What is the missing reagent in the reaction below? 
Definitions:
Ambiguous Stimuli
Items or situations that lack clear interpretation or can be understood in more than one way, often used in psychological experiments to study perception and cognition.
Brain-Imaging Techniques
Methods used in neuroscience to visualize the structure and function of the brain, such as MRI and PET scans.
Brain Abnormalities
Refers to structural or functional deviations in the brain that differ from the typical pattern, which may impact health and behavior.
Validity
Validity refers to the extent to which a test measures what it is supposed to measure.
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