Previous research has shown that retrospective gaze cues direct attention to internally maintained representations in visual working memory (vWM). Here, we aimed to differentiate the dual nature of gaze and accordingly proposed two hypotheses regarding the gaze-induced prioritization in vWM. The directional cueing hypothesis claims a constant attentional shifting to the gazed-at direction. By contrast, the referential cueing hypothesis proposes that gaze cues selectively orient attention toward their referents. To test these hypotheses, we employed an adapted change-detection task wherein gaze cues were presented during the retention interval. Critically, the cue character was positioned between two barriers, which could be either opaque (the blocked condition) or transparent (the unblocked condition). Polygons previously presented at the gazed-at (vs. gazed-away) location were better memorized, but not when the visual perspective of the character was obstructed (i.e., the blocked condition, Experiment 1). Subsequent experiments demonstrated that physical motion cues (Experiment 2) and inverted face cues (Experiment 3), which disrupted the extraction of referential signals, were immune to barrier settings. In Experiment 4, we generalize this selective cueing effect to faces with fearful expressions. These consistent findings support the referential cueing hypothesis and emphasize the distinctiveness of social attention.
Public Significance StatementFrom others' eye gaze, humans can not only determine their looking direction but also read what they are referring to. The present study demonstrates that by manipulating the visual perspective of the gazer, when the target is not visible to the gazer, rendering the observed direction devoid of reference, observers do not shift their attention to the indicated locations. In the current scenario, the target is retained in working memory but remains invisible externally. Consequently, the gazer appears to be looking at "nothing," prompting the observer to infer what the gazer had seen before and subsequently modulate the representations in the mind. The study highlights humans' ability to intricately model the gazes of others.