P300 Component
The P300 is an electrically positive charge that peaks between 300-500 milliseconds in response to rare, meaningful, or noteworthy stimuli. It has been recognized by the scientific community as a well-established phenomenon since 1965 and is elicited when subjects encounter infrequent but significant events.
In Brain Fingerprinting, targets are designed to be noteworthy (eliciting P300), while irrelevants should not trigger this response. The technique relies on the premise that guilty individuals will recognize probe stimuli as relevant information they possess knowledge of.
MERMER Component
MERMER stands for Memory and Encoding Related Multifaceted Electroencephalographic Response. This component includes the P300 plus subsequent electrical changes occurring at approximately 800-1200 milliseconds after stimulus presentation.
According to Dr. Farwell, MERMER provides results with higher confidence levels (99% or more) compared to P300 alone because it records additional data points. However, MERMER has not undergone independent peer review testing and is not well accepted in the scientific community.
Scientific Perspectives
Three scientists interviewed during GAO research expressed concerns:
- Dr. Donchin noted that while P300 is scientifically established, its specific application for interrogations requires further research, particularly regarding subjective probe selection
- Dr. Iacono acknowledged the technique's early developmental stage and suggested more field testing before forensic application
- Dr. Rosenfeld questioned whether memory reliably stores all life experiences forever, noting that false memories can elicit P300 responses even without prior exposure