Numerical, spatial and material magnitude estimation in left and right brain-damaged patients

In this study, we tested the main prediction derived from “A Theory Of Magnitude” or ATOM, according to which discrete (e.g., numbers) and continuous space, material) magnitudes are processed within right hemisphere. To do so, examined 11 brain-damaged patients, 19 left 30 healthy subjects on different tasks assessing magnitude estimation: symbolic non-symbolic numerical as well spatial (i.e., length) material weight) magnitude. Contrary ATOM’s predictions, did not find significant correlations between all estimation in patients. Correlations length were found patients subjects. Our results support existence of a partial independence forms processing.