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Strengthening literal meanings of linguistic expressions appears central to communicative success. Weakening on the other hand would appear not to be viable given that literal meaning already grossly underdetermines reality, let alone possibility. We discuss productive weakening in fake-type adjectival modification and present evidence from event-related brain potentials that such weakening has neurophysiological consequences and is qualitatively different from other mechanisms of modification. Specifically, the processing of fake-type constructions (e.g., "a fake diamond") evokes a Late Positivity as characteristic of certain types of referential shift or reconceptualization. We argue that fake-type composition involves an intermediate representation that is semantically contradictory and that the Late Positivity reflects an interface repair mechanism that redresses the contradiction. In contrast, composition involving reputedly over-informative real-type adjectives evokes no comparable processing costs.
Hierarchical predictive coding has been identified as a possible unifying principle of brain function, and recent work in cognitive neuroscience has examined how it may be affected by age–related changes. Using language comprehension as a test case, the present study aimed to dissociate age-related changes in prediction generation versus internal model adaptation following a prediction error. Event-related brain potentials (ERPs) were measured in a group of older adults (60–81 years; n = 40) as they read sentences of the form “The opposite of black is white/yellow/nice.” Replicating previous work in young adults, results showed a target-related P300 for the expected antonym (“white”; an effect assumed to reflect a prediction match), and a graded N400 effect for the two incongruous conditions (i.e. a larger N400 amplitude for the incongruous continuation not related to the expected antonym, “nice,” versus the incongruous associated condition, “yellow”). These effects were followed by a late positivity, again with a larger amplitude in the incongruous non-associated versus incongruous associated condition. Analyses using linear mixed-effects models showed that the target-related P300 effect and the N400 effect for the incongruous non-associated condition were both modulated by age, thus suggesting that age-related changes affect both prediction generation and model adaptation. However, effects of age were outweighed by the interindividual variability of ERP responses, as reflected in the high proportion of variance captured by the inclusion of by-condition random slopes for participants and items. We thus argue that – at both a neurophysiological and a functional level – the notion of general differences between language processing in young and older adults may only be of limited use, and that future research should seek to better understand the causes of interindividual variability in the ERP responses of older adults and its relation to cognitive performance.