Jury Decision Making: Extra-Legal Influences

Foundations of Jury Decision-Making and Extra-Legal Influences

• Role of the Jury:

  • The jury is composed of laypersons from the community.

  • Jurors are legally mandated to evaluate evidence impartially, objectively, and fairly.

  • Despite the legal presumption of impartiality, jurors are susceptible to non-evidentiary and extra-legal factors that compromise rational adjudication.

• Cognitive Bias vs. Moral Bias:

  • Cognitive Bias: Systematic errors in human information processing, perception, and decision-making that occur involuntarily without conscious malice or discriminatory intent.

  • Moral Bias: Value-laden, intentional, or ethically compromised judgments driven by personal animus, ideological beliefs, or explicit prejudice.

  • Perceptual analogies demonstrate how human judgment can be systematically distorted despite objective realities:

  • In optical illusions like the Müller-Lyer illusion, identical line lengths are perceived as unequal due to contextual arrow cues.

  • Human cognitive systems naturally misjudge external stimuli, mirroring how jurors unintentionally misjudge facts when influenced by contextual or demographic cues.

Systemic Injustice and Historical Precedent: The Case of Donald Marshall Jr.

• Historical Background:

  • Donald Marshall Jr., a Mi'kmaw man from Membertou, Nova Scotia, was wrongfully convicted in 1971 for the murder of Sandy Seale in Sydney, Nova Scotia.

  • Booking record at Dorchester Penitentiary reflects identification number 1997, dated July 12, 1973 ($7\text{ }12\text{ }73$).

  • Marshall served $11$ years in prison for a crime he did not commit before being acquitted in 1983 after witness recantations and evidence that Roy Ebsary was the actual killer.

• Significance to Extra-Legal Influences:

  • Highlights systemic racism and deep-seated racial bias within Canadian criminal justice and jury decision-making.

  • Demonstrates that Indigenous defendants are vulnerable to stereotypes, racial animus, and procedural indifference from predominantly White investigative and judicial personnel.

  • Resulted in the 1989 Royal Commission on the Donald Marshall, Jr., Prosecution, which concluded that the Canadian criminal justice system failed Marshall at every turn due to systemic racism.

Contextual Extra-Legal Influences on Trial Adjudication

• Contextual Hierarchy Framework (Najdowski & Stevenson, 2026; Liefgreen et al., 2021):

  • Motive: Jurors exhibit explanatory preferences regarding why an actor performed an act, seeking internal intent before evaluating legal justification.

  • Circumstances: Situational factors surrounding the commission of an offense, influencing perceived culpability.

  • Environment: Broad ecological, institutional, or social environments that color juror perception and contextual expectations.

• Attribution Theory and the Fundamental Attribution Error (Heider, 1958; Ross, 1977):

  • Criminal attribution categorizes causes of behavior into:

  • Internal Causes: Dispositional attribution (e.g., "They committed the act because they are a bad, immoral, or dangerous person").

  • External Causes: Situational attribution (e.g., "Environmental pressures and external situational factors led to this behavior").

  • The Fundamental Attribution Error (FAE): Jurors exhibit a pervasive cognitive distortion by overestimating internal, dispositional qualities of defendants while vastly underestimating situational and environmental variables.

• Additional Contextual Pressures (Carlsmith et al., 2002; Feigenson, 2000; Sommers & Ellsworth, 2003; Steblay et al., 2006):

  • Framing Effect: How information is structurally presented alters juror assessments; identical facts yield divergent verdicts when framed through differing narrative architectures.

  • Emotional Intensity: High-emotion cases cloud analytical evaluation and lead to more punitive reactions compared to emotionally neutral trials.

  • Crime Type and Violence: Highly violent offenses trigger immediate punitive desires, heightening juror moral outrage and lowering the threshold of reasonable doubt.

  • Pre-Trial Publicity (PTP) and Media Influence: News coverage frames juror expectations prior to court entry; jurors exposed to pervasive media coverage frequently construct preconceived guilt narratives before receiving admissible trial evidence.

The Mechanics of Implicit Bias

• Verbatim Definition (Greenwald & Banaji, 1995):

  • Implicit biases refer to the unconscious attitudes, stereotypes, and associations that influence understanding, actions, and decisions in an involuntary manner.

  • These operate below conscious awareness, lacking deliberate intent or explicit endorsement.

• Core Dimensions:

  • Implicit Stereotypes: Unconscious attribution of specific behavioral traits, characteristics, or motives to individuals based on group membership.

  • Implicit Attitudes: Unconscious positive or negative evaluations, valences, or feelings directed toward social categories.

• Measurement via the Implicit Association Test (IAT; Greenwald, McGhee, & Schwartz, 1998):

  • Assesses reaction-time latencies (in milliseconds) when pairing social category concepts (e.g., Black vs. White faces) with evaluative words (e.g., "good" vs. "bad").

  • Faster categorization speeds indicate stronger automatic associations stored in memory.

  • Access portal: https://implicit.harvard.edu/implicit/user/demo.canada/ca.static/takeatest.html

• Common Demographic Vectors of Implicit Bias:

  • Race: Stereotypes linking Black and Indigenous individuals to violence, criminality, and culpability.

  • Gender: Stereotypes regarding masculinity, male aggression, female emotional vulnerability, or diminished female agency.

  • Socioeconomic Status (SES): Stereotypes characterizing low SES individuals as dishonest, untrustworthy, or predisposed to crime.

  • Attractiveness: The "halo effect" equating physical attractiveness with moral virtue and high character, and physical unattractiveness with deviance.

Empirical Research and Methodological Limitations in Legal Psychology

• Methodological Paradigms:

  • Archival Case Analysis: Examination of historical real-world sentencing outcomes and verdict records across jurisdictions.

  • Mock Trial Experiments: Laboratory-based experimental simulations manipulating target independent variables (e.g., defendant race, attractiveness, SES) to measure dependent verdict and sentencing outputs.

• Crucial Methodological Limitations:

  • Geographic Narrowness: Mock jury research is predominantly conducted within the United States, limiting cross-cultural generalizability to legal jurisdictions like Canada, the UK, or continental Europe.

  • Participant Homogeneity: Psychological research samples are overwhelmingly skewed toward White university undergraduates, failing to represent genuine community demographics.

  • Mock Juror vs. Mock Jury Design:

  • Individual mock juror studies measure isolated, individual written verdicts.

  • Real juries operate via multi-member group deliberation, which can either amplify, attenuate, or polarize pre-existing individual biases.

Defendant Demographic Characteristics and Juror Judgments

• Race (Demuth & Steffensmeier, 2004; Maeder et al., 2015; Mazzella & Feingold, 1994; Mitchell et al., 2005; Sweeney & Haney, 1992):

  • Mock jurors render systematically harsher verdicts for Black and Indigenous defendants compared to White counterparts facing identical fact patterns.

  • Violent Offenses: Black defendants receive significantly longer prison sentences and higher monetary fines than White defendants.

  • White-Collar Offenses: An inverse bias manifests where White defendants receive stronger punishments than Black defendants for crimes such as fraud or corporate theft.

• Gender (Mazzella & Feingold, 1994):

  • Mock jurors apply significantly stronger punishments and harsher sentences to male defendants relative to female defendants across comparable offenses.

• Socioeconomic Status (SES) (Mazzella & Feingold, 1994):

  • Low SES defendants receive higher rates of guilty verdicts than high SES defendants.

  • Punitive sentencing is more severe for indigent or low-income defendants than for wealthy defendants.

• Attractiveness (Mazzella & Feingold, 1994):

  • The "attractiveness leniency effect" yields fewer guilty verdicts for defendants perceived as conventionally attractive.

  • Attractive defendants receive significantly shorter prison sentences and milder penalties.

  • This leniency is heavily pronounced in violent offenses such as Robbery and Sexual Assault.

Victim Characteristics and Their Interaction with Juror Outcomes

• Race of the Victim:

  • Defendants receive significantly stronger, more punitive punishments when the victim is White compared to when the victim is Black (Demuth & Steffensmeier, 2004; Mitchell et al., 2005).

• Gender of the Victim:

  • When the victim is female, the defendant faces a significantly higher probability of conviction (guilty verdict) and receives harsher sentencing.

• Null Effects:

  • Victim Socioeconomic Status: Empirical meta-analyses reveal no significant main effect of victim SES on juror guilt determinations or sentencing severity.

  • Victim Attractiveness: Unlike defendant attractiveness, variations in victim physical attractiveness yield no statistically significant difference in juror verdicts or sentencing outcomes (Mazzella & Feingold, 1994).

Interventions to Address Implicit Jury Bias

• Diversity Training (Jackson et al., 2014):

  • Educates empaneled jurors on the universal psychological reality that all humans maintain unconscious heuristics and associations.

  • Equips jurors with concrete cognitive strategies to actively monitor, identify, and interrupt biased assumptions.

  • Encourages deliberate, non-confrontational communication styles during jury-room deliberations.

• Jury Orientation Videos:

  • Traditional orientation videos only teach general court decorum and procedure, omitting cognitive bias.

  • Because 100% of empaneled jurors must watch orientation materials, videos represent an optimal intervention point to prime objective, egalitarian mindsets.

  • Proposal by Roberts (2012): Urged legal jurisdictions to integrate an explicit orientation module on implicit bias and invite jurors to take an Implicit Association Test (online or on paper) to self-identify unconscious associations.

  • Washington State Implementation: Implemented a mandatory $20\text{-minute}$ orientation video dedicated specifically to introducing implicit bias to all prospective jurors.

• Voir Dire (Jury Selection Inquiries):

  • The standard judicial inquiry poses: "Can you render a fair and impartial verdict?"

  • Multiple concepts of fairness exist (equity, impartiality, fair-mindedness, justice, integrity, uprightness, honesty, righteousness, justness, right), but self-assessment fails in practice.

  • Core Inherent Flaws:

  • Jurors lack conscious awareness of their own automatic biases, rendering self-policing impossible.

  • Jurors are unwilling to publicly disclose prejudices or appear socially undesirable in a formal courtroom environment.

• Targeted Jury Instructions:

  • Standard pattern instructions vaguely order jurors not to let bias enter their deliberation, failing to explicitly distinguish implicit from conscious bias.

  • Washington State Model Unconscious Bias Instruction: Crafted to accompany their unconscious bias orientation video:

  • "You must decide the case solely on the evidence and the law before you and must not be influenced by any personal like or dislikes, opinions, prejudices, sympathy, or biases, including unconscious bias. Unconscious bias are stereotypes, attitudes, or preferences that people may consciously reject but may be expressed without conscious awareness, control, or intention, Like conscious bias, unconscious bias too can affect how we evaluate information and make decisions"

• "Race-Switching" Counterfactual Exercises (Lee, 2013):

  • Developed specifically for self-defence trials where racialized perceptions of fear, threat, and danger dictate legal outcomes.

  • Attorneys instruct jurors to engage in a mental substitution: preserve all physical actions, dialogue, and temporal sequences of the incident, but switch the races of the parties involved.

  • Direct Jury Prompt: Attorneys ask: "If a defendant is Black and the victim is White – would you make the same verdict decision if the defendant was White and the victim was Black?"

  • Functions as a cognitive forcing mechanism to highlight disparate standards of reasonable apprehension.

• Expert Testimony:

  • Involves calling qualified legal psychologists to testify before the jury regarding cognitive architecture, memory distortions, and the operation of implicit bias.

  • Aims to bridge the gap between implicit cognition and explicit behavior so jurors evaluate witness credibility and evidence with scientific nuance.

  • Remains largely theoretical and unadopted in standard trial procedure.

Structural Barriers and Risks in Remediating Bias

• Severe Resource Constraints:

  • Financial Capital: Modifying systemic trial workflows, shooting professional media, and retaining specialists incurs high public expenditure.

  • Technological Infrastructure: Many court facilities lack the hardware required to deploy computerized IAT assessments or multimedia interventions.

  • Staffing and Court Personnel: Judicial officers, clerks, and attorneys require extensive training to administer bias interventions correctly.

  • Court Time: Judicial systems operate under heavy docket delays; adding 20-minute videos, specialized voir dire, and expert testimony prolongs trials.

• Paucity of Applied Empirical Research:

  • Laboratory efficacy does not necessarily guarantee success inside real deliberative jury chambers.

  • Longitudinal field data validating whether interventions genuinely decrease disparate conviction and sentencing rates remains sparse.

• Risk of the Backfire / Reactance Effect:

  • Poorly executed interventions can heighten the salience of race and demographic stereotypes.

  • Exposing jurors to clumsy bias instruction can provoke psychological reactance, defensiveness, or irony-suppression failures, making verdict disparities worse rather than better.

Assigned Readings and Bibliographic References

• Assigned Course Reading: Chapter 6: Jurors and the Police.

• Complete Academic Bibliography:

  • Carlsmith, K. M., Darley, J. M., & Robinson, P. H. (2002). Why do we punish? Deterrence and just deserts as motives for punishment. Journal of Personality and Social Psychology, 83(2), 284–299.

  • Carlsson, R., & Agerström, J. (2016). A closer look at the discrimination outcomes in the IAT literature. Scandinavian Journal of Psychology, 57(4), 278–287.

  • Demuth, S., & Steffensmeier, D. (2004). Ethnicity effects on sentence outcomes in large urban courts: Comparisons among White, Black, and Hispanic defendants. Social Science Quarterly, 85(4), 994–1011.

  • Dressler, J. (1982). New thoughts about the concept of justification in the criminal law. UCLA Law Review, 32, 61–123.

  • Feigenson, N. (2000). Legal Blame: How Jurors Think and Talk about Accidents. American Psychological Association.

  • Greenwald, A. G., & Banaji, M. R. (1995). Implicit social cognition: Attitudes, self-esteem, and stereotypes. Psychological Review, 102(1), 4–27.

  • Greenwald, A. G., McGhee, D. E., & Schwartz, J. L. K. (1998). Implicit Association Test (IAT). APA PsycTests.

  • Heider, F. (1958). The Psychology of Interpersonal Relations. Wiley.

  • Jackson, J. W., et al. (2014). Diversity training and bias reduction in small groups.

  • Lee, C. (2013). Race and self-defense: Toward a normative conception of reasonableness.

  • Liefgreen, A., Yousif, S. R., Keil, F. C., & Lagnado, D. A. (2021). Motive on the mind: Explanatory preferences at multiple stages of the legal-investigative process. Cognition, 217, 104892.

  • Maeder, E. M., Yamamoto, S., & McManus, L. A. (2015). Race salience in Canada: Testing multiple manipulations and target races. Psychology, Public Policy, and Law, 21(4), 442.

  • Mazzella, R., & Feingold, A. (1994). The effects of physical attractiveness, race, socioeconomic status, and gender of defendants and victims on judgments of mock jurors: A meta-analysis. Journal of Applied Social Psychology, 24(15), 1315–1338.

  • Mitchell, T. L., Haw, R. M., Pfeifer, J. E., & Meissner, C. A. (2005). Racial bias in mock juror decision-making: A meta-analytic review of defendant treatment. Law and Human Behavior, 29(6), 621–637.

  • Najdowski, C. J., & Stevenson, M. C. (2026). Extra-legal influences in legal decision-making contexts.

  • Oswald, F. L., Mitchell, G., Blanton, H., Jaccard, J., & Tetlock, P. E. (2013). Predicting ethnic and racial discrimination: A meta-analysis of IAT criterion studies. Journal of Personality and Social Psychology, 105(2), 171.

  • Roberts, A. C. (2012). (Re)forming the jury: Implicit bias orientation and testing.

  • Robinson, P. H. (1982). Criminal law defenses: A systematic analysis. Columbia Law Review, 82(2), 199–291.

  • Ross, L. (1977). The intuitive psychologist and his shortcomings: Distortions in the attribution process. Advances in Experimental Social Psychology, 10, 173–220.

  • Sommers, S. R., & Ellsworth, P. C. (2003). How much do we really know about race and juries? A review of social science theory and research. Chicago-Kent Law Review, 78, 997–1031.

  • Steblay, N. M., Besirevic, J., Fulero, S. M., & Jimenez-Lorente, B. (2006). The effects of pretrial publicity on juror verdicts: A meta-analytic review (updated). Law and Human Behavior, 30(6), 719–729.

  • Sweeney, L. T., & Haney, C. (1992). The influence of race on sentencing: A meta-analytic review of experimental studies. Behavioral Sciences & the Law, 10(2), 179–195.