Amplified inversion effects for moving biological stimuli remain largest for faces and bodies

Abstract

Turning an object upside-down disrupts our ability to perceive it accurately, and this inversion effect is disproportionately larger for faces and whole bodies than most other objects. This disproportionate inversion effect is taken as an indicator of holistic processing for these stimuli. Large inversion effects are also found when viewing motion-only information from faces and bodies; however, these have not been compared to other moving objects in an identity task so it is unclear whether inversion effects remain disproportionately larger for faces and bodies when they are engaged in motion. The current study investigated the effect of inversion on static and moving unfamiliar faces, human bodies, and German Shepherd dogs in an old-new recognition memory task. Sensitivity and baseline corrected reaction time (RT) results revealed that inversion effects for faces and whole-bodies remained disproportionately larger than those for German Shepherd dogs, regardless of presentation type, suggesting that both static and moving faces and bodies are processed holistically.