A considerable amount of research has shown that inverting a face disrupts the recognition of that faceöan effect which is disproportionate to that of inverting other objects, such as houses or aeroplanes (Yin 1969). There is a variety of evidence to suggest that it is information about the configuration of facial features (their relative arrangement to each other within a face) that is disrupted by inversion, and that inversion is more disruptive to the processing of configural information than to that of featural information. Searcy and Bartlett (1996) found effects of inversion on a simultaneouscomparison task with spatially distorted and featurally distorted faces. Inversion significantly hindered participants' ability to decide, within a given time frame, that a pair of spatially distorted faces were the same or different; but this effect was not found with featurally distorted pairs, and responses made within this time feature (3 s) were longer for detecting configural differences than for detecting featural changes. There is, therefore, evidence to suggest that the processing of upright, normal faces is largely dependent on configural processing, whereas inverted faces are thought to require a more featural means of processing (see also Bartlett and Searcy 1993;Rhodes et al 1993;Lewis and Johnston 1997).It is important to note that, although there is a wide range of evidence to support the notion that two types of encoding öconfigural and featuralöare involved in face perception, a number of different terms have been used to refer to different definitions of these types of information. Terms such as`second-order relational information', configural' information, and`holistic' information have referred to configural information as being the combination of components that make up an individual face (eg Sergent 1984), or the configuration formed by the individual arrangements of facial features (eg Diamond and Carey 1986; Bartlett and Searcy 1993). Nevertheless, featural information is generally regarded as the presence of a particular feature or type of feature and the encoding of these parts independent of their context (Diamond and Carey 1986), whereas configural information is gained from the relative arrangement ofThe effect of rotation on configural encoding in a face-matching task Perception, 2007, volume Abstract. Inversion disrupts encoding of faces because of the disruption of configural encoding as evident in the Thatcher illusion (Thompson 1980, Perception 9 483^484). Here we consider the effect of rotation on the loss of configural encoding in a same/different matching paradigm. Participants decided whether two faces were of the same type (both normal or both Thatcherised) or not, at five angles of rotation (08, 458, 908, 1358, 1808). When the faces were both of the same person, the disruption due to rotation for`same-type' judgments was linear and approximately equal for normal and Thatcherised face pairs. In experiment 2, with different-person face pairs, the effect of rotation was much great...