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Spatial-numerical association of response codes
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<h2 id="effects">Effects</h2> <p>The SNARC has been observed primarily in two scenarios: attentional and <a href="/facts/Oculomotor/eu6TGIoI">oculomotor</a>. The first of these involves people being faster to detect left probes after smaller numbers are shown and right probes after large numbers,<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> whereas the oculomotor effects are seen when participants look at greater speeds towards the left after detecting small numbers and to the right after detecting large ones.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> </p><p>Newer research shows a motor bias to also be associated with the SNARC effect. In an experiment conducted into <a href="/facts/Random_number_generation/RtXEfbzd">random number generation</a>, participants tended to generate numbers of a larger magnitude when turning their heads to the right, and numbers of a smaller magnitude when turning their heads to the left.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> This has been replicated using hand sizes: smaller distances between the index finger and thumb when generating a random number evoked smaller numbers, and larger spaces evoked larger numbers.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Dehaene, S., Bossini, S., & Giraux, P. (1993). The mental representation of parity and number magnitude. Journal of Experimental Psychology: General, 122, 371–396. <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Fias, W., Brysbaert, M., Geypens, F., & D'Ydewalle, G. (1996). The importance of magnitude information in numerical processing: Evidence from the SNARC effect. Mathematical Cognition, 2, 95–110. <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Fischer, M. (2003). Spatial representations in number processing: Evidence from a pointing task. Visual Cognition, 10, 493–508. <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Fischer, M. H., Warlop, N., Hill, R. L., & Fias, W. (2004). Oculomotor bias induced by number perception. Experimental Psychology, 51, 91–97. <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Loetscher, T., Schwarz, U., Schubiger, M., & Brugger, P. (2008). Head turns bias the brain’s internal random generator. Current Biology, 18(2), R60–R62. <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Andres, M., Davare, M., Pesenti, M., Olivier, E., & Seron, X. (2004). Number magnitude and grip aperture interaction. NeuroReport, 15, 2773–2777. <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> </ol>