This article introduces the theory of cognitive spacetime. This account allows us to go beyond the space–time dichotomy that is commonly employed in psychology and cognitive science. Linguistic analysis and experimental review is provided to support the notion that what is commonly referred to as spatial cognition (or mental space) in the cognitive sciences always contains time, and that what is commonly referred to as temporal cognition (or mental time) always contains space. For “spatial cognition” the term object-spatiotemporal cognition (or (...) object spacetime) and for “temporal cognition” the term event-spatiotemporal cognition (or event spacetime) is introduced. In order to exemplify the virtue of the new spacetime account (with its two subdomains, object spacetime and event spacetime) with a specific example, it is investigated how this new notion can substantially refine our understanding of space–time conceptual metaphor. A new conceptual-metaphor spacetime typology for cognitive processing underlying fictive motion and non-fictive motion is also proposed. Implications of the new spacetime account are discussed for metaphorically mapped mental perspective, metaphorically mapped embodiment, and cognitive science in general. Finally, specific reasons are given why the current proposal of cognitive spacetime cannot be equated with the concept of spacetime in modern physics. (shrink)

Several reaction time (RT) studies report faster responses when responses to temporal information are arranged in a spatially congruent manner than when this arrangement is incongruent. The resulting space–time congruency effect is commonly attributed to a culturally salient localization of temporal information along a mental timeline (e.g., a mental timeline that runs from left to right). The present study aims to provide a compilation of the published RT studies on this time–space association in order to estimate the size of its (...) effect and the extent of potential publication bias in this field of research. In this meta-analysis, three types of task are distinguished due to hitherto existing empirical findings. These findings suggest that the extent to which time is made relevant to the experimental task has a systematic impact on whether or not the mental timeline is activated. The results of this meta-analysis corroborate these considerations: First, experiments that make time a task-relevant dimension have a mean effect size of d = 0.46. Second, in experiments in which time is task irrelevant, the effect size does not significantly deviate from zero. Third, temporal priming studies have a surprisingly high mean effect size of d = 0.47, which, however, should be adjusted to d = 0.36 due to publication bias. (shrink)