Effects of Sound Transmission in An Aqueous And Air Environment On Infant Motor Behavior.

Cover Effects of Sound Transmission in An Aqueous And Air Environment On Infant Motor Behavior.
Effects of Sound Transmission in An Aqueous And Air Environment On Infant Motor Behavior.
Barnett, Harvey, 1948-
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The white noise condition was recorded from a white noise generator. All underwater presentations were recorded so that reasonable fidelity could be achieved when these sound conditions were boosted 50 db to 115 db as calibrated in air. This increase was necessary to make the db level equal for air (65) and underwater conditions (115) .
A single eight movie camera in an underwater housing was used to film the underwater and surface trials. The camera was operated by a direct pressure trigger ve
...ry 41 similar to a mechanical cable release used in various photo- graphic situations. Linked to the trigger was a toggle switch leading to the cassette player. When the camera was operated, sound conditions were automatically presented except in the silence condition. The film used was ASA 25 and ASA 200 with appropriate filters and lenses used for appropriate film documentation. The exposed filn was sent to a professional processing laboratory and returned in 50 foot reels. Immediate inspection revealed all the film was properly focused and exposed suitably for coding.

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