Change Blindness Essay Example

dimension, with multiple cross points, and thus there may be no level or neutral point that is special. Multiple-channel codes of this type are found for some low-level stimulus dimensions such as spatial frequency and may also underlie some aspects of face perception including the direction of gaze Norm-based coding provides an effective solution to the problem of representing visual patterns which all share a common structure which must be distinguished by very subtle variations that define ndividuals.

Average face at centre of space (prototype) and faces are arranged based on similarity to prototype. Similar faces clustered together, explaining why distinctive faces are recognised quicker. It is an efficient way of coding visual patterns that share a common structure and must be distinguished by subtle variations that define Individuals. used by adults and children for coding face identity- but not known If pre-school children do. A norm-based system represents what Is distinctive about each face by coding how aces deviate from a perceptual norm or prototype.

This system may be more efficient than one that codes a complete structural description, most elements of which are shared by all faces and therefore redundant. Moreover, face norms are updated by experience, fine-tuning our face perception coding mechanisms to our diet of faces. A variety of behavioural and neurophysiological evidence supports use of norm-based coding for facial identity in adults. However, absolute-based coding allows a face to be averaged but the average has no place in the coding process.

The rocess involved encoding a stimulus face as a location in the multidimensional space (face space) and determining whether this location matches that of a known face. It is however not without

errors, errors here could depend on viewing time and inversion etc. Matching could be affected by magnitude of error and the proximity of nearby faces. These factors affect the probability that a new face will match the location of a known face and give rise to a false positive response.