BEOS
Definition
Brain Electrical Oscillation Signature profiling, developed by Champadi Raman Mukundan and validated 2003 at NIMHANS Bangalore; uses 32-channel EEG to classify probes as 'experiential knowledge', 'familiar' or 'unrelated'.
- Full name
- Brain Electrical Oscillation Signature profiling
- Developer
- Champadi Raman Mukundan
- Validated at
- NIMHANS Bangalore, 2003
- Method
- 32-channel EEG probe classification
- Output categories
- Experiential knowledge, familiar, unrelated
Common questions
What is BEOS meant to distinguish that a lie-detector polygraph does not?+
BEOS aims to detect whether a subject's brain shows a recognition response to crime-scene-specific details, classifying knowledge as experiential rather than merely familiar, instead of inferring deception from autonomic arousal signals the way a polygraph does.
What is BEOS's current legal status in India?+
The Indian Supreme Court in Selvi v. State of Karnataka (2010) held that BEOS, narcoanalysis, and polygraph testing cannot be administered without the subject's consent, and any results obtained with consent are admissible only as leads, not as substantive proof of guilt.
Related terms
- CQT
- Control Question Test (Reid/Keeler technique): compares physiological response to relevant questions with response to control (probable-lie) questions; the dominant US polygraph format.
- Criminal Profiling
- The inference of an unknown offender's likely characteristics from crime scene behaviour, victimology, and case details. Also called offender profiling, criminal investigative...
- FBI BAU
- Behavioral Analysis Unit at the FBI Academy, Quantico, evolved from the Behavioral Science Unit set up by Howard Teten and Pat Mullany...
- GKT / CIT
- Guilty Knowledge Test, also called Concealed Information Test (Lykken, 1959): tests whether the subject recognises crime-specific details only the perpetrator would know;...
- Modus Operandi
- How the offender commits the crime: the functional behaviour needed to complete it; evolves with experience and feedback.
- Narco-Analysis
- A technique in which a subject is administered a barbiturate or benzodiazepine drug (commonly sodium pentothal or midazolam) to induce a hypnotic...
- Organised vs Disorganised
- The BSU dichotomy proposed by Ressler and Douglas, classifying offenders by scene presentation. Organised scenes show planning; disorganised scenes show chaos. The...
- P300
- Event-related brain potential occurring about 300 ms after a meaningful stimulus; Lawrence Farwell's 'Brain Fingerprinting' uses P300 amplitude to flag concealed recognition...
- Polygraph
- An instrument that simultaneously records multiple physiological channels including blood pressure, respiration rate, galvanic skin response, and sometimes heart rate while the...
- Signature
- Psychologically expressive behaviours that go beyond what's needed to complete the offence: posing the body, ritual acts, taking trophies, leaving messages. Signature...
- Sodium Pentothal
- Sodium thiopental, an ultra-short-acting barbiturate; intravenous infusion at a slow drip lowers cortical inhibition and is the standard agent for narco-analysis.