Hostname: page-component-cd9895bd7-gbm5v Total loading time: 0 Render date: 2024-12-28T10:25:06.786Z Has data issue: false hasContentIssue false
  • English
  • Français

G Theory and the reliability of psychophysiological measures: A tutorial

Published online by Cambridge University Press:  25 September 2001

FRANCESCO DI NOCERA ,
FABIO FERLAZZO  and
VALENTINA BORGHI
FRANCESCO DI NOCERA
Affiliation:
Department of Psychology, University of Rome “La Sapienza”, Italy
FABIO FERLAZZO
Affiliation:
Department of Psychology, University of Rome “La Sapienza”, Italy
VALENTINA BORGHI
Affiliation:
Department of Psychology, University of Rome “La Sapienza”, Italy
Get access

Abstract

For some years, the limits of classic reliability theory have been recognized in favor of the Generalizability Theory, which deals simultaneously with multiple sources of error. This measurement model can be particularly useful when applied to research in cognitive psychophysiology. Indeed, studies in this field often deal with estimated measures whose reliability is rarely taken into account. In this paper, we report two generalizability studies in order to investigate the usefulness of G theory in providing information about the reliability of experimental results. The first was carried out on P300 measured during an oddball task, and the second was carried out on ERPs recorded during a recognition memory task. As expected, results showed that P300 modulation was more reliable than ERP memory modulation. This suggests that G theory can be a useful tool to estimate the reliability of psychophysiological findings, complementing and extending results from conventional analyses.

Keywords

Cognitive psychophysiologyReliabilityGeneralizability TheoryP300Old/new effect
Type
Research Article
Information
Psychophysiology , Volume 38 , Issue 5 , September 2001 , pp. 796 - 806
Copyright
2001 Society for Psychophysiological Research

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)