Input capability and speed of processing in mental retardation.

Contrary to the claims of Stanovich and Purcell, Saccuzzo, Kerr, Marcus, and Brown did not claim to have demonstrated specific deficits in iconic storage in mental retardation but specifically noted that the precise nature of the input limitation could not be specified. Stanovich and Purcell's basic criticism is that Saccuzzo, Kerr, Marcus, and Brown's design does not rule out nonspecific factors that might have contributed to performance differences. Their specific criticisms of the experimental method are discussed. Some are shown to be speculative and others incorrect.