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Cortical Responses

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Cortical Auditory Evoked Potentials Measurements (CAEP) are used to estimate whether sounds are easily detectable by the patient.

A transducer such as an insert earphone, bone vibrator, or sound field speaker is used to deliver test signal to the patient. Electrodes placed on the patient’s head measure the cortical response. A statistical analysis of each response (a “p-value”) is automatically calculated to determine the likeliness that the patient detected the test signal. Cortical Auditory Evoked Potentials Measurements to the audiologist can verify this analysis with a visual examination of the measured cortical response.

Cortical Auditory Evoked Potentials Measurements (CAEP) can be tested on patients who are unable or unwilling to communicate to the clinician about whether they can hear a signal. This could include infants who have not yet developed language skills, and adults who are disabled or uncooperative.

Cortical Auditory Evoked Potentials Measurements tot he relationship between the presence of cortical responses and the audibility of sounds has so far been established only for infants aged 8 to 30 months and for adults aged 43 to 89 years. Cortical measurements are performed when the patient is alert and awake. Adults can be entertained during the test with reading material or a silent DVD. Infants can be entertained with quiet toys.

Computer Speech

Aided Cortical Assessment Module

The Aided Cortical Assessment (ACA) module is used to evaluate whether speech is audible to the wearer of a hearing aid. Three speech stimuli with low (/m/),medium (/g/), and high (/t/) frequency emphasis are presented to the patient in the free-field at input levels ranging from 55 to 75 dB SPL. These signals have a presentation time long enough to activate the compression circuits of a hearing aid, making it an effective tool for determining whether the amplification produced by the hearing aid provides a signal that is actually detectable at the cortical level of the patient. The unaided response of the patient can also be measured, allowing the clinician to compare the unaided and the aided cortical responses.

Cortical Tone Evaluation Module

The Cortical Tone Evaluation (CTE) module provides audiologists with a tool to evaluate the audibility of highly frequency-specific tones in adults who are unable or unwilling to participate in regular pure tone audiometry assessments. Air and bone audio-metric test tones are presented to the patient from 500 to 4000 Hz, 0-110 dB HL (air), and 0-70 dB HL (bone). Masking may be applied to the non-test ear as appropriate.

The CTE Module will not replace standard audio-metric tests produced by a clinical audiometer, but it will provide a great tool that can be used when the stan­dard testing methods are not possible or practical.

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