This is what i've just written. This took me almost an hour, but I wasn't really paying much attention, plus I left and went upstairs for a while.
REACHING A VERDICT
Effects of Order of Testimony. Pennington et al. Effects of Memory Structure on Judgement.
To investigate whether story evidence summaries are true causes of the final verdict decisions and the extent to which story order affects confidence in those decisions.
Laboratory experiment.
Self-selected sample.
130 students from Northwestern University and Chicago University.
They were allocated to four conditions in roughly equal numbers.
Participants listened to a tape recording of the stimulus trial and responded to written questions. They were told to reach a guilty or innocent verdict on a murder trial, and then rate their decision on a 5-point scale of confidence.
Each participant was seperated by partitions and had no interaction.
In the story-order condition, evidence was presented in its natural order.
In the witness-order condition, evidence items were arranged in the order of primacy and recency effects.
There were 39 innocent pieces of evidence and 39 guilty pieces of evidence.
In all cases the stimulus trial began with the indictment and followed the normal procedure, ending with the judge's instructions.
Defence evidence
Story order Defence evidence
Witness order Mean
Prosecution evidence
Story order 59% 78% 69%
Prosecution evidence
Witness order 31% 63% 47%
Mean
45% 70% 58%
If the defence showed their evidence in witness order, even more jurors would find a guilty verdict.
If the defence showed their evidence in story order, even more jurors wouldn't find a guilty verdict.
The greatest confidence rating was expressed by those who heard the defence or prosecution in story order.
The lowest confidence rating was expressed by those who heard the defence or prosecution in witness order.
The primacy & recency effects were controlled for.
The case was adapted from a real-life case.
Mainly nurture side of debate.
Individual explanation side of debate.
Mainly reductionism side of debate.
Mainly free-will side of debate.
Mixture of quantitative and qualitative data.
Persuasion. Cutler et al. The Effect of the Expert Witness on Jury Perception.
To investigate whether hearing about pschological research from an expert witness which casts doubt on the accuracy of eyewitness testimony would affect a juror's decision-making by making them more sceptical about such testimony.
Laboratory experiment with videotaped mock trial.
Self-selected sample.
538 undergraduates who were given credit for their course.
Participants watched a taped robbery trial in groups of 2-8. They independently completed a questionnaire containing the dependent measures, which were the verdict, memory test and rating scales on confidence.
The independent variables were Witnessing Identifying Conditions (WIC), witness confidence, form of testimony and an expert opinion.
Juror verdicts - When the WIC were good, more guilty verdicts were given and this affect increased if the expert witness had given a descriptive testimony. Other variables were less significant.
Juror memory - 85% correctly recalled the testimony.memory for what the expert said was good. 50% recalled the four stages of memory. 81% recalled at least 1 stage. They also correctly identified what the expert said about weapon effects, disguises and delays in identification.
Juror confidence - Under the good WIC, the jurors had more confidence in the accuracy of the identificaiton. The effect was stronger if they had heard the expert witness and if the witness was 100% confident instead of 80%.
Mainly nurture side of debate.
Mainly situational explanation side of debate.
Mainly holist side of debate.
Mainly free will side of debate.
Mainly qualitative data.
Effect of Evidence Being Ruled Inadmissable. Pickel. Investigating the Effect of Instructions to Disregard Inadmissable Information.
To look at the effect of prior convictions, the role of judge's instructions when followed by a legal explanation and how much the credibility of a witness affects the juror's ability to ignore inadmissable statements.
A laboratory experiment using a mock trial of a fictional theft with a mock jury.
Self-selected sample.
236 Bali State University Pyschology students.
Independent measures design.
Critical evidence was introduced 'by accident' by the witnesses.
The item was objected to by the attorny and then either allowed or overruled by the judge.
When jurors were instructed to ignore the inadmissable evidence, this ruling was sometimes supported by a legal explanation.
Participants listened to an audiotape of the trial, then completed a questionnaire asking them to make several decisions about the case. The verdict, the estimate of probable guilt and a rating on a 10-point scale of the extent to which knowledge of the prior conviction caused them to believe the defendant was guilty. The also gave a rating on the credibility of the witness.
There was a control group that did not get the evidence.
Mock jurors who heard the critical evidence ruled inadmissable and who recieved no explanation were able to follow instructions and ignore the evidence. They were also less likely to find the defendant guilty.
No evidence was found to support the hypothesis that the credibility of the witness would affect the juror's ability to disregard the inadmissable evidence.
There was no significant effect on the use of prior conviction evidence as measured by the 10-point scale.
Calling attention to inadmissable evidence makes it more important to the jury and they then pay more attention to it.
Nature or nurture.
Individual and situational explanation
Mainly reductionism side of debate.
Mainly determinism side of debate.
Qualitative and quantitative data.