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The Forced Swim Test as a Model of Depressive-like Behavior

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Published on: March 2, 2015

The sad truth about depressive realism.

Lorraine G Allan¹, Shepard Siegel, Samuel Hannah

¹Department of Psychology, McMaster University, Hamilton, Ontario, Canada. allan@mcmaster.ca

Quarterly Journal of Experimental Psychology (2006)

|March 17, 2007

Summary

Depressed individuals show more accurate contingency judgments, unaffected by outcome probability, a phenomenon termed "depressive realism." This suggests depressed individuals may be "sadder but wiser" in their perceptions.

Area of Science:

Cognitive Psychology
Clinical Psychology
Psychophysics

Background:

Depressed individuals reportedly exhibit enhanced accuracy in contingency judgment tasks compared to non-depressed individuals.
Non-depressed individuals are susceptible to the outcome-density effect, overestimating contingency with high outcome probability.
Depressed individuals show a diminished or absent outcome-density effect, leading to the
depressive realism
hypothesis.

Purpose of the Study:

To critically review the existing literature on depressive realism.
To offer a novel interpretation of depressive realism.
To re-examine contingency judgments through a psychophysical lens.

Main Methods:

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Review of existing studies on contingency judgment and depression.

Analysis of the outcome-density effect in depressed and non-depressed populations.

Application of psychophysical principles to contingency judgment tasks.

Main Results:

Depressive realism is characterized by a lack of the outcome-density effect in depressed individuals.
Non-depressed individuals' judgments are significantly influenced by outcome probability.
A psychophysical framework offers a new perspective on these observed differences.

Conclusions:

Depressive realism may be explained by a psychophysical analysis of how individuals process contingency information.
The
sadder but wiser
characterization stems from depressed individuals' resilience to outcome-density biases.
Further research integrating psychophysics could illuminate cognitive biases in depression.