Bidrose, S. & Goodman, G.S. (2000). Testimony and evidence: A scientific case study of memory for child sexual abuse. Applied Cognitive Psychology, 14, 197-213.

Background information.

-Usual lab setting: the typical procedure testing children’s memories of an event involves the child in a controlled event (like playing) and later interview them about their memory of the event. 

-Also, children have been interviewed after a stressful event (i.e. getting a shot at the doctor). The differences between these scenarios and child abuse are that, child abuse usually involves secrecy, shame and lack of emotional support.

 

Related case studies: Terr 1983,88, & 91), suggest that children who suffered a single traumatic event have clear and accurate for the event, but children who suffered repeated trauma tended to have poor memory of the events.

 Jones and Krugman (1986), provide evidence that even very young children can give accurate recall of a traumatic event with a case study of 3 yr old boy who was abducted, assaulted, and left to die. 

 Clarified Terms

Omission error- when there was evidence for abuse but no allegations were made. 

 

The Case

Four girls (ages 8 –15) were being sexually abused by a man (John) and his 7 acquaintances.

 The victims.    The Perpetrators.

Sarah- 14-15 yr old   John, Alfred, Derek, Harold, Michael, and 

Anne 13-14 yr old   two others. 

Paula 12-13 yr old

Mandy 8 yr old

During the course of abuse, the main perpetrator (John) took numerous photographs of the girls as well as recording them on audiotapes.

 The girls were interviewed by the police and later during a deposition by lawyers. The deposition contained more questions and more interviews than did the police interview.

Types of allegations made

  Coercive acts (ex: paying for sex), Preparative acts (ex; arranging sex), and sexual acts.

 

Goal of the Experimenters

Bidrose and Goodman examined the allegations made with supporting evidence (audiotapes or photographs). They also examined omission errors and the consistency in the girls’ testimonies compared with the support (evidence) to see whether inconsistency is an indication of inaccuracy in testimony.

Method

Each victim, perpetrator, and sexual act had own code. Coding units were made. Ex: (123) 1=victim, 2 perpetrator, 3=act etc…)

70 different coded categories were made.

43 were sexual in nature

23 involved a victim and a perpetrator

623 total photos

77audiotapes

Also coded were presence of photographs, making 112 categories in total.

Allegations were either supported (with audiotapes and/or photographs) or not supported

Correct Rejection- Victim denied an act and there was no evidence

Incorrect Rejection-Victim denied a supported act.

 Descriptive Statistics were calculated on the acts grouped by type. (Sexual acts, Coercive acts, Preparatory acts, and ‘Other’)

A comparison was made between the amounts of supportive evidence for allegations made only once with allegations made more than once (at both the police interview and deposition)

Results

Reliability: Inter-rater reliability
Statistics 318 pieces of evidence, 246 allegations, 194 supported, 52 unsupported, 152 omissions.

85.6% supported sexual acts, 42.9% supported coercive acts, 82.5% supported preparatory acts, 90% supported ‘other’ acts.

 

 Supported/Unsupported allegations for each individual victim--: Table 2, Pg 206.

The eight year olds allegations were supported less, but she was also was not involved as long, nor as extensive as the others were. -Less omission errors occurred with this victim.

Audiotape evidence was also scarce.

Ten instances appeared where a victim denied an act and there was no evidence for the contrary, suggesting clear memories.

Three instances of denial of an act supported by evidence occurred.

 A repeated measures ANOVA was ran on level of support for allegations made once or more than once, not showing a significant difference for likelihood of supportive evidence F (1,3)=2.67

No effects on allegations made due to seeing photos between the police interview and the deposition were observed.

Discussion 

The main objective was to examine the testimony with the level of support for each allegation and the extent of abuse when no allegations were made (omission error).

 

The accuracy of the victims in this case compared well to the Yuille & Cutsall study, where people were actively involved in a salient event recovering 85% detail. However, unsupported allegations of the victims in the current study exceeded that of a 13yr old girl abused by her grandfather.

Coercive acts were least supported, 

Conclusions

 The study suggests children can give accurate, detailed, and reliable testimony after sexual victimization. This can be seen for high levels of supportive evidence for allegations made and the tendency to commit more omission errors than to tell of events with no supported evidence. 

 



 
University of Arkansas
Department of Psychology
Lampinen Lab
False Memory Reading Group
False Memory Reading Group Fall 2000