 If functional characterizations of intentional states are intended to capture their “narrow contents”, however, then the inputs and outputs of the system will have to be specified in a way that permits individuals in different environments to be in the same intentional state. On this view inputs and outputs may be better characterized as activity in specific sensory receptors and motor neurons. But this (“short-arm”) option also restricts the range of individuals that can share our beliefs and desires, since creatures with different neural structures will be prevented from sharing our mental states, even if they share all our behavioral and inferential dispositions. (In addition, this option would not be open to analytic functionalist theories, since generalizations that link mental states to neurally specified inputs and outputs would not, presumably, have the status of conceptual truths.)