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Proceedings Fonetik 2009 - Institutionen för lingvistik

Proceedings Fonetik 2009 - Institutionen för lingvistik

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<strong>Proceedings</strong>, FONETIK <strong>2009</strong>, Dept. of Linguistics, Stockholm Universityof group III so that the recognition score on thisset was the same as for the group I+II.For the classification test, two measures μand ∆ were calculated for all subjects. The classificationscore μ is the average proportion ofcorrectly classified animations c out of N presentations.The discrimination score ∆ insteadmeasures the proportion of correctly separatedanimations by disregarding if the label was corrector not. The measures are in the range0≤μ≤1 and 0.5≤∆≤1, with {μ, ∆}=0.5 signifyinganswers at chance level. The discriminationscore was calculated since we want to investigatenot only if the subjects can tell whichmovements are real but also if they can see differencesbetween the two animation types. Forexample, if subjects A and B had 60 and 12correct answers, μ=(60+12)/72=50% but∆=(36+24)/72=67%, indicating that consideredas a group, subject A and B could see the differencebetween the two types of animations,but not tell which were which.The μ, ∆ scores were also analyzed to findpotential differences due to the accompanyingacoustic signal, and correlations between classificationand word recognition score for thesubjects who participated in both tests.Word recognition score (%)70605040302010** ↕↕ *0Figure 2. Percentage of words correctly recognizedwhen presented in the different conditions AudioOnly (AO), Audiovisual with Real (AVR) or Syntheticmovements (AVS). The level of significancefor differences is indicated by * (p

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