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          P.S. Klimov and L.V. Litvinova

          Greater development and functionality in the left hand rather than the right, which is generally a characteristic present at birth, is a well-researched phenomenon known as left-handedness. Hidden left-handedness is diagnosed when a left-handed person primarily uses his right hand. Forcible retraining of left-handed children often leads to nervousness, stuttering and involuntary urination, but many left-handers are able to write with their right hands with no particular difficulty.

           Left-handedness is most frequently determined via the use of numerically-graded questionnaires. The answers given to their 5 to 20 questions indicate a preference for one or the other hand in the execution of everyday tasks. It is this method that is used to determine left and right-handedness among 6 to 7-year-olds. However, not all children are able to objectively assess with which hand they conduct  tasks more easily, more assuredly and better. "Lacing the fingers”, the "Napoleon pose”, "simultaneous use of both hands”, measuring the strength of each hands with a dynamometer, recording the speed with which each hand strikes a sheet and so on are more specialised tasks.

           The Egoscop® Objective Psychological Analysis and Testing Software System's Tapping Test was selected for use in uncovering hidden left-handedness for our research. The additional data provided by the Egoscope is provided via the simultaneous recording and analysis of psychomotor physiological reactions and the rate of change in the parameters of the autonomic nervous system (ANS) and the central nervous system (CNS) during a psychophysiological examination. Indeed, the Egoscope's simultaneous recording of parameters of differing modalities which indirectly reflect changes directly connected with the current situation of the subject is one of the system's main strengths.

           Our test equipment consisted of a metal board and a small rod. The tapping test was conducted in eight stages, each lasting five seconds. The programme was composed of two series of tests, one for each hand. The results were subsequently analysed and evaluated against two criteria, the frequency and strength with which the rod had been tapped against the board, which made it possible to calculate an asymmetry coefficient for each stage of the test (Figure 1). A positive asymmetry coefficient shows that the right hand led during the test, whereas a leading left hand is shown as a negative coefficient. Its size reflects the degree to which the dominant hand was more active, and data on the strength of the taps is included as additional information.

 Figure 1. Tapping test results – right-handed subject

           First-year students from the Institute of Education and Social Sciences who had indicated in their questionnaires that they wrote notes during lectures with their right hands were used as subjects for the research.

           The data gathered during the tapping test showed that students whose profiles suggested that their left hands had hidden capabilities (P<0,001) had been included in the right-handed sample group.

 Figure 1. Tapping test results – right-handed subject with hidden left-hand capabilities

           Those students whose profiles were indicative of hidden left-handedness were given additional questionnaires as a result of the data returned by the test. Their answers showed that the right-handers who had been diagnosed with hidden left-handedness as a result of the tapping test had been retrained to write with their right hands in childhood. For most of them the fact that they had been retrained was a bitter memory of a traumatic childhood experience and of interest was the fact that the hidden left-hander continued to regard the person who had retrained him or her, be it a parent, relative or nursery teacher, as a negative persona.

           The results of the research outlined above dictate that left-handedness should be determined with greater care, and that the data recorded should be analysed in greater detail. This is particularly important for students who have chosen professions which will bring them into contact with extreme situations, as hidden left-handedness could result in them reflexively making an unconscious attempt to quickly carry out a critical action with the left hand. Parachutists, pilots, drivers and others who work in extreme environments and operate equipment designed for right-handers are all at risk from hidden left-handedness. Timely diagnosis of hidden left-handedness will thus help to avert tragedy in both professional and everyday life.

     Published by:  Климов П.С., Литвинова Л.В. ИСПОЛЬЗОВАНИЕ НОВОЙ МУЛЬТИДИСЦИПЛИНАРНОЙ ТЕХНОЛОГИИ «ЭГОСКОП» ДЛЯ ОПРЕДЕЛЕНИЯ СКРЫТОГО ЛЕВШЕСТВА // Материалы V Международной студенческой электронной научной конференции «Студенческий научный форум»

URL: <a href="http://www.scienceforum.ru/2014/2/6523">www.scienceforum.ru/2014/2/6523</a> (дата обращения: 03.03.2014).

     Published file: Klimov_Litvinova.PDF

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