A considerable amount of research has emerged in recent years concerning second language (L2) learner sensitivity to various information types. From this, Clahsen and Felser proposed the Shallow Structure Hypothesis (SSH) to account for increased learner sensitivity to certain kinds of non-structural (e.g., contextual, discoursal, semantic, and pragmatic) versus more structural (e.g., syntactic, morphological) cues while parsing linguistic input. Some argue, however, that the mechanisms responsible for linguistic processing in both the L1 and L2 are essentially the same and differences between the two populations emerge only quantitatively. Under this perspective, 'nativelike' processing performance for L2 learners is very much a possibility and a growing amount of research demonstrates that purported differences in the processing of even complex grammatical constructions can and do diminish to the point of imperceptibility. Moreover, certain aspects of executive function and cognitive aptitude have been found to account for a notable share of processing discrepancies. This dissertation seeks to extend the purview of the SSH by testing L1-Korean L2-English learners' sensitivity to morphological cues "all" and "any" in scalar implicature computation through a Likert-scale judgement task while also assessing all participants' abilities in context maintenance and attentional control. In the question 'Are all/any of the squares red?', the cue any primes a 'some and possibly all squares are red' interpretation. "All," on the other hand, primes the reading 'some but not all squares are red'. These questions were presented together with pictures depicting a series of zero, three, or five of five same-colored shapes. In the target condition with pictures showing five of five of the same-colored shapes, the 'some squares are red' response is pragmatically infelicitous. Therefore, an "all" QUD should elicit lower ratings in comparison to the "any" QUD condition provided participants fully maintain signals from the cues. Linear mixed-effects regression analysis on "z"-score transformed ratings showed that both L2 learners and native speakers differentiated between the two target conditions. Additionally, both context maintenance and attentional control were found to modulate rating sensitivity to the target scenarios but each ability aided the two groups differently. For native speakers, increased aptitude in context maintenance resulted in larger rating differences among the two target conditions while attentional control was found to be the main factor in rating sensitivity for L2 speakers. Results from this dissertation offer evidence that L2 learners are able to attend to the same types of contextual information as native speakers in scenarios involving scalar implicature computation, contributing further insight into the information types readily available to the L2 processor. These findings reveal, however, that L1 and L2 processing are not identical in nature, with certain cognitive traits playing a more substantive role for each group in awareness of triggers that contribute to pragmatic inferencing. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]