New computer programmes to detect liars

While experts have long been trying to use handwriting as a tool in forensic labs or their personality traits, researchers have now developed a computerized tool that can measure handwriting characteristics.

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Headed by Gil Luria and Sara Rosenblum at the University of Haifa, the researchers utilised a computerized tablet that measured the physical properties of the subject''s handwriting, which are difficult to consciously control (for example: the duration of time that the pen is on paper versus in the air, the length height and width of each writing stroke, the pressure implemented on the writing surface).

And they have found that these handwriting characteristics differ when an individual is in the process of writing deceptive sentences as opposed to truthful sentences.

The handwriting tool has the potential to replace, or work in tandem, with popular, verbal-based lie detection technology such as the polygraph to ensure greater accuracy and objectivity in law enforcement deception detection.

Besides, polygraphs are often intrusive to the subject and sometimes inconclusive.

Thus, the handwriting tool provides ease and increased accuracy over common, verbal-based methods.

The study appears in an upcoming issue of Applied Cognitive Psychology.