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Behavioral Tests for Site of Lesion

Behavioral Tests for Site of Lesion. SPA 4302 Summer A, 2004. Loudness Recruitment Tests. Based on the changes in loudness perception that accompany different auditory disorders. Cochlear > > > More rapid growth in loudness with increasing level

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Behavioral Tests for Site of Lesion

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  1. Behavioral Tests forSite of Lesion SPA 4302 Summer A, 2004

  2. Loudness Recruitment Tests • Based on the changes in loudness perception that accompany different auditory disorders. • Cochlear > > > More rapid growth in loudness with increasing level • Neural > > > Reduced (or reversed) loudness growth with increasing level.

  3. Loudness Growth Patterns

  4. Recruitment: • "Abnormal growth of loudness" or, persistence of normal loudness above threshold. More common at higher frequencies.

  5. The Short Increment Sensitivity Index • Relies on link between rapid loudness growth (recruitment) and small difference limen for intensity. • People with recruitment (cochlear cases) will be BETTER ABLE to detect very small changes in intensity than others.

  6. Tone Decay • Tests auditory adaptation (an abnormal phenomenon). • How intense does a continuous tone have to be for you to be able to hear it for a full 60 seconds? • Greater decay suggests a neural problem.

  7. Tone Decay Results: • Type I: no decay: norm, conduct or cochlear • Type II: heard for longer times as level is increased: cochlear • Type III: No growth with increasing level: retrocochlear

  8. Bekesy Audiometry • Uses continuous and interrupted tones to test hearing. • People with auditory adaptation (decay) will show poorer hearing in the continuous condition than in the interrupted condition.

  9. Check out the Table 7.1 in your text • Sensitivity, Specificity, and Efficiency are not that high for which tests? • For which tests are these numbers higher? • Which tests would you choose to use?

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