The meaning of concepts is relational and multidimensional, and should not be understood in terms of some thing that constitutes the content of a concept. For example, the concept chair construed as a pattern of neural activation has meaning in part because that pattern has causal correlations with the world through various kinds of perceptual and motor interactions. Chairs have causal effects on neural activity through sensory processes, and neural activity has causal effects on chairs through brains' ability to direct bodily movements. But it is equally important that the pattern has correlations with other neural patterns, some of which may have little direct connection with perception. For example, it is part of the meaning of the concept of a chair that it is a kind of furniture and can be bought in stores.