@article{ref1,
title="Direction information in multiple object tracking is limited by a graded resource",
journal="Attention, perception and psychophysics",
year="2010",
author="Horowitz, Todd S. and Cohen, M. A.",
volume="72",
number="7",
pages="1765-1775",
abstract="Is multiple object tracking (MOT) limited by a fixed set of structures (slots), a limited but divisible resource, or both? Here, we answer this question by measuring the precision of the direction representation for tracked targets. The signature of a limited resource is a decrease in precision as the square root of the tracking load. The signature of fixed slots is a fixed precision. Hybrid models predict a rapid decrease to asymptotic precision. In two experiments, observers tracked moving disks and reported target motion direction by adjusting a probe arrow. We derived the precision of representation of correctly tracked targets using a mixture distribution analysis. Precision declined with target load according to the square-root law up to six targets. This finding is inconsistent with both pure and hybrid slot models. Instead, directional information in MOT appears to be limited by a continuously divisible resource.<p /> <p>Language: en</p>",
language="en",
issn="1943-3921",
doi="10.3758/APP.72.7.1765",
url="http://dx.doi.org/10.3758/APP.72.7.1765"
}