CRT tasks can  involve stimuli of any sensory modality, most typically of visual or auditory nature, and require responses that are typically indicated by pressing a key or button , but can also be vocalizations . For example, the subject might be asked to press one button if a red light appears and a different button if a yellow light appears. The Jensen box is an example of an instrument designed to measure choice RT  .
CRT tasks can be highly variable. They can involve stimuli of any sensory modality, most typically of visual or auditory nature, and require responses that are typically indicated by pressing a key or button . For example, the subject might be asked to press one button if a red light appears and a different button if a yellow light appears. The Jensen box is an example of an instrument designed to measure choice RT with visual stimuli and keypress response. Response criteria can also be in the form of vocalizations, such as the original version of the Stroop task, where participants are instructed to read the names of words printed in colored ink from lists. Modern versions of the Stoop task, which use single stimulus pairs for each trial, are examples of a multi-choice CRT paradigm with vocal responding .
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be highly variable. They can
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, but can also be vocalizations
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with visual stimuli and keypress response. Response criteria can also be in the form of vocalizations, such as the original version of the Stroop task, where participants are instructed to read the names of words printed in colored ink from lists. Modern versions of the Stoop task, which use single stimulus pairs for each trial, are examples of a multi-choice CRT paradigm with vocal responding