Recent research has suggested that number processing is embodied, that is, it involves the motor system. To test this assumption, we will employ a novel method of grip force measurement. Our predictions are based on two theoretical models: A Theory of Magnitude (ATOM) and the confidence model. ATOM postulates that magnitudes in various domains develop together and are linked to each other. According to this theory, larger magnitudes in one domain should correlate with larger magnitudes in the other domain. Therefore, larger numbers would evoke stronger force responses. In its turn, the confidence model predicts that the amount of evidence in favour of the given response correlates with the response magnitude. Here, high frequency numbers (small and round numbers) will evoke stronger force responses. In our experiment we will record continuous grip force production in high temporal and force resolution (ms/mN) across two tasks employing the Go/NoGo paradigm. In the first task (n-back-1) a stream of white (No-Go trials) and red (Go-trials, 16.7 %) single digit numbers will be presented. Participants will have to verbally respond whether a red number is different by 1 or 2 compared to the previous number. In the second task (Single Digit Number), we will present correct (No-Go trials) and incorrect (Go-trials, 25.7 %) addition/subtraction problems by their sequential elements (e. g. 1 +1 = 2 vs. 1 + 1 = 3). Participants will have to verbally respond when they see an incorrect answer. In this task, we will be able to measure force profiles of numbers in their relation to their position relative to the operand. Our findings will inform the theory of embodied cognition in general and, in particular, add to our understanding of number processing.
|Title of host publication
|The Connection of Force and Number Magnitude is Measured in the Hand
|Published - 02.2022