Many philosophers respond to such worries by promoting content internalism. Whereas content externalists favor wide content (content that does not supervene upon internal neurophysiology), content internalists favor narrow content (content that does so supervene). Narrow content is what remains of mental content when one factors out all external elements. At one point in his career, Fodor (1981, 1987) pursued internalism as a strategy for integrating intentional psychology with CCTM+RTM+FSC. While conceding that wide content should not figure in scientific psychology, he maintained that narrow content should play a central explanatory role.