Abstract/Details

Lifetime of human visual sensory memory: Properties and neural substrate


1999 1999

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Abstract (summary)

A new psychophysical procedure was designed to efficiently characterize partial-report performance and a model was developed to isolate the transient visual sensory memory (VSM) component (also known as iconic memory ) in the performance. The decay of VSM in each subject was well fit with an exponential function thus a lifetime could be characterized for the decay in each subject. It was found that intensive practice with partial-report task prolonged VSM lifetime. This practice effect reveals an unexpected adaptive property of the VSM system as well as a novel dimension of perceptual learning. Of the stimulus parameters, a change of the mean luminance of the stimuli from that of the background shortened the VSM lifetime. Such a “luminance effect” is consistent with the temporal properties of the spatial frequency channels in the visual pathway, most likely revealing the differences in the time course of the decay of the memory traces in these channels.

To identify the neural substrate of VSM, the lifetime for the decay of the neural activation trace in the human primary visual cortex (area V1) were deduced from the visually evoked potential (VEP) recordings for each subject. There was a precise match between the V1 lifetime and the VSM lifetime for each subject. The match held when both psychophysical and physiological lifetimes were prolonged by practice, or shortened by enhancing the mean luminance of the stimuli above the background. This precise match indicates that the cortical location for VSM is V1.

Indexing (details)


Subject
Psychology;
Experiments;
Psychobiology;
Neurology
Classification
0623: Psychology
0623: Experiments
0349: Psychobiology
0317: Neurology
Identifier / keyword
Psychology, Biological sciences, Memory, Neural substrate, Visual sensory memory
Title
Lifetime of human visual sensory memory: Properties and neural substrate
Author
Yang, Wei
Number of pages
129
Publication year
1999
Degree date
1999
School code
0146
Source
DAI-B 60/01, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780599159921, 0599159928
Advisor
Queijeiro, Marisa Carrasco
University/institution
New York University
University location
United States -- New York
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9917097
ProQuest document ID
304514859
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304514859
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