<prompt> Tšweletša phetolelo e raraganego kudu ya polelo ye Ditšhupo tša ultrasound di thuša dibatana tša bošego go ithuta go phema dikhunkhwane Dunning DC, Roeder KD wa 1965 Medumo ya dikhunkhwane le mokgwa wa go swara dikhunkhwane wa bomankgagane.  <response>: Ke therešo gore phetolelo e raraganego kudu ya polelo ke e rego: Dipontšho tša ultrasound di thuša dibatana tša bošego go ithuta go phema diphooko Dunning le Roeder 1965, Hristov le Conner, 2005, gomme di ka šitiša bokgoni bja mpšhe bja go tseba ka go lebanya moo diphooko tše di fofago di lego gona Ratcliffe le Fullard, 2005. 