 In the 1970s, LOTH underwent a dramatic revival. The watershed was publication of Jerry Fodor’s The Language of Thought (1975). Fodor argued abductively: our current best scientific theories of psychological activity postulate Mentalese; we therefore have good reason to accept that Mentalese exists. Fodor’s analysis exerted tremendous impact. LOTH once again became a focus of discussion, some supportive and some critical. Debates over the existence and nature of Mentalese continue to figure prominently within philosophy and cognitive science. These debates have pivotal importance for our understanding of how the mind works.