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Same-sex marriage legalization associated with reduced anti-gay bias

A study suggests that attitudes and legislation may be mutually reinforcing: evolving attitudes toward same-sex marriage may serve as impetus for legalization.

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A study of evolving attitudes toward gay marriage – this time in the US – suggests that legislation has had a significant impact in reducing anti-gay bias.

The findings in “Same-Sex Marriage Legalization Associated with Reduced Implicit and Explicit Anti-Gay Bias”, by Eugene K. Ofosu et al. and published in PNAS, provide evidence that public policy can shape social norms and alter individuals’ attitudes, said senior author Eric Hehman, a professor in McGill University’s Department of Psychology.

In 2004, Massachusetts became the first US state to legalize same-sex marriage in that country. In the following years, 34 other states and Washington, D.C., would follow suit before the US Supreme Court ultimately ruled, in June 2015, that same-sex couples could marry nationwide. Since then, polls have suggested that support for same-sex marriage has steadily increased.

The researchers set out to measure whether and how legislation had an impact on anti-gay bias.

“The idea that norms shape attitudes has been around in social psychology for many years,” said Hehman. “We wanted to measure if laws and policies can also act as norms and potentially change deeply rooted biases.”

Since same-sex marriage was legalized in different states over the course of 11 years, Hehman’s team was able to map trends in anti-gay bias during this period.

By geolocating responses at Project Implicit – a website launched in 2002 that measures biases of respondents – Eugene Ofosu, a graduate student working with Hehman, examined changing regional anti-gay biases of about one million respondents during a 12-year period. The researchers compared these trends before and after state-level legalization of gay marriage in each state.

Though implicit and explicit bias against the gay community was decreasing or stable prior to same-sex marriage legalization, the researchers found that legislation supportive of this marginalized population caused anti-gay bias to decline at roughly double the previous rate.

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In the 15 states that did not pass same-sex marriage legalization locally by contrast, Hehman found a “backlash effect.” In those states, anti-gay bias increased in the immediate aftermath of the Supreme Court ruling making gay marriage legal nation-wide.

One possibility, Hehman said, is that — even though attitudes were shifting toward more acceptance of same-sex marriage, a tipping point of support had not yet been reached in those states for the majority to accept the federal ruling.

The study also suggests that attitudes and legislation may be mutually reinforcing: evolving attitudes toward same-sex marriage may have served as impetus for both state and federal legalization.

“In other words, representative governments can contribute to and/or intensify change in the attitude of citizens by passing legislation,” Hehman said. “We have some evidence that the laws caused this changed in bias, but it is possible the effect goes in both directions.”


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