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Unconscious (or implicit) biases are learned stereotypes that are automatic, unintentional, deeply engrained, universal, and able to influence behavior. Unconscious bias training programs are designed to expose people to their unconscious biases, provide tools to adjust automatic patterns of thinking, and ultimately eliminate discriminatory behaviors. A critical component of unconscious bias training is creating awareness for implicit bias. For over twenty years, the online Implicit-Association Test (IAT) has provided a platform for the general public to assess their unconscious biases. Although the IAT measure has come under scrutiny, it has sparked conversation about unconscious bias in both popular media and the scientific community. In addition to the public’s increased awareness of the influence of implicit biases, the reality of racial and gender inequalities in our society has led to the creation of many unconscious bias training programs. Facebook designed a webpage to make unconscious bias training videos widely available, Google has put about 60,000 employees through a 90-minute unconscious bias training program, and the United States Department of Justice has trained 28,000 employees on techniques to combat implicit bias.

Training Techniques
There are a wide variety of unconscious bias training programs, but the programs tend to follow a basic three-step method. 1. Participants take a pretest to assess baseline implicit bias levels (typically with the IAT); 2. They complete the unconscious bias training task; and 3. They take a posttest to revaluate bias levels after training. Frequently follow-up tests of unconscious bias are administered days, weeks, or months after the completion of training programs to examine the long-term benefits of these programs. The efficacy of these programs is still not clear-cut as researchers continue to test them.

Counterstereotype
According to a metanalysis of 17 unconscious bias interventions, counterstereotype training is the most effective way to reduce unconscious bias. In the area of gender bias, techniques such as imagining powerful women, hearing their stories, and writing essays about them has been shown to reduce levels of unconscious gender bias on the IAT. Dasgupta and Asagari (2004) found that real life counterstereotypes, such as going to a women’s college or having female professors, have the ability to decrease bias because the idea that women are intelligent and hard-working is repeatedly reinforced. In terms of racial bias, several studies have replicated the finding that training participants to pair counterstereotypical traits such as “successful” with images of black individuals is an effective tool for reducing implicit racial bias.

Kawakami, Dovido, and van Kamp (2005) challenged the effectiveness of counterstereotype training when they found that participants actually showed an increase in gender bias after training. Rather than using the IAT to assess levels of unconscious bias, the researchers asked participants to read a resume and decide if the applicant was qualified for a leadership job because, "when ambiguity exists in an individual's qualifications or competence, evaluators will fill the void with assumptions drawn from gender stereotypes". The participants received one of four resumes describing equally qualified candidates. The only difference between the four resumes was the name of the applicant—two had female names and two had male names. When participants were administered the job application task immediately following counterstereotype training, they were more likely to pick the male candidates over the female candidates, which made it appear as though the counterstereotype training was ineffective. However, when the researchers added a distractor task between the counterstereotype training and the job application task, participants selected male and female candidates at an equal rate. When participants had to engage in a cognitive task while simultaneously selecting a candidate, they were more likely to select the female applicants.

The researchers did a follow up study with a slightly different procedure to determine why bias was increased in some conditions and decreased in others. They followed the same counterstereotype training procedure, but divided the job application task into two distinct parts. Participants were either asked to first pick the best candidate for the job and then rank each candidate on sixteen traits (half were female stereotypes and the other half were male stereotypes) or they were asked to complete the tasks in the opposite order. Regardless of the order, participants consistently were biased against women in the first task, but not in the second task. The researchers hypothesized that the participants were able to discern that the purpose of the study was to reduce gender bias, so they showed an increase bias in the first task to compensate for the researcher’s attempt to influence their behaviors. Further research is necessary to determine why participants showed decreased bias on the second task and if the decreased has an enduring effect.

Hu and colleagues (2015) created a form of counterstereotype training to unlearn implicit bias while sleeping. Participants completed the typical counterstereotype training task of pairing images of people with different genders and races with counterstereotypical traits. However, their study differed from previous research because two unique sounds played after each successful pairing of either a gender or race counterstereotype. After the training task, participants were asked to take a 90-minute nap, and their sleep patterns were monitored with EEG. Once participants entered into slow-wave sleep, the researchers played either the sound that followed correct gender counterstereotypes or racial counterstereotypes in the training task. After follow up assessments, the results showed that bias was successfully reduced depending on the sound played during sleep, meaning the people that listened to the sound associated with gender counterstereotypes showed reduced gender bias, but not racial bias, and vice versa. The specific reduced bias remained when the participants returned to the lab a week after initial training and testing.

Negation
Negation training decreases implicit bias through actively rejecting information that reinforces stereotypes, therefore breaking the habit of stereotyping. Kawakami, Dovido, Moll, Hermsen, and Russin (2000) conducted one of the first studies to test the effects of negation training on reducing unconscious bias. In their study, participants were presented with pictures of black and white individuals along with a word that represented a stereotype. The participants were instructed to press “NO” during stereotype-consistent trials (for example, a black person and the word “lazy”), and “YES” during stereotype-inconsistent trials (a black person paired with “successful”). Participants showed significant decreases in automatic bias from the pretest to posttest.

However, Gawronski, Deutsch, Mbirkou, Seibt, and Strack(2006) hypothesized that negation training was not only ineffective, but could actually strengthen unconscious biases. They stated that Kawakami and colleagues only produced positive results because when the participants responded, “YES” to stereotype-inconsistent word-picture pairings, they were using counterstereotyping rather than negation. To test these claims, the researchers created separate counterstereotype and negation conditions. The counterstereotype condition was instructed to press “YES” for stereotype-inconsistent information, while the negation condition was told to press “NO” for stereotype-consistent information. The results showed that the counterstereotype condition decreased implicit bias, but the negation condition increased bias. A possible explanation for the increase in bias with negation training is the level of control required during memory retrieval. During negation training, the memory of a previously held stereotype is activated and then you have to purposefully reject the meaning of the memory. The participants were repeatedly activating the memory of the stereotype, which made it stronger, and they were not able to replace the stereotype with a positive counterstereotype. Alternatively, in counterstereotyping, you do not have to exhibit control to reject a memory because a new and separate memory for stereotype-inconsistent information is formed. Recently, Johnson, Kopp, and Petty (2018) attempted to reconcile the discrepant results of the previous research. They argued the negation was not meaningful and participants were not adequately motivated to get rid of their unconscious biases. The researchers introduced a condition in which participants were told to think, “That’s wrong!” in response to stereotype-consistent information. Other participants were told, instead, to continue to use the typical form of negation and simply responded “No” to stereotype-consistent information. The researchers hypothesized that “No” is an ambiguous and weak response to stereotypes, but “That’s wrong!” is a specific and morally tied response that is hard to ignore. When participants were told to think, “that’s wrong!” in response stereotype-consistent information, there was a decrease in unconscious bias that was not observed in the condition that simply thought “no”. Additionally, the researchers discovered that motivation plays a role in the effectiveness of unconscious bias training programs. After the negation training tasks, participants took the Motivation to Control for Prejudiced Reactions Scale (MCPR) to measure the participant’s drive to change their unconscious biases. People who scored particularly high on the MCPR showed a reduction in bias regardless of the condition. Therefore, if people feel determined to reduce their unconscious biases and think “that’s wrong” rather than “no”, negation training shows promising results for decreasing implicit racial bias.

Perspective-Taking
Perspective-taking creates a sense of empathy for a stereotyped group, which has been shown to improve attitudes towards individuals as well as their group as a whole. Typically, perspective-taking studies follow a three-step procedure. First, participants are exposed to the target minority group through watching a video that displays examples of racial discrimination or through viewing a photograph of an individual from the target minority group. Then participants are told to reflect on that person’s life and their emotions or imagine themselves as the main character. A separate control group watches the same movie or views the same photograph, but they are not given any additional instructions involving perspective-taking. Lastly, participants’ biases are reassessed through answering questionnaires, retaking IAT, or engaging in specific tasks. This prototypical form of perspective-taking has been shown to effectively reduce racial bias.

Dovidio and colleagues (2004) found that a diverse group of strangers can come together as a unified group if they believe they share a common threat. Stimulating a perceived common threat can reduce bias, because people are less likely to be biased against members of their own group. Todd, Bodenhausen, Richenson, and Galinksy (2011) showed participants an image of a black man, had them write an essay about a day in his life, and then watched the participants interact with a black researcher. The face-to-face interactions were more successful and natural with the participants in the perspective-taking condition compared to the control group.

Another example of perspective-taking was tested by Shih, Stotzer, and Guitérrez (2009). They had participants watch a clip of a movie that showed an Asian American being discriminated against and were told to read a college admissions folder and decide if the student should be admitted. The admission profiles were the exact same, except one version checked White for ethnicity while the other checked Asian American. The participants in the perspective-taking condition demonstrated greater empathy towards the Asian profile and were more likely to accept him than the control condition. In 2013, they conducted an additional study in which they added a task where they flashed the pronouns “us” or “them” before showing an adjective with a good or bad connotation. They found that participants that were in the control group quickly associated good adjectives with “us” and bad adjective with “them”, while the perspective-taking group did not show a significant time difference between the two categories. The researchers concluded that empathy and perspective taking could reduce prejudice towards discriminated groups. Kaatz and colleagues (2017) had participants play a video game where they are the character Jamal, a black graduate student working towards a degree in science. Throughout the game, players had to complete tasks such as selecting an advisor, attending conferences, and publishing papers. During each task, the players experienced hardships due to racial discrimination and learn about implicit bias. In order to successfully complete the game, players had to be able to learn how to recognize, label, and talk about bias. After completing the game, participants filled out surveys about their experiences. Most participants agreed that it was an effective strategy for reducing unconscious bias. Further research is necessary to objectively measure the effectiveness of the game.

Meditation
Recently, studies begun to test if meditation can reduce implicit bias. The studies used a form of meditation called Lovingkindness meditation (LKM), which “aims to self-regulate an affective state of unconditional kindness towards the self and others”. The studies followed the format of a pretest IAT, participation in a LKM program, and a posttest IAT. Hutcherson, Seppala, and Gross (2008) showed that a few minutes of LMK could create a sense of empathy and compassion for a neutral target, which inspired the idea to use meditation as a unconscious bias training technique. Stell and Farsides (2016) found that after only seven minutes of LMK, unconscious racial bias for a targeted group was reduced. Kang, Gray, and Dovido (2014) found that participants who attend a 7-week meditation course showed a significant decrease unconscious bias towards African Americans and homeless people. Notably, participants who participated in a discussion based off of the Lovingkindness philosophy for 7-weeks but did not practice meditation did not show a reduction in bias after the 7-weeks.

Implicit Bias Workshops
Implicit bias workshops typically use a combination of strategies to reduce unconscious bias. Devine, Forscher, Austin, and Cox (2012) created a workshop that uses five different techniques to combat bias; stereotype replacement, counterstereotype training, individualism, perspective taking, and increased opportunities for contact with minority races. In stereotype replacement, participants try to recognize their stereotypes, reflect on why they have those stereotypes, consider how they could avoid those stereotypes in the future, and come up with an unbiased response to replace their stereotypes. The counterstereotype training involves picturing examples of counterstereotypes. For example, if the counterstereotype is intelligence, participants are asked to picture an intelligent black individual such as President Obama or a family friend. During the individualism portion of the workshop, participants receive specific information about members of a stereotyped group so they can remember each person as an individual rather than seeing the group as a singular unit. Perspective-taking involves imagining yourself as a member of a stereotyped group. Lastly, participants are provided with opportunities to have positive interactions with members of minority groups. Studies show that four and eight weeks after completing the workshop, and unconscious bias (as measured by the IAT) was reduced. Moss-Racusin and colleagues (2016) created a 120-minute workshop called “Scientific Diversity” that was aimed at reducing gender bias. During the workshop, instructors present empirical evidence on implicit bias, encourage active group discussion, and help participants practice techniques for creating an accepting environment. To assess bias, participants took pretest and posttest questionnaires. The posttest questionnaires revealed that participants experienced increased diversity awareness and decreased subtle gender bias.

According to Gonzales, Kim, and Marantz (2014), the recognition of bias cannot be taught in a single session, so researchers have created workshops or class curriculums that span days, semesters, or even years. Hannah and Carpenter-Song (2013) created a semester-long course that focuses on introspection. Students are encouraged to look within themselves to examine their own bias, values, and most importantly, blind spots. During each class, students discuss articles about various forms of bias and participate in interactive exercises that are designed to promote perspective-taking and empathy. Tests of the course showed that students who have an active interest in learning about issues of implicit bias were able to successfully reduce their levels of bias. However, a subset of the students did not reduce bias or even showed an increased bias after the course because the program was mandatory and they were not incentivized to change their thoughts and behaviors.

Van Ryn and colleagues (2015) started a course for medical school students that studies disparities in minority health care. The researchers were able to implement various forms of the class in forty-nine medical schools and collected data from 3,547 students. During class, students read articles about unconscious bias, hold group discussions, and gain experience with interacting with racial minorities. Participants took the IAT during their first and last semesters of medical school to assess the effectiveness of the program. Though most reductions in implicit bias were small, the reductions were significant and affected behaviors. Students reported feeling more comfortable when working with minorities and kept in mind implicit biases when treating minorities.

Stone, Moskowitz, and Zestcott (2015) conducted a workshop for medical students that used self-reflection techniques to motivate health care providers to address their implicit biases. First, participants took an IAT (but did not receive feedback) and read an article about implicit bias in medicine. A week later, the participants attended a lecture about implicit bias and had a classroom demonstration of an IAT. Two days later, participants discussed strategies for reducing bias, seeking common-identities, and taking the perspective of patients in small groups. When participants retook the IAT three to seven days after the workshop, there was a significant decrease in implicit bias.

Criticisms
Although several studies have shown that unconscious bias training can be an effective tool for decreasing implicit stereotypes and reducing prejudice behaviors, there are still concerns about unconscious bias training programs. In order for unconscious bias training to work, people must acknowledge their biases, be concerned about the consequences of their implicit thoughts, and actively want to change their thoughts and behaviors. It can be challenging to find ways to incentivize participants to change their deeply engrained ways of thinking, and if the programs are mandatory, there could backlash and participants could show an increase in bias. Additionally, though the research behind unconscious training programs is expanding, it is important to keep in mind that unconscious bias training initiatives are still in their infancy and require further research.