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Using the speeded word fragment completion task to examine semantic priming

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Abstract

The present research investigates semantic priming with an adapted version of the word fragment completion task. In this task, which we refer to as the speeded word fragment completion task, participants need to complete words such as lett_ce (lettuce), from which one letter was omitted, as quickly as possible. This paradigm has some interesting qualities in comparison with the traditionally used lexical decision task. That is, it requires no pseudowords, it is more engaging for participants, and most importantly, it allows for a more fine-grained investigation of semantic activation. In two studies, we found that words were completed faster when the preceding trial comprised a semantically related fragment such as tom_to (tomato) than when it comprised an unrelated fragment such as guit_r (guitar). A third experiment involved a lexical decision task, to compare both paradigms. The results showed that the magnitude of the priming effect was similar, but item-level priming effects were inconsistent over tasks. Crucially, the speeded word fragment completion task obtained strong priming effects for highly frequent, central words, such as work, money, and warm, whereas the lexical decision task did not. In a final experiment featuring only short, highly frequent words, the lexical decision task failed to find a priming effect, whereas the fragment completion task did obtain a robust effect. Taken together, these results suggest that the speeded word fragment completion task may prove a viable alternative for examining semantic priming.

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Notes

  1. Contextual diversity is the log-transformed number of contexts in which a certain word occurs. This variable has been shown to be more informative than word frequency (Adelman et al., 2006; Brysbaert & New, 2009).

  2. Originally, the model also allowed the random intercepts and random slopes to be correlated. However, we obtained high correlations (i.e., 1.00), which indicate that the model is overparameterized (Baayen, Davidson, & Bates, 2008). We thus simplified the model by removing the correlation parameters, as suggested by Baayen and colleagues. Random effects for the control predictors were not included in the model because it would increase the number of parameters without being considered essential (Barr et al., 2013).

  3. Note that there were five different types of prime–target relations (i.e., coordinates, supraordinates, property relations, script relations, and synonyms). When repeating the analyses for every type separately, there was never evidence for a Relatedness × Experiment Version interaction (all ps > .15). However, we should point out that the number of items per type may have been too limited to discern differences between tasks in this respect.

  4. Because one cannot rely on frequentist statistics to quantify support for the null hypothesis, a default Bayesian hypothesis test for correlations was performed (Wetzels & Wagenmakers, 2012). The analysis yielded a Bayes factor of 0.096, which is, according to Jeffreys’ classification (1961), strong evidence for the null hypothesis (i.e., the correlation is zero).

  5. Even if we apply Spearman’s correction for attenuation formula (1904) to take measurement error into account, the correlation maximally increases to .36.

  6. The latter is not surprising, given the finding that priming in the lexical decision task decreases when word frequency increases (Becker, 1979).

  7. Both correlations increased to, respectively, .21 and –.22, and became marginally significant if Forward Association Strength was calculated considering only primary associates.

  8. There were 304 trials in Experiment 1 and 288 in Experiment 2, resulting in, respectively, 303 and 287 pairs because of its continuous nature. Thus, the relatedness proportion is only .125 (i.e., 38/303 and 36/287). Note that this number may be a little higher for some participants because of the random ordering of pairs (e.g., showerchocolate followed by cakevault).

  9. Note that the BA targets in the Thomas et al. study (2012) were significantly less frequent than the FA targets, with the SYM targets falling somewhere in between. Given that Scaltritti et al. (2013) found a significant Priming × Frequency × Stimulus quality (i.e., target degraded or not) interaction, it is unclear whether the pattern of results in Thomas et al. is (partly) a frequency effect in disguise. Indeed, Scaltritti and colleagues found a stronger Priming × Stimulus quality interaction for less-frequent target words.

  10. Note that the continuous lexical decision task has been argued to prevent semantic matching as well (McNamara & Altarriba, 1988). Nevertheless, the presence of a semantic relation in this task still predicts word 100 % of the time. Hence, the speeded word fragment completion task is more stringent.

  11. Throughout the three experiments with the speeded word fragment completion task, we always used vowels as the omitted letter (i.e., a, e, i, o, and u in Experiment 1; a and e in Experiments 2 and 4). The rationale was to use letters that are frequently used in everyday language while at the same time keeping the instructions straightforward and easy to remember. The latter is probably only an issue in the variant with five response options. That is, if we had picked five highly frequent consonants, it would arguably be more demanding to remember the response options. However, there is no a priori reason why the obtained results would not generalize to a paradigm that uses consonants; but that is something to examine in future research.

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Author note

T. H. is a research assistant of the Research Foundation–Flanders (FWO–Vlaanderen). This research was partly sponsored by Grant G.0436.13 of the Research Foundation–Flanders (FWO–Vlaanderen), awarded to G. S.

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Correspondence to Tom Heyman.

Appendixes

Appendixes

Appendix A

Table 3 Prime–target pairs from Experiment 1. The first and second columns give the English translations; the third and fourth columns show the Dutch word fragments, with the correct completions in parentheses

Appendix B

Table 4 Prime–target pairs from Experiments 2 and 3. The first and second columns give the English translations; the third and fourth columns show the Dutch word fragments, with the correct completions in parentheses

Appendix C

Table 5 Prime–target pairs from Experiment 4. The first and second columns give the English translations; the third and fourth columns show the Dutch word fragments, with the correct completions in parentheses

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Heyman, T., De Deyne, S., Hutchison, K.A. et al. Using the speeded word fragment completion task to examine semantic priming. Behav Res 47, 580–606 (2015). https://doi.org/10.3758/s13428-014-0496-5

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