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The adequate stimulus is a property of a sensory receptor that determines the type of energy to which a sensory receptor responds with the initiation of sensory transduction. Sensory receptor are specialized to respond to certain types of stimuli. The adequate stimulus is the amount and type of energy required to stimulate a specific sensory organ.〔Frings 2012, p. 7〕 Many of the sensory stimuli are categorized by the mechanics by which they are able to function and their purpose. Sensory receptors that are present within the body typically are made to respond to a single stimulus. Sensory receptors are present all throughout the body, and they take a certain amount of a stimulus to trigger these receptors. The use of these sensory receptors allows the brain to interpret the signals to the body which allow a person to respond to the stimulus if the stimulus reaches a minimum threshold to signal the brain. The sensory receptors will activate the sensory transduction system which will in turn send an electrical or chemical stimulus to a cell, and the cell will then respond with electrical signals to the brain which were produced from action potentials.〔Frings 2012, p. 7〕 The minuscule signals, which result from the stimuli, enter the cells must be amplified and turned into an sufficient signal that will be sent to the brain.〔Frings 2012, p. 8〕 A sensory receptor's adequate stimulus is determined by the signal transduction mechanisms and ion channels incorporated in the sensory receptor's plasma membrane. Adequate stimulus are often used in relation with sensory thresholds and absolute thresholds to describe the smallest amount of a stimulus needed to activate a feeling within the sensory organ. == Categorizations of receptors == They are categorized through the stimuli to which they respond. Adequate stimulus are also often categorized based on the their purpose and locations within the body. The following are the categorizations of receptors within the body: *Visual – These are found in the visual organs of species and are responsive to stimuli such as light and often consist of light sensitive molecules that enable certain species to have the ability to see the world in with they live.〔Frings 2012, p. 14〕 *Olfaction – These types of receptor sense are activated in order to sense the external molecules that enter the nasal organ and attach to the receptors which will interpret the stimuli and send the signal containing information about the stimuli to the brain.〔Wolfe 2015, 427-429〕 *Auditory – These types of receptors are often found with in the organs used to hear and are responsive to vibrations within the surrounding areas, and they often allow their owners to understand information about sound waves traveling through the aid.〔Frings 2012, p. 10-11〕 *Vestibular – These types of receptors are usually found within organs used to hear, and they aid in the detection of movement that surrounds the creature using it.〔Frings 2012, p. 10-11〕 *Gustatory – These sensory receptors are present within the mouth and are responsive to the molecular stimuli that enter the mouth.〔Wolfe 2015, p. 471〕 The receptors in the mouth typically fall into two of the following categories: receptors that are responsive to specific chemicals and receptors that are responsive to particles such as hydrogen ions, which are charged.〔Wolfe 2015, p. 392〕 *Tactile – These types of receptors are normally present within the skin and are able to respond to stimulation such as heat, pressure,and movement 〔Walker 2008, p. 46〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Adequate stimulus」の詳細全文を読む スポンサード リンク
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