While autism is highly heritable, researchers suspect both environmental and genetic factors as causes. In rare cases, autism is strongly associated with agents that cause birth defects. Controversies surround other proposed environmental causes; for example, the vaccine hypotheses have been disproven.iagnosis is based on behavior, not cause or mechanism. Under the DSM-5, autism is characterized by persistent deficits in social communication and interaction across multiple contexts, as well as restricted, repetitive patterns of behavior, interests, or activities.
Wiktionary(0.00 / 0 votes)Rate this definition: downsampling(Noun) The process of reducing the sampling rate of a signal. Downsampling. In signal processing, downsampling is the process of reducing the sampling rate of a signal. This is usually done to reduce the data rate or the size of the data.
posted 07-18-2007 09:19 AM ET (US) Porpoising, or the repeated oscillation of the bow of the boat up and down while the boat is on plane, is often seen in boats which seem to be heavy in the stern. There have been reports that porpoising can be eliminated by adding trim tabs. The root cause of a lack of stability in a boat's fore and aft pitching when on plane is probably related to how much of the hull is in contact with the water and the angle the hull makes with the water.