The process for combining concepts into complex meaning is fundamental to
human language and thought. Complex meanings can be formed by grammatical
composition (e.g., “coffee mug”) or by simply associating two words
together in memory (e.g., “coffee, mug”). These two processes, though
conceptually different, have been shown to activate similar brain regions.
For example, compositional phrases such as “red boat” elicit an increased
left anterior temporal lobe (LATL) activity as compared to
non-compositional phrases (e.g., Bemis & Pylkkänen, 2011; Pylkkänen, 2016),
yet this region is also involved in associative encoding tasks such as
face-location associations (e.g., Nieuwenhuis et al., 2012). The current
study is the first to directly compare the two processes in the LATL. We
applied distributional semantic models to disentangle semantic association
from semantic composition and tested whether the LATL is indeed sensitive
to semantic composition or simply tracks the association between words.