Breaking Ranks: Space and Number May March to the Beat of a Different Drum

Number processing can evoke spatial representations and cause lateralized attention shifts. The article by Wood et al. suggests interesting considerations about the mental space of numbers by pointing to a difference between physical and numerical space processing. We read Wood et al.'s findings in a perspective that takes into consideration a currently debated issue, that is the relation between Simon and SNARC effects. By pointing to a difference between peripheral onsets and numerical targets, indeed, their finding suggests that the hypothesis of a complete overlap between Simon and SNARC effects is less plausible than a partial overlap hypothesis.

[1]  Rob H. J. van der Lubbe,et al.  Interruption from irrelevant auditory and visual onsets even when attention is in a focused state , 2005, Experimental Brain Research.

[2]  Wolf Schwarz,et al.  Moving the eyes along the mental number line: Comparing SNARC effects with saccadic and manual responses , 2004, Perception & psychophysics.

[3]  J. Brožek.  Attention and Performance II. , 1971 .

[4]  Wim Fias,et al.  Towards a common processing architecture underlying Simon and SNARC effects , 2005 .

[5]  Guilherme Wood,et al.  Crossed Hands and the Snarc Effect: Afailure to Replicate Dehaene, Bossini and Giraux (1993) , 2006, Cortex.

[6]  W Fias,et al.  Irrelevant digits affect feature-based attention depending on the overlap of neural circuits. , 2001, Brain research. Cognitive brain research.

[7]  Carlo Umiltà,et al.  Attention shifts produce spatial stimulus codes , 1994, Psychological research.

[8]  L. G. Gawryszewski,et al.  What is crossed in crossed-hand effects? , 1986 .

[9]  Brian Butterworth,et al.  The Mathematical Brain , 1999 .

[10]  E. Lauber,et al.  Conditional and unconditional automaticity: a dual-process model of effects of spatial stimulus-response correspondence. , 1994, Journal of experimental psychology. Human perception and performance.

[11]  Colin M. Macleod.  Half a century of research on the Stroop effect: an integrative review. , 1991, Psychological bulletin.

[12]  J. R. Simon,et al.  Auditory S-R compatibility: the effect of an irrelevant cue on information processing. , 1967, The Journal of applied psychology.

[13]  W. Schwarz,et al.  Psychophysiological evidence that the SNARC effect has its functional locus in a response selection stage. , 2005, Brain research. Cognitive brain research.

[14]  Saul Sternberg,et al.  The discovery of processing stages: Extensions of Donders' method , 1969 .

[15]  Giovanni Galfano,et al.  Number magnitude orients attention, but not against one’s will , 2006, Psychonomic bulletin & review.

[16]  Carlo Umiltà,et al.  Egocentric and relative spatial codes in S-R compatibility , 1987 .

[17]  C. Umilta,et al.  Compatibility due to the coding of the relative position of the effectors. , 1984, Acta psychologica.

[18]  Roberto Nicoletti,et al.  Spatial stimulus-response compatibility. , 1990 .

[19]  Daniela Mapelli,et al.  The SNARC effect: an instance of the Simon effect? , 2003, Cognition.

[20]  W. Schwarz,et al.  Searching for the functional locus of the SNARC effect: Evidence for a response-related origin , 2005, Memory & cognition.

[21]  A. Kingstone,et al.  The number line effect reflects top-down control , 2006, Psychonomic bulletin & review.

[22]  Daniela Mapelli,et al.  Automatic spatial coding of perceived gaze direction is revealed by the Simon effect , 2003, Psychonomic bulletin & review.

[23]  Vincent Walsh.  A theory of magnitude: common cortical metrics of time, space and quantity , 2003, Trends in Cognitive Sciences.

[24]  M. Tlauka.  The processing of numbers in choice‐reaction tasks , 2002 .

[25]  Robert W. Proctor,et al.  Stimulus-Response Compatibility: An Integrated Perspective , 1990 .

[26]  S. Kornblum,et al.  Stimulus-response compatibility with relevant and irrelevant stimulus dimensions that do and do not overlap with the response. , 1995, Journal of experimental psychology. Human perception and performance.

[27]  S. Dehaene,et al.  THREE PARIETAL CIRCUITS FOR NUMBER PROCESSING , 2003, Cognitive neuropsychology.

[28]  Xun Liu,et al.  Common and distinct neural substrates of attentional control in an integrated Simon and spatial Stroop task as assessed by event-related fMRI , 2004, NeuroImage.

[29]  C. Umilta,et al.  Two orienting mechanisms in posterior parietal lobule: An rTMS study of the Simon and SNARC effects , 2007, Cognitive neuropsychology.

[30]  Michael D. Dodd,et al.  Perceiving numbers causes spatial shifts of attention , 2003, Nature Neuroscience.

[31]  Rolf Verleger,et al.  Validity and boundary conditions of automatic response activation in the Simon task. , 2001, Journal of experimental psychology. Human perception and performance.

[32]  Wim Fias,et al.  Numbers and space: a computational model of the SNARC effect. , 2006, Journal of experimental psychology. Human perception and performance.

[33]  S. Dehaene,et al.  The mental representation of parity and number magnitude. , 1993 .

[34]  A. Osman,et al.  Dimensional overlap: cognitive basis for stimulus-response compatibility--a model and taxonomy. , 1990, Psychological review.