Sampling methods for identifying differences in source reliability

Authors
Citation
Da. Montgomery, Sampling methods for identifying differences in source reliability, J GEN PSYCH, 128(1), 2001, pp. 5-20
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Psycology
Journal title
JOURNAL OF GENERAL PSYCHOLOGY
ISSN journal
0022-1309 → ACNP
Volume
128
Issue
1
Year of publication
2001
Pages
5 - 20
Database
ISI
SICI code
0022-1309(200101)128:1<5:SMFIDI>2.0.ZU;2-M
Abstract
This study explored observer performance in using across-trial and within-t rial variability information to weight sources based on reliability. Three trained observers performed a multi-element, visual signal-detection task u nder 3 block-type conditions: a fixed block condition and 2 random conditio ns. In the fixed block condition, the observers had both within- and across -trial variability information to identify differences in source reliabilit y. The random conditions eliminated the across-trial information, leaving o nly within-trial variability information in I case and neither within- nor across-trial variability information in another case. There was a significa nt block-type effect. Observers could use differences in across-trial varia bility of individual sources to assign weights. Although there was a differ ence in the weights assigned to reliable and unreliable sources in the part ial-random condition (in which within-trial variability information was ava ilable), only 1 participant showed a significant difference in the weight a ssignment relative to the full-random condition. Thus, altogether, observer s were not very efficient at using within-trial variability to weight sourc es accordingly.