Causal connectives as indicators of source information: Evidence from the visual world paradigm

Causal relations can be presented as subjective, involving someone's reasoning, or objective, depicting a real-world cause-consequence relation. Subjective relations require longer processing times than objective relations. We hypothesize that the extra time is due to the involvement of a Subject of Consciousness (SoC) in the mental representation of subjective information. To test this hypothesis, we conducted a Visual World Paradigm eye-tracking experiment on Dutch and Chinese connectives that differ in the degree of subjectivity they encode. In both languages, subjective connectives triggered an immediate increased attention to the SoC, compared to objective connectives. Only when the subjectivity information was not expressed by the connective, modal verbs presented later in the sentence induced an increase in looks at the SoC. This focus on the SoC due to the linguistic cues can be explained as the tracking of the information source in the situation models, which continues throughout the sentence.