title: Failure of colour and contrast polarity identification at threshold for detection of motion and global form.
abstract: We used identification at threshold to systematically measure binding costs in two visual modalities. We presented a conjunction of two features as a signal stimulus and concurrently measured detection and identification performance as a function of three threshold variables: duration, contrast and coherence. Discrepancies between detection and identification sensitivity functions demonstrated a consistent processing cost to visual feature binding. Our findings suggest that feature binding is indeed a genuine problem for the brain to solve. This simple paradigm can transfer across arbitrary feature combinations and is therefore suitable to use in experiments addressing mechanisms of sensory integration.
authors.affiliation: School of Psychology, Colour Form Motion Lab, University of Sydney, Sydney, NSW, Australia. kileys@psych.usyd.edu.au
authors.forename: Kiley J
authors.initials: KJ
authors.lastname: Seymour
authors.forename: J
authors.initials: J
authors.lastname: Scott McDonald
authors.forename: Colin W G
authors.initials: CW
authors.lastname: Clifford