Undoubtedly, this approach assumes the existence of a prototypical face and the possibility to create novel, unique and cognitive representations for each face. Finally, the second-order relations are identified which require information on relative position, size and colour of face elements. Then, the key elements of the perceived stimulus are processed holistically (as gestalt), which forms a single face image. Initially, the stimulus is assigned to the appropriate first-order relations. The approach postulates three types of configural processing. The concept of configural processing particularly accentuates the relations between individual parts of the face. The neural system responsible for processing the changeable aspects of faces, such as eye gaze, lip movement, spatially directed attention, prelexical speech and emotional expression, is more complex and includes such key structures as the superior temporal sulcus, the intraparietal sulcus, the auditory cortex, the amygdala, the insula and the limbic system. These aspects are processed primarily by the lateral fusiform gyrus and anterior temporal regions.

In an interaction, they may serve as cues to determine personal details, certain biographic aspects or unique identifiers. The invariant aspects of faces are of genetic origin, and as such are predetermined by widely understood inheritance. This model differentiates between the invariant and changeable aspects of faces. Face processing involves a number of distributed cerebral structures, which enable person identification. On the other hand, the Haxby model 7 emphasises neural systems of face perception. However, the situation is completely different when a person is familiar, as only person identity nodes are activated then at all stages of face processing. It should be noted that even if a person is unknown, some person identity nodes may still be activated for instance, it is still possible to determine their sex, age, health condition, ethnicity or intelligence. physical features, voice and speech, and clothing items). The face recognition units and person identity nodes are markedly different which becomes particularly obvious during the exposure to various input structural codes (e.g. The Bruce and Young’s model indicates that face processing may lead to face recognition and person identification. the underlying neural processes: the Bruce and Young model of face recognition, the Haxby model and the concept of configural processing by Maurer, Le Grand and Mondloch. Currently, there are three main research and applied concepts to explain these algorithms by means of e.g. 1, 2, 3īefore a set of facial cues becomes a social message playing an important role in interaction, these have to undergo complex processing algorithms. Both invariant and changeable aspects of face are perceived by others who can ascribe different meanings to them. An exceptionally complex object which constantly changes in response to the external stimuli, whilst maintaining fixed elements to ensure its physical configuration and physiognomy, a human face is a significant contributor to human interaction.

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