The observation that extinction is worse when identical, rather than different, stimuli are simultaneously presented to the ipsilesional and contralesional sides of the visual field indicates . neglected stimuli do not undergo perceptual processing in the absence of focused attention. b. neglected stimuli undergo perceptual processing in the absence of focused attention. c. neglected stimuli can capture attention involuntarily. d. neglected stimuli are often confused with stimuli that are successfully attended.