BRAIN MAPPRING | test and Techniques
Posted Feb 2018
Posted Feb 2018
The Brain Mapping Test is also known as P-300 test. In this test of Brain Mapping the suspect is first interviewed and interrogated find out whether he is concealing any information. The activation of brain for the associated memory is carried out by presenting list of words to the subjects. There are three types of words in the list used for Brain Mapping Test,
Part I consisted of neutral words, which have no direct relationship with the case.
Part II consists of probe words directly related to the case and suspects to elicit concealed information, which all suspects have hadopportunity to come to know during the course of events related to the case.
Part III consists of target, which are not part of the first two parts.The words in this part are based on confidential findings which suspect does not know.
The recording of this test is done by acquiring the response through 32 channel EEG-ERP Neuro Scan cording system. It is carried out by asking the suspect to sit down and close his eyes. The 32 channel electrodes are placed over the scalp directly while conducting this test twice by presenting each word in three parts randomly. the suspect is instructed to relax and listen to the words presented in the auditory mode. This test does not expect any oral response from the witness. The conclusiondrawn by the experts after the conduct of the test to indicate the possession of the knowledge about the relevant subject which is helpful in the investigation and collecting of evidence. After the administration of the test, what comes out is that, the person undergoing the test has the knowledge of the crime about which he was questioned (brain mapping). In the said test there is no way to find out what the lie is or what is the information stored in the brain of the person concerned. It can be called the information received of taken out from the witness.
Performing of the Brain Mapping Test on the accused would not take away the protection guaranteed under Article 20(3) of the Constitution of India and the said aspect is not required to be considered at the time of performing or conducting the Brain Mapping Test and only when the statement which has been recorded during the course of the Narco Analysis test, if it is used against the person as evidence at that stage, the same is required to be considered. Therefore, the question of consent at the stage of conducting/ performing the Brain Mapping Test is not required to be considered. As stated hereinabove, conducting /performing of the Brain Mapping Test is a part of investigation and for the investigation by the Investigating Agency the consent of the accused is not required, otherwise the Investigating Agency will not be in a position to further investigate the case, if the consent of the accused is required. At this stage, it is also required to be noted that the accused has not allegedly come forward with the truth and therefore, scientific tests are resorted to by the Investigating Agency.
When the accused/person has not told the truth during the investigation, naturally, that accused/ person would not be voluntarily giving consent for the Brain Mapping Tests as he is always apprehensive that if the Brain Mapping Test is conducted then the same might go against him therefore, he is bound to not give consent. Even it is not expected from a person/ accused to give consent for the Brain Mapping Test when he has not come forward with the truth. As stated above the Brain Mapping Test is a scientific methods of investigation and is the part of investigation. There is no provision under the Criminal Procedure Code to have the consent of the accused before or during the investigation. It is also to be noted that before subjecting the accused to Narco Analysis Test his/her mental fitness will be ascertained and thereafter only accused will be subjected to Narco Analysis Test. The dosage level required to take a person to the hypnotic stage is found to be 3-4 times smaller than those required for stages beyond. Therefore, this low concentration of the drug used in the said test will not have any adverse effect on any system of the body. Necessary precautions are always taken by the medical experts at the time of examination and the doctors and anesthetists and the experts are present at the time of conduction/ performing such test.