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This study investigates how social context influences the responses of <i>Neohelice granulata</i> to a moving stimulus (dummy) that can be perceived as either prey or predator. It shows that paired crabs, regardless of sex, display lower exploratory activity and a reduced probability of responding to the stimulus compared to solitary crabs, but only when they are within 15 cm of each other. In the presence of a conspecific, crabs initiate escape or predatory responses at shorter distances, suggesting delayed decision-making due to divided attention. In contrast, freezing distance remains unchanged. Overall, the results reveal that social proximity selectively modulates active responses, highlighting an interaction between social context, attention, and decision-making in these crabs.

本研究探究了社会背景如何影响颗粒新相手蟹（Neohelice granulata）对可被视作猎物或捕食者的移动刺激仿真模型的响应。研究结果显示，无论性别如何，成对个体的蟹类相较于独居蟹类，其探索行为活跃度更低，且对刺激物作出响应的概率更低，但该现象仅发生在二者间距不超过15厘米的情况下。当存在同种个体时，蟹类会在更短的距离内启动逃逸或捕食响应，这表明其因注意力分散而出现决策延迟。与之相反，其僵住距离并未发生改变。综合来看，研究结果表明社交亲近度可选择性调控蟹类的主动响应行为，凸显了这类蟹类的社会背景、注意力与决策过程之间的相互作用。