OPAM 2007 - Object Perception, Attention, and Memory 2007: Conference Abstracts

Haladjian, Montemayor, & Pylyshyn (2007). Segregating targets and nontargets in depth eliminates inhibition of nontargets in Multiple Object Tracking. Talk presented at the 15th Annual Object Perception, Attention, and Memory (OPAM) Meeting of the Psychonomic Society, Long Beach, CA (11/07). [download PDF]

In a typical Multiple Object Tracking (MOT) display of identical objects, inhibition occurs on task-irrelevant objects (nontargets). Using a probe-dot detection task during MOT, we tested inhibition of nontargets that are preattentively separable from target objects by being at different stereovision depth (Nakayama, 2002). The probe detection results from this current experiment support our hypothesis: nontargets on a depth plane different from targets are preattentively removed from the MOT task and are not inhibited. Superior probe detection was observed on front-plane targets and back-plane nontargets; probe detection on front-plane nontargets was significantly lower.

Montemayor, Haladjian, & Pylyshyn (2007). Simultaneous and sequential presentations for object selection and memory recall. Poster presented at the 15th Annual OPAM Meeting of the Psychonomic Society, Long Beach, CA (11/07). [download PDF]

Previous results on Multiple Object Tracking (MOT) show that the mechanism responsible for selecting and tracking objects does not encode properties of these objects (Pylyshyn, 2004). In contrast, VSTM’s main function is to store information about visual percepts. However, in spite of their apparent functional disassociation, these mechanisms must interact at a fundamental level because selection and tracking involve updating some information in real time. In this experiment we show that the process of selecting objects operates with different spatio-temporal constraints than the process of memory encoding in VSTM. This suggests that VSTM does not determine object selection processes.

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