The role of parity, physical size, and magnitude in numerical cognition: The SNARC effect revisited

People indicate the physical size or the parity status of small numbers faster by a left-hand key and those of larger numbers by a right-hand key. Because magnitude information is not required for successful performance in these tasks, the presence of a number-space association (the SNARC effect) has been taken to indicate the automatic activation of numerical magnitude in all tasks with numerals. In order to test this account, in a series of five experiments, we derived two consensual markers of automatic activation of irrelevant numerical magnitude, the size congruity effect (for judgments of physical size), and the Garner effect (for judgments of parity). Both markers were found independent of the SNARC effect. Consequently, we question the traditional explanation of the SNARC effect and offer an alternative account in terms of a highly overlearned stimulus-response loop.

[1]  Takeshi Hatta,et al.  Spatial structure of quantitative representation of numbers: Evidence from the SNARC effect , 2004, Memory & cognition.

[2]  Peter Brugger,et al.  Stimulus-response compatibility in representational space , 1998, Neuropsychologia.

[3]  S. Schweinberger,et al.  Asymmetric relationships among perceptions of facial identity, emotion, and facial speech. , 1998, Journal of experimental psychology. Human perception and performance.

[4]  W. Banks,et al.  Semantic congruity effects in comparative judgments of magnitudes of digits. , 1976 .

[5]  J. L. Myers,et al.  Regression analyses of repeated measures data in cognitive research. , 1990, Journal of experimental psychology. Learning, memory, and cognition.

[6]  R. Melara,et al.  Selective attention to Stroop dimensions: Effects of baseline discriminability, response mode, and practice , 1993, Memory & cognition.

[7]  Wim Fias,et al.  The mental representation of ordinal sequences is spatially organized , 2003, Cognition.

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

[9]  W. Fias.  The Importance of Magnitude Information in Numerical Processing: Evidence from the SNARC Effect , 1996 .

[10]  W. Schafer,et al.  Oxygen Homeostasis: How the Worm Adapts to Variable Oxygen Levels , 2008, Current Biology.

[11]  D. Algom,et al.  Stroop and Garner effects in comparative judgment of numerals: The role of attention. , 1999 .

[12]  J. Gibson.  The Ecological Approach to Visual Perception , 1979 .

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

[14]  D. Algom,et al.  Size congruity effects with two-digit numbers: Expanding the number line? , 2006, Memory & cognition.

[15]  G. Logan.  Toward an instance theory of automatization. , 1988 .

[16]  W. R. Garner.  The Processing of Information and Structure , 1974 .

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

[18]  S. Dehaene,et al.  The Number Sense: How the Mind Creates Mathematics. , 1998 .

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

[20]  Tzvi Ganel,et al.  Visual coding for action violates fundamental psychophysical principles , 2008, Current Biology.

[21]  Avishai Henik,et al.  Automatic and intentional processing of numerical information , 1992 .

[22]  G. Logan,et al.  Magnitude versus parity in numerical judgements: event-related brain potentials implicate response conflict as the source of interference. , 1996, Acta psychologica.

[23]  D. Algom,et al.  The perception of number from the separability of the stimulus: The Stroop effect revisited , 1996, Memory & cognition.

[24]  D. Algom,et al.  Driven by information: a tectonic theory of Stroop effects. , 2003, Psychological review.

[25]  M. Goodale,et al.  The visual brain in action , 1995 .

[26]  John E. Laird,et al.  Stimulus-Response Compatibility , 1986 .

[27]  M. Goodale,et al.  Visual control of action but not perception requires analytical processing of object shape , 2003, Nature.

[28]  D. A. Taylor,et al.  The cuing and priming of cognitive operations. , 1987, Journal of experimental psychology. Human perception and performance.

[29]  Martin H. Fischer,et al.  Spatial representations in number processing--evidence from a pointing task , 2003 .

[30]  Daniel Algom,et al.  Comparative judgment of numerosity and numerical magnitude: attention preempts automaticity. , 2002, Journal of experimental psychology. Learning, memory, and cognition.

[31]  W. Fias,et al.  Semantic Influences on Feature-Based Attention Due to Overlap of Neural Circuits , 2002, Cortex.

[32]  A memory-based account of automatic numerosity processing , 2005, Memory & cognition.

[33]  Wim Fias,et al.  The Mental Representation of Ordinal Sequences is Spatially Organised: Evidence from Days of the Week , 2004, Cortex.

[34]  M. H. Fischer,et al.  Number processing induces spatial performance biases , 2001, Neurology.

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

[36]  W Fias,et al.  Two routes for the processing of verbal numbers: evidence from the SNARC effect , 2001, Psychological research.

[37]  ROBERT S. MOYER,et al.  Time required for Judgements of Numerical Inequality , 1967, Nature.

[38]  Y. Goshen-Gottstein,et al.  Perceptual integrality of sex and identity of faces: further evidence for the single-route hypothesis. , 2002, Journal of experimental psychology. Human perception and performance.

[39]  M. Brysbaert.  Arabic number reading: On the nature of the numerical scale and the origin of phonological recoding. , 1995 .

[40]  S. Dehaene,et al.  Is numerical comparison digital? Analogical and symbolic effects in two-digit number comparison. , 1990, Journal of experimental psychology. Human perception and performance.