Suspected malingering and the Digit Memory Test: a replication and extension.

Area of Science:

• Neuropsychology
• Cognitive Assessment
• Clinical Psychology

Background:

• Malingering, the intentional simulation of illness, poses a challenge in clinical and forensic settings.
• The Digit Memory Test (DMT) is a tool used to assess cognitive function, particularly memory.
• Previous research suggested differences in DMT performance between malingerers and individuals with genuine cognitive impairment.

Purpose of the Study:

• To replicate findings on Digit Memory Test (DMT) performance in suspected malingerers versus patients with brain dysfunction.
• To investigate DMT performance in patients with specific neurological conditions (aphasia, temporal/frontal lobe damage, dementia).
• To establish criteria for identifying potential malingering based on DMT performance and dementia screening.

Main Methods:

• Replication of a prior study comparing suspected malingerers and patients with brain dysfunction on the DMT.
• Assessment of DMT performance in patient groups with aphasia, temporal lobe damage, frontal lobe damage, and dementia.
• Utilized the BNI Screen for Higher Cerebral Functions to assess for dementia.

Main Results:

• Suspected malingerers performed worse than patients with unequivocal brain dysfunction on the DMT.
• Patients with aphasia and temporal/frontal lobe damage performed better than suspected malingerers.
• DMT performance in patients with true dementia may overlap with that of suspected malingerers.

Conclusions:

• Low DMT performance (<95% across three trials) in non-demented individuals warrants consideration of malingering.
• The DMT can aid in differentiating malingering from some forms of brain dysfunction.
• Distinguishing malingering from dementia solely on DMT requires caution; additional cognitive screening is crucial.