A stimulus (plural: stimuli) refers to any physical or sensory input from the environment that elicits a response or reaction from someone. It can be any sensory information, such as sound, light, touch, taste, or smell, that triggers a biological or behavioural response. Stimuli can range from simple to complex and can have varying degrees of intensity or duration. They play a crucial role in sensory processing, perception, and learning, providing the necessary information for people to interact with and adapt to their surroundings.
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