title: Motion-induced blindness measured objectively.
abstract: During central fixation, a moving pattern of nontargets induces repeated temporary blindness to even salient peripheral targets: motion-induced blindness (MIB). Hitherto, behavioral measures of MIB have relied on subjective judgments. Here, we offer an objective alternative that builds on earlier findings regarding the effects of MIB on the detectability of physical target offsets. We propose a small modification of regular MIB displays: Following a variable duration (lead time), one of the targets is physically removed. Subjects are to respond immediately afterward. We hypothesize that illusory target offsets, caused by MIB, are mistaken for physical target offsets and that errors should thus increase with lead time. Indeed, for both nonsalient and salient targets, we found that detection accuracy for physical target offsets dramatically decreased with lead time. We conclude that target offset detection accuracy is a valid objective measure of MIB. With our method, effects of guessing are minimal, and the fitting of psychometric functions is straightforward. In principle, a staircase extension--for more efficient data collection--is also possible.
authors.affiliation: Dipartimento di Psicologia Generale, Università di Padova, Via Venezia 8, 35131, Padova, Italy. peter.kramer@unipd.it
authors.forename: Peter
authors.initials: P
authors.lastname: Kramer
authors.forename: Stefano
authors.initials: S
authors.lastname: Massaccesi
authors.forename: Luca
authors.initials: L
authors.lastname: Semenzato
authors.forename: Stefano
authors.initials: S
authors.lastname: Cecchetto
authors.forename: Paola
authors.initials: P
authors.lastname: Bressan
mesh_terms: D000328:Adult; D001364:Awareness / Q000502:physiology; D001766:Blindness / Q000175:diagnosis* / Q000503:physiopathology; D002138:Calibration; D003626:Data Display; D053483:Eye Movement Measurements; D005260:Female; D005403:Fixation, Ocular / Q000502:physiology*; D006801:Humans; D008297:Male; D009038:Motion; D009903:Optical Illusions; D010470:Perceptual Masking / Q000502:physiology*; D055815:Young Adult