Evidence from Oromo on the typology of complementation strategies

This paper explores the clausal complementation strategies found in Oromo (Cushitic). Recent work by Wurmbrand and Lohninger (2019) suggests that languages distinguish three broad semantic categories of complement clauses, which are hierarchically ordered with respect to their syntactic complexity. Based on newly elicited data and examples from the literature, I propose that Oromo complement clauses also show this three-way split, lending support to Wurmbrand and Lohninger’s (2019) proposal. However, the distribution of clausal complement categories appears to diverge somewhat from what has been reported for other languages, suggesting some flexibility in the way certain states and events can be linguistically encoded. Situating Oromo within the typology of clausal complementation thus sheds light on the diversity of ways in which basic semantic building blocks may be incorporated into the expression of complex meanings and speaks to the import of understudied languages to typological research.

Time, perspective and semantic representation

abstractI discuss the perspectival nature of temporality in discourse and argue that the human concept of time can no more be dissociated from the perspectival thought than the concept of the self can. The corollary of this observation is that perspectival temporality can no more be excluded from the semantic representation than the notion of the self can: neither can be reduced to the bare referent for the purpose of semantic representation if the latter is to retain cognitive plausibility. I present such a semantic qua conceptual approach to temporal reference developed within my theory of Default Semantics. I build upon my theory of time as epistemic modality according to which, on the level of conceptual qua semantic building blocks, temporality reduces to degrees of detachment from the certainty of the here and the now. I also address the questions of temporal asymmetry between the past and the future, and the relation between metaphysical time (timeM), psychological time (timeE, where ‘E’ marks the domain of epistemological enquiry), and time in natural language (timeL), concluding that the perspective-infused timeE and timeL are compatible with timeM of mathematical models of spacetime: all are definable through possibility and perspectivity.

Characterizing Users' Visual Analytic Activity for Insight Provenance

Insight provenance – a historical record of the process and rationale by which an insight is derived – is an essential requirement in many visual analytics applications. Although work in this area has relied on either manually recorded provenance (for example, user notes) or automatically recorded event-based insight provenance (for example, clicks, drags and key-presses), both approaches have fundamental limitations. Our aim is to develop a new approach that combines the benefits of both approaches while avoiding their deficiencies. Toward this goal, we characterize users' visual analytic activity at multiple levels of granularity. Moreover, we identify a critical level of abstraction, Actions, that can be used to represent visual analytic activity with a set of general but semantically meaningful behavior types. In turn, the action types can be used as the semantic building blocks for insight provenance. We present a catalog of common actions identified through observations of several different visual analytic systems. In addition, we define a taxonomy to categorize actions into three major classes based on their semantic intent. The concept of actions has been integrated into our lab's prototype visual analytic system, HARVEST, as the basis for its insight provenance capabilities.