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Graded Potential

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Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
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Related Experiment Video

Updated: May 23, 2026

Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies

Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies

Published on: May 9, 2019

Completion potentials of sufficient component causes.

Wen-Chung Lee¹

¹Research Center for Genes, Environment and Human Health and Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan. wenchung@ntu.edu.tw

Epidemiology (Cambridge, Mass.)

|March 28, 2012

Summary

This study introduces the completion potential index, a novel measure for Rothman's sufficient component cause model. This index aids in understanding complex risk factor interactions using standard epidemiologic data.

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Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies

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Published on: June 24, 2016

Area of Science:

Epidemiology
Causal Inference
Biostatistics

Background:

Rothman's sufficient component cause model is widely used in epidemiology.
Existing indices may not fully capture complex causal relationships.

Purpose of the Study:

To introduce and validate a new index, the completion potential index, for the sufficient component cause model.
To demonstrate the utility of the completion potential index in characterizing complex interactions of monotonic risk factors.

Main Methods:

The study proposes the completion potential index.
Assumptions include monotonicity, independent competing causes, and proportional hazards.
Completion potentials are shown to be estimable from cohort, case-control, and time-to-event data.

Main Results:

The completion potential index is estimable from routine epidemiologic data under stated assumptions.
The index offers advantages over traditional measures like rate ratios and attributable fractions.
Hypothetical and real data examples illustrate the index's application.

Conclusions:

The completion potential index provides a valuable tool for analyzing complex causal interactions in epidemiology.
This new index enhances the characterization of multiple monotonic risk factors.
The index is applicable across various common epidemiologic study designs.