H567/03 Section B Option 2 - Dixon et al. (2002) and jury decisions
Learn how Dixon, Mahoney and Cocks investigated accent and perceptions of guilt, evaluate the evidence, and apply a reasoned strategy to jury judgement.
The question and the controlled comparison
Dixon et al. (2002) investigated whether a suspect's accent influenced listeners' perceptions of guilt, and whether racial cues and crime type qualified that effect.
Previous language-attitude research suggested that listeners sometimes associate standard accents with competence or status. The predicted effect concerned listeners' stereotypes, not actual differences in criminality. The main hypothesis was that a Birmingham, or Brummie, accent would elicit higher guilt ratings than a standard English accent.
The study was a laboratory experiment with an independent-groups factorial design. Each listener heard only one condition, avoiding direct comparison of repeated versions.
| Manipulated factor | Two levels |
|---|---|
| Suspect's accent | Birmingham / standard English, described as RP in the results |
| Racial cue in the interview | Black / White |
| Alleged crime | Armed robbery, classified as blue collar / cheque fraud, classified as white collar |
The combinations produced conditions. The sample was 119 White undergraduate psychology students at University College Worcester: 24 men and 95 women, with a mean age of 25.2 years, participating as part of course requirements. Participants from Birmingham were excluded because the researchers focused on listeners who did not share that accent background. Listeners were randomly assigned to conditions; this is not the same as randomly sampling jurors from the population.
The primary outcome was perceived guilt. The suspect was acted, so the researchers were not discovering who committed a real offence or measuring the accuracy of a verdict.
What listeners heard and rated
The researchers used a matched-guise recording to change accent while retaining the same suspect actor.
Listeners heard a two-minute acted exchange based on a transcript of a British police interview from 1995. A middle-aged, standard-accented male actor played the inspector; a young male actor who could naturally switch accent played the suspect and denied involvement. Using one suspect actor controlled vocal identity better than comparing two unrelated speakers.
The alleged offence changed between armed robbery and cheque fraud. The inspector's spoken description supplied the Black or White racial cue. Listeners did not view defendants of different races in a courtroom. A pretest with 40 raters checked the accent manipulation: over 95% identified the Birmingham accent. The guises did not differ significantly in perceived loudness or pitch, but the Birmingham version was faster. The researchers retained that difference for naturalness, leaving speech rate as a possible alternative influence.
After listening, participants rated guilt on a seven-point innocent-to-guilty scale. They also completed the Speech Evaluation Instrument, measuring perceived superiority, social attractiveness and dynamism. Social attractiveness here concerns the speaker's social appeal; it is not a measure of facial beauty.
The recording and scales standardised presentation and measurement, supporting repeatability. However, a repeatable rating measures an impression. Reliability does not turn perceived guilt into objective guilt, and a single bipolar scale provides less detail than an explanation of why the listener reached a judgement.
What the ratings showed
The results supported an accent effect on perceived guilt, while leaving the cause of listeners' broader impressions uncertain.
| Accent condition | Mean guilt rating |
|---|---|
| Birmingham | 4.27 |
| Standard/RP | 3.65 |
The Birmingham mean was scale points higher. The reported main effect of accent was statistically significant. This is a difference in ratings on a seven-point scale, not a percentage difference in actual convictions or crime.
The Birmingham speaker was also rated lower in superiority. A three-way interaction indicated that accent, racial cue and crime type operated together; the Birmingham/Black/armed-robbery combination received particularly high guilt ratings. This does not establish that Black suspects generally received higher ratings regardless of the other factors. The article reports a comparison with five other cells rather than all seven; do not expand that into a claim about every pairwise comparison.
Lower superiority and social-attractiveness ratings were associated with higher guilt ratings. These two dimensions accounted for about 13% of variation in guilt ratings; dynamism was not a significant predictor. The association does not show that changing superiority directly caused a change in guilt. Both impressions could arise from another evaluative process.
The contribution to courtroom psychology is evidence that a presentation cue can affect judgement in a controlled, limited legal scenario. A cognitive interpretation is that accent activates an expectation about trustworthiness and shapes interpretation of an ambiguous denial. A social interpretation concerns status and group stereotypes. The study does not demonstrate that every listener uses this mechanism or that a complete jury would reach a particular verdict.
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