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Kwemakore akawanda, bvunzo dze polygraph dzave dzichishandiswa kuyedza chokwadi chezvakataurwa nemumwe munhu. Kutaura zvazviri, munhu anogona kutaura zvechokwadi kuti bvunzo yekuongorora nhema - chiratidzo chesainzi - ndeyekurwisa husori. Ichi chishandiso chakakosha chinogona kushandiswa mukuferefeta mhosva kugadzirisa mhosva uye kuwana chokwadi.
The polygraph yemazuva ano kuchinja mumuviri wemunhu paanopindura mibvunzo. Kuchinja kwakadaro kunogona kukanganisa kurova kwemoyo, BP, uye kufema. Vanhu vanowanzova nemhinduro yemuviri pakureva nhema yakasiyana neyavanenge vachitaura chokwadi. Kana mumwe munhu akanyepa, muchina wepolygraph unogona kuona shanduko idzi dzemuviri uye kuona kuti ndiani ari kunyengedza.
Munhu wepanguva ino anoita polygraph anonzwa kurira kwebiosensor iyo inopindura kune mhinduro dzemuviri. Masensa anoona mhinduro dzemuviri wemunhu sezvaanopindura mibvunzo yakatevedzana. Mibvunzo inobvunzwa iri nyore uye mimwe yacho ichave yakaomawo; izvi zvinoitirwa kuyedza kugona mumamiriro ezvinhu akaoma. Munhu wese anotanga kutaridzika achinetseka uye achishushikana paanopindura mibvunzo chaiyo…. pamwe anoreva nhema.
apo polygraph yemazuva ano inogona kuva chishandiso chinobatsira, zvakakosha kunzwisisa kuti michina iyi haisi nguva dzose yakarurama. Kune vamwe vanogona kugona maitiro avo emuviri kana kuratidza zviratidzo zvekunyengera pavanoreva nhema. Ndokusaka mhinduro dzebvunzo dzekuongorora nhema dzisingagone kushandiswa mudare. Kare, dzinonyanya kushandiswa senzira yekuunza vaongorori mberi munzira yekuferefeta.
Zvisinei, polygraph yemazuva ano zvinogona kushanda sezvishandiso zvinokosha mukuferefeta mhosva. Zvinogona kubatsira vaferefeti mukuisa vanhu vanofungidzirwa pakutanga kana kuona kuti munhu ari kutaura chokwadi kusvika papi nezvebasa rinoitwa mukuparwa kwemhosva. Vaferefeti vanoita bvunzo dze polygraph kanokwana gumi pavanhu vakamupoteredza kuti vazadze ruzivo rwusipo uye pamwe nekugadzirisa nyaya nekukurumidza.
Kunyangwe vhezheni yazvino yekuyedza polygraph ingave chishandiso chinobatsira chete, haisi yekusaziva. Yeuka kuti mhedzisiro inogona kusiyana kune muongorori wega wega uye kune anotora bvunzo. Ndosaka mhedzisiro yepolygraph ichingofanira kubatwa seruzivo rumwe chete mukuferefeta kwemhosva chero kupi zvako.
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