Schlenker, P: to appear, "Iconic Agreement". Invited commentary on Lillo-Martin and Meier's "On the linguistic status of 'agreement' in sign language". Theoretical Linguistics 37, 3-4: 223–234.

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bstract:   We suggest that that two apparently contradictory insights about sign language can be made compatible within a formal semantic analysis: (i) the claim that directional verbs incorporate agreement markers/pronouns (e.g. Lillo-Martin and Meier 2011); (ii) the observation that directional verbs have an iconic component (e.g. Liddell 2003). We sketch formal rules that integrate  iconic requirements with standard semantic conditions (be they presuppositional or assertive).