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instinctive drowning response
The instinctive drowning response is a set of behaviors automatically undertaken by a person who either is, or is very close to, drowning. They are autonomic responses of the body, triggered by the sensation of suffocation in water.〔
Contrary to the normal popularisation of drowning as a highly visible behavior, involving shouting, abrupt or violent movements such as splashing and waving, and visible difficulty — which is a related phenomenon, known as '','' which often but not always precedes drowning — the instinctive drowning response is noiseless and confined to subtle movements.
== Description ==
While distress and panic may sometimes take place beforehand, drowning itself is quick and often silent.〔 A person at, or close to, the point of drowning is unable to keep their mouth above water long enough to breathe properly and is unable to shout.〔 Lacking air, their body cannot perform the voluntary efforts involved in waving or seeking attention. Involuntary actions operated by the autonomic nervous system involve lateral flapping or paddling with the arms to press them down into the water in the effort to raise the mouth long enough to breathe, and tilting the head back.〔 As an instinctive reaction, this is not consciously mediated nor under conscious control.〔
The lack of leg movement, upright position, inability to talk or keep the mouth consistently above water, and (upon attempting to reach the victim) the absence of expected rescue-directed actions, are evidence of the condition.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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