Abduction as a Method of Inductive Metaphysics

Like scientific theories, metaphysical theories can and should be justified by the inference of creative abduction (sec. 1–2). Two rationality conditions are proposed that distinguish scientific from speculative abductions: achievement of unification and independent testability (sec. 3). Particularly important in science is common cause abduction (sec. 4). The justification of metaphysical realism is structurally similar to scientific abductions: external objects are justified as common causes of perceptual experiences (sec. 6). While the reliability of common cause abduction is entailed by a principle of (Markov) causality (sec. 5), the latter principle has an abductive justification based on statistical phenomena (sec. 7).