The use of visual stimuli in polygraph testing 

The use of visual stimuli in polygraph testing-prof. dr. Zvonimir Roso

The use of visual stimuli in polygraph testing reaches back to the very beginning of the scientific era of detecting lies with polygraph. Earliest praxis and experiments with the use visual stimuli are known from the Tosseti case, where Italian criminologist and physician, Cesare Lombrosso, used a victim’s photograph as a visual stimulus. In our region prof. dr. Zvonimir Roso, recognized as a founder of former Yugoslav polygraph praxis, introduced this method and administered such test. This may be considered as the prevalent reason this method has been operatively still in use within our region, while the rest of the world employs it rather rarely. Generally viewed, visual tests are structurally closer to »Recognition Tests« though they can be constructed as »Detection of Deception Tests« as well. This draws them nearer to modern world issues and its context of modern society, which aims to be more visual as ever, more digital or even hyper digital. Adequately to this argument, the method shall be considered regarding the detection of deception in general. There are several advantages of visual tests and mainly correspond to contemporary world challenges as global migrations, media problems, legislative obstacles etc. The whole modern polygraph milieu acknowledges and recognizes these advantages. While the American polygraph examiners recognize these benefits and priorities, they are nevertheless more »Detection of Deception Tests« oriented. The use of visual stimuli, as it had been used and as it has been developed until today, dictated also the upgrades and modifications of existing polygraph hardware and software. The newest versions of polygraph software already have included our proposals and solutions to ease the use of visual tests in operative way. These solutions spread the assortment of polygraph examiner’s tools while detecting a lie and practically enable the optimal use of these tests in praxis.