Neural correlates of feigned memory impairment
Section snippets
Subjects
Twenty-nine volunteers – 23 Chinese and 6 Caucasians – participated in the three fMRI experiments. Informed consent was obtained from all of them. They were strongly right-handed as judged by the Lateral Dominance Test (Spreen and Strauss, 1991) and were recruited into the study based on the following criteria: (1) their attention span reached or exceeded a seven-digit level as measured by the Digit Span Test, and (2) they achieved full scores on the experimental tasks that were to be
Results
No errors were committed by any of the subjects when performing the task under the “answering correctly” condition. Under the “faking badly” condition, the response accuracy of the Chinese males doing the word task, the Chinese men doing the digit task, the Chinese women doing the digit task, and the Caucasians doing the digit task were 47%, 53.57%, 44.38%, and 43.33%, respectively.
The fMRI images illustrating the contrast between the task-induced brain activation associated with feigning
Discussion
We hypothesized that activation of the PFC and PC would be observed during the act of feigning memory impairment when the participants were tested on a forced-choice format, regardless of the modalities of the stimuli used, or the participants' genders and mother tongues. Consistent with our a priori speculation that the strategies employed, and hence the underlying cognitive processes and their neural activities associated with feigning memory impairment, would be the same regardless of gender
Conclusion
The reproducibility of activity in the prefrontal and parietal regions while people were trying to feign memory impairment has been demonstrated and reported here. The pattern of activation associated with feigning memory impairment that was observed and reported here is largely consistent with the findings of our previous research (Lee et al., 2002) and with those of other deception studies (e.g., Spence et al., 2001, Kozel et al., 2004), which means the cognitive processes underlying
Acknowledgments
This project is supported by the CERG project 7159/02H administered by the Research Grant Council of Hong Kong and the RGC-Fulbright Hong Kong Scholar Programme.
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