The Processing of Two-Digit Numbers Depends on Task Instructions
Abstract
Recently, a lot of research has focused on resolving whether two-digit numbers are processed holistically or compositionally. This has led to inconsistent results. In the present study we investigated effects of task instructions. Subjects performed magnitude or parity judgments on targets preceded by masked primes containing parts of the target at a task-congruent (3#_37) or task-incongruent (#3_37) position. Priming effects were influenced by the instructions: In the magnitude task, the priming effects were primarily mediated by the congruency of the decade digit, whereas in the parity task they were elicited by the congruency of the unit digit, which is in line with a flexible compositional processing style. These and previous findings show that two-digit numbers can be processed in a very flexible way, depending on the task context.
References
(2009). Numerical representation in the parietal lobes: Abstract or not abstract? Behavioural and Brain Sciences, 32, 313–328.
(1990). Is numerical comparison digital? Analogical and symbolic effects in two-digit number comparison. Journal of Experimental Psychology: Human Perception and Performance, 16, 626–641.
(2009). Comparing two-digit numbers: The importance of being presented together. Quarterly Journal of Experimental Psychology, 62, 444–452.
(2011). Digit repetition effect in two-digit number comparison. Zeitschrift für Psychologie / Journal of Psychology, 219, 30–36.
(2009). Internal number magnitude is not holistic either. European Journal of Cognitive Psychology, 21, 672–685.
(2001). Unconscious semantic priming extends to novel unseen stimuli. Cognition, 80, 223–237.
(2001). Decade breaks in the mental number line. Putting the tens and units back in different bins. Cognition, 82, B25–B33.
(1999). Single-digit and two-digit Arabic numerals address the same semantic number line. Cognition, 72, 191–201.
(2004). Cross-notation number priming investigated at different stimulus onset asynchronies in parity and naming tasks. Experimental Psychology, 51, 81–90.
(2002). Automatic stimulus-response associations may be semantically mediated. Psychonomic Bulletin & Review, 9, 107–112.
(2009). Abstract or not? Insights from priming. Behavioral and Brain Sciences, 32, 349–350.
(2008). Dissecting the symbolic distance effect: Priming and comparison distance effects in numerical and non-numerical orders. Psychonomic Bulletin & Review, 15, 419–425.
(2005). Two-digit comparison: Decomposed, holistic or hybrid? Experimental Psychology, 52, 195–200.
(2005). The effect of external representations on numerical tasks. The Quarterly Journal of Experimental Psychology, 58, 817–838.
(2008). Holistic or compositional representation of two-digit numbers? Evidence from the distance, magnitude and SNARC effects in a number-matching task. Cognition, 106, 1525–1536.
