Speaker
Description
Emerging evidence suggests that decision-making extends into motor response execution. In this study, we assessed the hypothesis that motor decisional components are related to decision confidence. In a visual lexical decision task, participants categorized strings of letters as words or nonwords, and electromyographic (EMG) traces were used to partition reaction times (RTs) into premotor time (PMTs; from stimulus onset to EMG onset) and motor time (MTs; from EMG onset until the button-press). The stimuli varied in word frequency (high vs. low; e.g., house vs. whiff) and nonword type (pseudowords vs. 1-letter-different nonwords; e.g., flirp vs. tadle). After each response, participants rated their confidence on a 100-point scale (0 = sure error; 100 = sure correct). Results revealed that the word frequency effect (faster latencies for high- than for low-frequency words) was bounded to the PMT, with no difference in MT. In contrast, the lexicality effect (slower latencies for nonwords than for words) was evident in both PMT and MT. Notably, differences between low-frequency words and nonwords were observed in MT, but not in terms of decision confidence. Also, variations in confidence were detected between high- and low frequency words, but they were not reflected at the level of MT. Therefore, MT results cannot be entirely attributed to decisional confidence.
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