We often refer to space when we talk about time. To support this, studies show that we tend to associate the past with the left and the future with the right, space. However, there is little research that compares the spatial mapping of individual time units within the same methodological framework. Here, we used the same line-bisection paradigm to study horizontal spatial biases in various individual time units (i.e., hours, days, and months). Fifty-four adults processed temporal words and indicated their location on a horizontal line representing a time interval via a mouse click. Each word corresponded to one of the three conditions: left, right, or central position on the line. Our results show a reaction-time facilitation effect for hour and day units in congruent conditions (e.g., left semantic bias + left position on the line). Also, processing hour units shifted the response coordinates in the direction of the presumed spatial bias. Finally, the congruent combination of visual and semantic biases led to a shift in manual responses in the corresponding direction for all time units. We conclude that while left-to-right mapping of time concepts is relatively universal, the horizontal mapping is stronger for hours as compared with days and months.

This theoretical review clarifies the concept of "language attrition " by defining the phenomenological and contextual features of its utilization, discussing the definition of contradictions, and suggesting potential directions for future research. Taking into account existing data, we regard the existing approaches to language attrition and analyze the mechanisms underlying the phenomenon. This analysis seems to be the first step in building up an integral theoretical model summarizing the available empirical data. It helps to apply a neurobiological approach, allowing to identify neural markers of language attrition at different levels of language processing and within different language categories. To this end, we propose specific experimental approaches to recording neural traces of attrition and formulate working hypotheses based on proposed experimental paradigms.

Unlike concrete words related to sensory perception (e.g., hear, sun), abstract words (including the words with temporal semantics, e.g., year, tomorrow) do not have direct embodied sensory correlates. Nevertheless, existing research indicates that abstract concepts’ representations make regular reference to sensorimotor processes, e.g., visual perception. For example, regular expressions such as “the future is ahead” or “the flow of time” are common in different languages reflecting a relatively universal nature of space-time correspondences. Moreover, these regular correspondences are commonly demonstrated in experimental studies; for example — by registering attentional displacement during processing of past and future related words. Here, the main theoretical approaches as well as existing experimental data documenting neurocognitive foundations of space-time representations are reviewed. A detailed overview of research on spatial-conceptual mapping of time concepts in three-dimensional visual space is offered. We also consider features of space-time associations that reflect linguistic and socio-cultural differences. In conclusion, the main areas of current and future that will allow an integration of the existing data within a common theoretical framework are defined.

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