Recent evidence suggests that neglect patients seem to have particular problems representing relatively smaller\r\nnumbers corresponding to the left part of the mental number line. However, while this indicates space-based\r\nneglect for representational number space little is known about whether and - if so - how object-based neglect\r\ninfluences number processing.\r\nTo evaluate influences of object-based neglect in numerical cognition, a group of neglect patients and two control\r\ngroups had to compare two-digit numbers to an internally represented standard. Conceptualizing two-digit\r\nnumbers as objects of which the left part (i.e., the tens digit should be specifically neglected) we were able to\r\nevaluate object-based neglect for number magnitude processing.\r\nObject-based neglect was indicated by a larger unit-decade compatibility effect actually reflecting impaired\r\nprocessing of the leftward tens digits. Additionally, faster processing of within- as compared to between-decade\r\nitems provided further evidence suggesting particular difficulties in integrating tens and units into the place-value\r\nstructure of the Arabic number system.\r\nIn summary, the present study indicates that, in addition to the spatial representation of number magnitude, also\r\nthe processing of place-value information of multi-digit numbers seems specifically impaired in neglect patients
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