This study explores the extent to which comprehending negated antonyms in Persian involves the mitigation effect, whereby a negated word means less than its antonym. In two mouse-tracking experiments, participants rated sentences containing negated/non-negated scalar (e.g., tall-short) and complementary (e.g., dead-alive) antonymous adjectives on a continuous scale. Their reaction times and mouse movements were recorded by MouseTracker. The analysis of reaction times shows that negated adjectives are processed slower than their affirmative counterparts. Moreover, the analysis of mouse trajectories shows that (...) complementary adjectives are rated further apart, closer to the endpoints of the scale than scalar adjectives. We also found that both complementary and scalar adjectives are mitigated under negation, but the mitigation effect is greater in scalar, rather than complementary, adjectives. The results speak in favor of a particular kind of mitigation effect, so-called negative strengthening, which causes negated antonyms to receive a strong pragmatic interpretation towards the opposite member of the pair. (shrink)

The ability to sequence thoughts and actions is impaired in Parkinson’s disease. In PD, a distinct error pattern has been found in the offline performance of sequential working memory. This study examined how PD’s performance of sequential working memory unfolds over time using mouse tracking techniques. Non-demented patients with mild PD and healthy controls completed a computerized digit ordering task with a computer mouse. We measured response dynamics in terms of the initiation time, ordering time, movement time, and area under (...) the movement trajectory curve. This approach allowed us to distinguish between the cognitive processes related to sequence processing before the actual movement and the execution processes of the actual movement. PD patients showed longer initiation times, longer movement times, and more constrained movement trajectories than healthy controls. The initiation time and ordering time negatively correlated with the daily exposure to levodopa and D2/3 receptor agonists, respectively. The movement time positively correlated with the severity of motor symptoms. We demonstrated an altered temporal profile of sequential working memory in PD. Stimulating D1 and D2/3 receptors might speed up the maintenance and manipulation of sequences, respectively. (shrink)

A direct scalar implicature (DSI) arises when a sentence with a weaker term like sometimes implies the negation of the stronger alternative always (e.g., John sometimes (∼ not always) drinks coffee). A reverse implicature, often referred to as indirect scalar implicature (ISI), arises when the stronger term is under negation and implicates the weaker alternative (e.g., John doesn’t always (∼ sometimes) drink coffee). Recent research suggests that English-speaking adults and children behave differently in interpreting these two types of SI ( (...) Cremers and Chemla, 2014 ; Bill et al., 2016 ). However, little attention has been paid to how these two types of SI are processed in a non-native, or second language (L2). By using a covered box paradigm, this study examines how these two types of SI are computed and suspended in a second language by measuring the visible vs. covered picture selection percentage as well as response times (RTs) taken for the selection. Data collected from 26 native speakers of English to 24 L1-Chinese L2-English learners showed that unlike native speakers, L2 speakers showed asymmetries in their generation and suspension of DSI and ISI. That is, L2 speakers computed DSI more often than ISI, but they suspended ISI more frequently than DSI. Furthermore, our RT data suggested that L2 speakers suspended ISI not only more frequently but also significantly faster than DSI. Regarding the asymmetrical behavior among L2 speakers, we consider the number of alternative meanings involved in DSI vs. ISI suspension and different routes to the suspension of SI. (shrink)