Different speakers sometimes convey similar meanings differently. This study examined whether listeners could learn to associate a specific linguistic ‘style’ with a certain speaker, with no apparent difference in meaning, and the role of unnatural linguistic choices (or unexpectedness) in such learning. We created an inter-speaker variation in ‘style’ using the weak adjective ordering preferences in Hebrew. Participants were exposed to two different speakers, each producing a different adjective order, consistently. We manipulated the combinations of order pairings, based on their naturalness (with two natural orders, a natural and an unnatural order, and two unnatural orders), and examined participants’ ability to associate a unique order with a specific speaker. In two experiments, using different statistical analyses, we show that listeners can learn speaker-specific language use when it is irrelevant for meaning inferences, when deviance from natural or expected language use is involved. We further discuss whether learning may be facilitated by differences in naturalness or structural form. Our findings suggest that listeners are sensitive to inter-speaker variability in ‘style’, mostly when this ‘style’ is unexpected. This is in line with the predictions of Surprisal theory, and may suggest that surprisal plays a major role in learning speaker-specific language use.

Inspired by information theoretic analyses of L1 speech and language, this study proposes that L1 and L2 speech exhibit distinct information encoding and transmission profiles in the temporal domain. Both the number and average duration of acoustic syllables (i.e., intensity peaks in the temporal envelope) were automatically measured from L1 and L2 recordings of standard texts in English, French, and Spanish. Across languages, L2 acoustic syllables were greater in number (more acoustic syllables/text) and longer in duration (fewer acoustic syllables/second). While substantial syllable reduction (fewer acoustic than orthographic syllables) was evident in both L1 and L2 speech, L2 speech generally exhibited less syllable reduction, resulting in low information density (more syllables with less information/syllable). Low L2 information density compounded low L2 speech rate yielding very low L2 information transmission rate (i.e., less information/second). Overall, this cross-language comparison establishes low information transmission rate as a language-general, distinguishing feature of L2 speech.

We consider an economy with an incomplete securities market and heterogeneously informed investors. Each investor trades in the market to hedge the risk to his endowment and to speculate on future security payoffs using his private information. We examine the efficiency of the securities market in allocating risk and transmitting information under different market structures, as defined by the set of securities traded in the market. We show that the introduction of derivative securities can decrease the market's efficiency in revealing information on security payoffs, and increase the equity premium and price volatility in the market.