Henderson J M
Department of Psychology, Michigan State University, East Lansing 48824-1117, USA.
J Exp Psychol Hum Percept Perform. 1996 Jun;22(3):780-7. doi: 10.1037//0096-1523.22.3.780.
In 2 earlier sets of experiments, the author reported that shape discrimination in an otherwise empty visual field is facilitated when the target shape is preceded by a valid spatial precue (J. M. Henderson, 1991; J. M. Henderson & A. D. Macquistan, 1993). L. Shiu and H. Pashler (1994) recently suggested that these earlier results were due to the presence of multiple posttarget pattern masks. They concluded that precue effects are observed only when visual noise is present. The author reviews the existing evidence and presents new data supporting the view that spatial precues influence shape discrimination in the absence of visual noise, consistent with a limited capacity conception of visual-spatial attention.
