It has been found that distortion product otoacoustic emissions (DPOAE’s) have provided the most information for detecting mild hearing loss in high frequencies when compared to transient evoked otoacoustic emissions (TEOAE). This is an indication that DPOAE’s can help with detecting an early onset of noise-induced hearing loss. A study measuring audiometric thresholds and DPOAEs among individuals in the military showed that there was a decrease in DPOAEs after noise exposure, but did not show a shift in audiometric threshold. This supports OAEs as predicting early signs of noise damage.
Spontaneous otoacoustic emissions (SOAE)s are sounds that are emitted from the ear without external stimulation and are measurable with sensitive microphones in the external ear canal. At least one SOAE can be detected in approx. 35-50% of the population. The sounds are frequency-stable between 500 Hz and 4500 Hz to have unstable volumes between -30 dB SPL and +10 dB SPL. The majority of the people are unaware of their SOAEs; portions of 1-9% however perceive a SOAE as an annoying tinnitus.
In conjunction with audiometric testing, OAE testing can be completed to determine changes in the responses. Studies have found that exposure to noise can cause a decline in OAE responses. In a study, industrial workers who were exposed to 84.5 dBA of noise were compared to workers who were exposed to 53.2 dBA of noise by considering hearing thresholds and OAEs before and after 5 days of work. This study revealed that hearing thresholds and OAE results were significantly lower among the workers who were exposed to higher levels of noise.
The Nourishing Traditions Book of Baby & Child Care makes the principles of traditional nutrition available to modern parents. The book provides holistic advice for pregnancy and newborn interventions, vaccinations, breastfeeding and child development, as well as a compendium of natural treatments for childhood illnesses, from autism to whooping cough. The work of Rudulf Steiner supports the book's emphasis on the child's spiritual requirement for imaginative play.
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Our dedicated teachers encourage students to be active and creative explorers, as well as independent, self-confident learners. In fact, at Cadence Academy Preschool, Smoky Hill, every student is treated as an individual and able to progress at his or her natural ability while still reaching desired age-level goals. In addition to core curriculum offered for preschool and Pre-Kindergarten children, we provide before and after care for school-age children.