af7171f8b553c1ef5ce5f65bb5484b52 CATEGORIES:RuCCS Colloquia:Fall 2003 CREATED:20151203T141540 SUMMARY:The learning curve. What it really looks like and why it matters. LOCATION:Rutgers University\, Center for Cognitive Science & Department of Psych ology DESCRIPTION:
November 18, 2003 at 1:00pm
Psychology Room 101, Busch Campus
Dr. Charles R. Gallistel
Rutgers Univer sity, Center for Cognitive Science & Department of Psychology
The
learning curve. What it really looks like and why it matters.�
It is widely assumed that the development of learned behavior in standard
animal learning paradigms is gradualr. This assumption is reinforced by the
common practice of publishing learning curves obtained by averaging first
across blocks of trials within each subject, and then across subjects. It h
as often been pointed out that this averaging may yield a curve that seriou
sly misrepresents the progress of learning in individual subjects, but no o
ne has determined what the learning curve looks like in individual subjects
. I have analyzed data from different laboratories, using several different
paradigms and species (pigeon autoshaping, rat autoshaping, mouse autoshap
ing, rat + maze, mouse water maze, and rat eyeblink). In all of these parad
igms, conditioned behavior appears abruptly at close to its asymptotic stre
ngth. The transition from the pretraining baseline rate or strength of resp
onding to the asymptotic level is more abrupt than is the rise of the psych
ometric functions in sensory threshold experiments (for example, the freque
ncy of seeing curve). It is essentially a step. This finding bears on our c
onception of the nature of learning [Is it i) the strengthening of associat
ive bonds, or, ii)� the gathering of information preparatory to making a de
cision to act?]� It also means that the learning curve cannot be used to es
timate the rate of association formation (assuming, for the sake of argumen
t, that there is such a process).