Brain areas giving rise to concepts must be able not only to stimulate parts of past global mappings but also to do so independently of current sensory input. They must also be able to distinguish classes of global mappings (for instance, those corresponding to objects from those corresponding to movements). They must then be able to connect reactivated portions of global mappings and mediate the long-term storage of such activities. This is necessary because concept formation requires memory.
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From the perspective of Systemic Functional Linguistic theory, the formation of concepts through the brain distinguishing classes of global mappings is the material means by which perceptual meanings, construed of experience, are organised into systems of related perceptual meaning, such as the distinction between objects and movements.
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