摘要:

A patient with a cerebellar hemorrage was evaluated using electronystagmography (ENG). Data obtained on the horizontal channel were only mildly abnormal. However, vertical nystagmus was clearly evident when the patient was tested in a darkened room with eyes open. This additional procedure may have saved the patient severe complications. With eyes open in darkness vertical nystagmus is more easily differentiated from eye blinks and clinicians are encouraged to look for this valuable central vestibular system sign.

ISSN:0196-0202    

出版商:OVID    

年代:1990

数据来源: OVID

摘要:

Click interaural attenuation (IA) was measured behaviorally and with the auditory brain stem response (ABR) in two unilaterally deaf adults with Etymotic ER3A insert earphones, and TDH-39P and TDH-49P supraaural earphones. Stimulus crossover for each set of earphones was also determined with pure-tone audiometry. Pure-tone results agreed with previous research, showing that the ER-3A provided substantially greater IA than the supraaural earphones, particularly for low frequencies. For click stimuli, behavioral and ABR results revealed only modest, if any, improvement in IA with the ER-3A relative to the supraaural earphones. The results of this study suggest that while the ER3A earphones provide a clear IA advantage for behavioral pure-tone audiometry, they do not eliminate the need for contra-lateral masking of click stimuli in ABR testing.

ISSN:0196-0202    

出版商:OVID    

年代:1990

数据来源: OVID

摘要:

The attenuation provided by TDH earphones in MX-41/AR and P/N 51 cushions, Audiocup earphone enclosures and ER3A insert earphones with ER3-14 foam earplugs was determined for 30 normally hearing subjects using a real-ear attenuation at threshold paradigm. The MX-41/AR and P/N 51 cushions provided about the same amount of attenuation which was less than the attenuation provided by the Audiocup enclosures. The ER-3A/ER3-14 provided the highest amount of attenuation. The MX-41/AR and ER-3A/ER3-14 attenuation values were in agreement with other studies using similar methodology. However, the attenuation provided by the Audiocup enclosures was considerably less, in the lower frequencies, than reported in two other studies. ANSI S3.1-1977 supra-aural earphone cushion attenuation values, which were determined using pure-tones presented in a free-field, should be replaced by earphone cushion attenuation values determined with 1/3 octave bands of noise presented in a diffuse sound field.

ISSN:0196-0202    

出版商:OVID    

年代:1990

数据来源: OVID

ISSN:0196-0202    

出版商:OVID    

年代:1990

数据来源: OVID