From cognitive information such as identity and recognition to detecting complex patterns of speech or emotion to gleaning important social cues such as gender, ethnicity, age or health. What does our visual-perceptual system “ see” when we view a face? Prima facie, we see a three-dimensional form, evolving over time, that enables multifaceted social, cognitive and affective perceptions of one another. The 4D Space-Time Perspective of Facial Perception In future, it is recommended that facial stimuli incorporate the 4D space-time perspective with the proposed time-resolved methods. In sum, we have found that higher-order perceptions such as identity, gender, ethnicity, emotion and personality, are critically influenced by 4D characteristics. We delve in-depth to summarize recent studies which have utilized facial stimuli that possess 3D structural and surface cues (geometry, surface and depth) and 4D temporal cues (3D structure + dynamic viewpoint and movement). The following review aims to advance and update facial researchers, on the recent revolution in computer-generated, realistic 4D facial models produced from real-life human subjects. Counterintuitively, over the past few decades of experimental research in psychology, facial stimuli have largely been captured, reproduced and presented to participants with two dimensions (2D), while remaining largely static. Our entire perception of another’s face, whether it be social, affective or cognitive perceptions, is therefore built on a combination of 3D and 4D visual cues. The temporal properties of facial objects are defined by how a 3D facial structure and surface evolves dynamically over time where time is referred to as the fourth dimension (4D). The spatial characteristics of facial objects contain a volume and surface in three dimensions (3D), namely breadth, height and importantly, depth. Characteristically, faces can be defined as biological objects that are four-dimensional (4D) patterns, whereby they have concurrently a spatial structure and surface as well as temporal dynamics. Facial information is a powerful channel for human-to-human communication.
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