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The present study raises considerations regarding constancy of the PI of happy and angry facial expressions at varied distances.Įmotional facial expressions are a vital part of the human non-verbal communicative system. It helps motivate actions and guide behavior. We are frequently confronted with facial expressions and many aspects of this type of socioemotional communication have been well documented in previous research, such as the ability to discriminate and categorize facial expressions ( Etcoff and Magee, 1992 Young et al., 1997 Fugate, 2013), the cultural universality or diversity of facial expressions ( Ekman et al., 1987 Jack et al., 2012) and how facial expressions evoke emotions in the perceiver ( Wild et al., 2001). However, research into whether capability to interpret socioemotional information is dependent on the ability to recognize emotional facial expressions, regardless of whether seen from an angle ( Matsumoto and Hwang, 2011 Skowronski et al., 2014) or from a distance ( Du and Martinez, 2011 Guo, 2013), is surprisingly scarce. When perceiving a familiar object the characteristics of that object are recognized irrespective of the situation in which it is perceived ( Kulikowski and Walsh, 1998). For example, when a known object is presented from a rare angle or at a distance we usually perceive it as the same object even though the retinal image differs from our general representation of that object. The ability to estimate, without effort, the true size of objects irrespective of their retinal size is called size constancy ( Kulikowski and Walsh, 1998 Wagner, 2012).
