16:30 - 18:00
Mon-B21-Talk III-
Mon-Talk III-
Room: B21
Chair/s:
Christian Seegelke, Peter Wühr
During the last decades, researchers discovered and investigated a multitude of cross-dimensional S-R compatibility effects between different stimulus and response dimensions, including quantities, valence, and space. A prominent example is the SNARC (spatial-numerical association of response codes) effect, which describes the fact that human participants are faster and more accurate when responding to small numbers with a left rather than right response, and vice versa. Similar compatibility effects occur when physical size (spatial-size association of response code, SSARC) or valence varies as a stimulus feature, and participants respond with spatially distinct responses. Both the etiology and the structural sources of these compatibility effects are a matter of considerable debate. For many cross-dimensional compatibility effects, both local accounts (e.g., the mental number line as an explanation for the SNARC effect) and global accounts, which attempt to explain several phenomena through a general principle (e.g., a theory of magnitude; polarity correspondence) have been proposed. In this symposium, we present new research on different, cross-dimensional compatibility effects. Two contributions deal with the SNARC effect (Miklashevsky, Lindemann, & Fischer; Wühr & Richter), two talks report on the SSARC effect (e.g., Seegelke & Wühr; Wühr, Richter, & Seegelke), and a fifth contribution is concerned with valence-space interactions (Kühne, Nenaschew, & Miklashevsky). Based on these and other results, we evaluate similarities and differences between different compatibility effects, and discuss the plausibility of global accounts for these effects.
Are spatial-numerical associations of response codes reciprocal or not?
Mon-B21-Talk III-03
Presented by: Melanie Richter
Melanie Richter, Peter Wühr
Department of Psychology, TU Dortmund University
The “spatial-numerical association of response codes“ (SNARC) effect denotes superior performance of left responses to smaller numbers and right responses to larger numbers, as compared to the opposite mapping. This finding provides evidence for associations, or even overlap, between the mental representations of number and space. While some existing accounts predict unidirectional associations between numerical and spatial stimulus and response codes, other accounts predict bidirectional associations between number and space. To investigate the reciprocity of the SNARC effect, we compared the compatibility effect in two manual choice-response tasks. In the number-location task, participants responded to one or two dots with a left or right key press. In the location-number task, participants responded to a left- or right-side stimulus with one or two keypresses. Each task contained one compatible (one-left, two-right; left-one, right-two) and one incompatible (one-right, two-left; left-two, right-one) mapping condition. A strong compatibility effect occurred in the number-location task, reflecting the typical SNARC effect. However, no compatibility effect occurred in the location-number task. The results thus indicate that numerical stimuli can facilitate the selection and execution of spatial responses, whereas spatial stimuli cannot facilitate the selection and execution of numerical responses. The finding that spatial-numerical associations are unidirectional appears consistent with some accounts of the SNARC effect such as the mental-number line hypothesis, but inconsistent with other accounts such as the polarity-correspondence principle.
Keywords: spatial-numerical associations; SNARC; reciprocity; symmetry; mental-number line; polarity correspondence;