Kolkata: The Central Bureau of Investigation (CBI) has initiated a psychological assessment of the accused in the Kolkata rape-murder case, media reports said.

This test will be conducted by a team of five experts from the CBI's Central Forensic Science Laboratory (CFSL), reported NDTV.

On August 9, the primary suspect, Sanjoy Roy, a civic volunteer with Kolkata Police, was stationed at the RG Kar Medical College and Hospital police outpost, where he had access to all departments.

A 31-year-old postgraduate doctor was found in a semi-nude state with gruesome injuries in a seminar room on Friday morning. She had fallen asleep there the previous night.

While the CBI can conduct this psychological test without court approval, subsequent tests such as brain mapping, lie detection, and narcoanalysis will require judicial permission.

The CBI's team, which arrived in Kolkata yesterday, will question Sanjoy Roy using a pre-prepared list of questions.

A forensic team remains at RG Kar Hospital for the third day, gathering evidence from the seminar hall where the victim's body was discovered.

A psychological test, or psychoanalysis, is used to assess an individual’s habits, routines, and behaviour.

During this assessment, the team may use a layered voice analysis, or lie-detector device, to determine the truthfulness of Roy’s statements. This type of test is also referred to as a "psychological autopsy."