http://precedings.nature.com/tags/numerosity Recently posted documents tagged with 'numerosity' Nature Publishing Group en Nature Precedings http://precedings.nature.com/images/header_logo.gif http://precedings.nature.com http://precedings.nature.com/documents/2792/version/1 We have recently suggested that numerosity is a primary sensory attribute, showing that it is strongly susceptible to adaptation. Here we use the Method of Single Stimuli (MSS) to show that observers can extract a running average of the numerosity of a succession of stimuli and hold it in mind for use as a standard of comparison for subsequent stimuli. Accuracy and precision of judgments are high and not reduced by potentially misleading variables like texture density or display area. http://precedings.nature.com/documents/2792/version/1 Fri, 16 Jan 2009 16:29:46 UTC Vision senses number directly hdl:10101/npre.2009.2792.1 2009-01-16 David C. Burr Nature Precedings 2009-01-16T16:29:46Z Manuscript Neuroscience http://creativecommons.org/licenses/by/3.0/ http://precedings.nature.com/documents/1353/version/1 Evidence exists for a non-verbal capacity to apprehend number, in humans1 (including infants2,3) and in other primates4-6. Here we show that perceived numerosity is susceptible to adaptation, along with primary visual properties of a scene like colour, contrast, size and speed. Apparent numerosity was decreased by adapting to large numbers of dots and increased by adapting to small numbers, the effect depended entirely on the numerosity of the adapter, not on contrast, size, orientation or pixel density, and occurred with very low adapter contrasts. We suggest that numerosity is also an independent primary visual property, not reducible to others like spatial frequency or density of texture7. http://precedings.nature.com/documents/1353/version/1 Tue, 20 Nov 2007 12:32:03 UTC A visual sense of number hdl:10101/npre.2007.1353.1 2008-04-22 David Burr Nature Precedings 2007-11-20T12:32:03Z Manuscript Neuroscience http://creativecommons.org/licenses/by/3.0/