Abstract
Current research in cerebellar cognitive and linguistic functions makes plausible the idea that the cerebellum is involved in processing temporally contiguous linguistic input. In order to assess this hypothesis, a lexical decision task was constructed to study the effects of cerebellar transcranial magnetic stimulation on semantic noun-to-verb priming based on association (e.g. ‘soap–cleaning’) or similarity (e.g. ‘robbery–stealing’). The results demonstrated a selective increase in associative priming size after stimulation of a lateral cerebellar site. The findings are discussed in the contexts of a cerebellar role in linguistic expectancy generation and the corticocerebellar ‘prefrontal’ reciprocal loop.
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Notes
A simple node-counting scheme (path). The relatedness score is inversely proportional to the number of nodes along the shortest path between the synsets. The shortest possible path occurs when the two synsets are the same, in which case the length is 1. Thus, the maximum relatedness value is 1.
As the software cannot assess the semantic relatedness of words of different grammatical categories (here, nouns and verbs), it was ensured that, in each pair, the noun was homonymous with a verb of the same basic semantic properties, e.g. ‘release’, ‘fear’.
Of course, semantic associative relatedness implies that the forms may co-occur, be it in a non-immediate fashion. However, such loose co-occurrences could easily be found in the categorically related pairs as well. For example, in (1) below, the semantic associatively related pair ‘stripper-entertaining’ (a) can loosely co-occur in speech, like the semantic categorically related one ‘murder-killing’ (b).
(a)‘[…] being a male stripper isn’t just about taking clothes off, it’s about entertaining people […]’
(b)‘It would seem that one is guilty of murder through killing someone by chance […]’ (Google search)
Indeed, the priming sizes of the three participants that had participated in earlier versions of this task were significantly larger overall than those of the rest of the no TMS subjects (Relatedness × Experience with task: F (1, 43) = 5.09, MSe = 342.85, p < 0.03; a large priming effect for the Experienced group: Relatedness: F (1, 1) = 19,063.58, MSe = 0.20, p < 0.005).
Distribution of subjects across lists: list A: n = 12; list B: n = 13; list C: n = 11; list D: n = 10; lateral group: A 3; B 3; C 3; D 3; medial group: A 3; B 4; C 2; D 2; no TMS group 1: A 3; B 3; C 3; D 3; no TMS group 2: A 3; B 3; C 3; D 2.
Abbreviations
- ANOVA:
-
Analysis of variance
- cm:
-
Centimetre
- mm:
-
Millimetre
- ms:
-
Millisecond(s)
- (r)TMS:
-
(Repetitive) transcranial magnetic stimulation
- SD:
-
Standard deviation
- SEM:
-
Standard error of the mean
- BNC:
-
British National Corpus
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Acknowledgments
The authors would like to thank Dr. Thomas Bak, Prof. Simon Garrod, Prof. Jim Hurford, Prof. Vassilios Kimiskidis, Prof. Maria Leggio, Prof. Ken McRae, Prof. Massimo Oliveri, Prof. Martin Pickering, Prof. Richard Shillcock, Prof. Steve Small, Prof Ana Solodkin, Dr. Patrick Sturt, as well as the reviewers of the journal for their precious support and encouragement. NGM was supported by the UK Medical Research Council and by the National Science Council, Taiwan (100-2410-H-008-074-MY3).
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Argyropoulos, G.P., Muggleton, N.G. Effects of Cerebellar Stimulation on Processing Semantic Associations. Cerebellum 12, 83–96 (2013). https://doi.org/10.1007/s12311-012-0398-y
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DOI: https://doi.org/10.1007/s12311-012-0398-y