Figure 3.

Face feature stimuli The Caledonian face test was administered under the following conditions: (a) full faces—all features vary by equivalent proportions, (b) isolated external features—only the head-shape and hairline are visible, (c) embedded external features—the same stimulus as (b), embedded within an otherwise fixed face context, (d) isolated internal features—only the eyes, nose, mouth, and eyebrows are visible, (e) embedded internal features—the same stimulus as (d), embedded within an otherwise fixed face context, (f) shapes.