Desenvolvimento de um dispositivo capaz de registrar e analisar potenciais evocados auditivos nos domínios do tempo e das freqüências

Potencial miogênico evocado vestibular e suas implicações no domínio das frequências

“…With respect to the absence of responses in the two domains, observed in four tests, we can establish two hypotheses: the first is that the two subjects in question showed vestibular alterations during some part of the cervical-vestibular reflex trajectory (16,19) ; the second considers the external factors involved in assessing the potential, such as the presence of errors that may have caused the absence of responses, or alterations in the wake state of the patient (9) . In relation to the association between the two domains, it can be inferred, based on the findings of the present study and those contained in the literature, that there is a strong relationship between the two domains, confirming that VEMP can be conducted in the frequency domain without losing the information required for vestibular assessment (10,11) . Establishing an analogy with the steady-state auditory evoked potential (SSAEP), the greatest advantage of the VEMP in the frequency domain is the objective way of assessing responses, which can be done automatically with software.…”

“…Modulating tones can be applied to both ears simultaneously, and the response analyzed by the Fast Fourier Transform, associated to statistical techniques (9,10) . This is a much faster and more accurate test, in terms of compromised frequencies (11) .…”

Padronização do potencial evocado auditivo de tronco encefálico utilizando um novo equipamento

“…Thirty-five of the 76 normal hearers (70 ears) were males and 41 females (82 ears), aged between 18 and 49 years (6). Electrophysiological responses (absolute and interpeak latencies) of the 76 normal hearers (152 ears) belonging to experimental group 1 (EG1), using the new device (ND), were compared according to gender and ear.…”

Triagem auditiva neonatal com potencial evocado auditivo de tronco encefálico automático: a utilização de diferentes tecnologias

“…However, the statistical analyses showed that the time taken in the NHS procedure is influenced by the newborn's state of consciousness. This may be due to the high EEG, which causes noise that might interfere in response detection, since the amplitude is shorter closer to the threshold (9,16) .…”

“…The FFT is one of the manners to make the change from the time domain to the frequency domain, in which a signal is evidenced by its frequency components without losing its initial characteristics. Hence, with this change, it is possible to observe the same phenomenon in different manners (8,10,16) .…”