Miscommunication between controllers and pilots, potentially resulting from a high pilot cognitive load, has been a causal or contributing factor in a large number of aviation accidents. In this context, failure to communicate can be attributed, among other factors, to an inadequate human-system interface design, the related high cognitive load imposed on the pilot, and poor performance reflected by a higher error rate. To date, voice radio remains in service without any means for managing pilot cognitive load by design (as opposed to training or procedures). Such an oversight is what prompted this dissertation. The goals of this study were (a) to investigate the utility of a voice-to-text transcription (V-T-T) of ATC clearances in managing pilot's cognitive load during controller-pilot communications within the context of a modern flight deck environment, and (b) to validate whether a model of variable relationships which is generated in the domain of learning and instruction would "transfer", and to what extend, to an operational domain. First, within the theoretical framework built for this dissertation, all the pertaining factors were analyzed. Second, by using the process of synthesis, and based on guidelines generated from that theoretical framework, a redundant verbal display of ATC clearances (i.e., a V-T-T) was constructed. Third, the synthesized device was empirically examined. Thirty four pilots participated in the study – seventeen pilots with 100-250 total flight hours and seventeen with > 500 total flight hours. All participants had flown within sixty days prior to attending the study. The experiment was conducted one pilot at a time in 2.5-hour blocks. A 2 Verbal Display Redundancy (no-redundancy and redundancy) X 2 Verbal Input Complexity (low and high) X 2 Level of Expertise (novices and experts) mixed-model design was used for the study with 5 IFR clearances in each Redundancy X Complexity condition. The results showed that the amounts of iii reduction of cognitive load and improvement of performance, when verbal display redundancy was provided, were in the range of about 20%. These results indicated that V-T-T is a device which has a tremendous potential to serve as (a) a pilot memory aid, (b) a way to verify a clearance has been captured correctly without having to make a "Say again" call, and (c) to ultimately improve the margin of safety by reducing the propensity for human error for the majority of pilot populations including those with English as a second language. Fourth, the results from the validation of theoretical models "transfer" showed that although cognitive load remained as a significant predictor of performance, both complexity and redundancy also had unique significant effects on performance. Furthermore, these results indicated that the relationship between these variables was not as "clear-cut" in the operational domain investigated here as the models from the domain of learning and instruction suggested. Until further research is conducted, (a) to investigate how changes in the operational task settings via adding additional coding (e.g., permanent record of clearances which can serve as both a memory aid and a way to verify a clearance is captured correctly) affect performance through mechanisms other than cognitive load; and (b) unless the theoretical models are modified to reflect how changes in the input variables impact the outcome in a variety of ways; a degree of prudence should be exercised when the results from the model "transfer" validation are applied to operational environments similar to the one investigated in this dissertation research.

La survie de nos ancêtres dépendait grandement de leurs relations sociales. Selon une approche évolutionniste, la fonction de la honte est de réduire les risques de perdre en valeur sociale. Cependant, d’autres théories maintiennent que la honte n’est pas fonctionnelle : elle est liée à un mauvais ajustement psychologique (ex., dépression et agressivité). Il est supposé que les deux théories puissent être réconciliées sous un acompte fonctionnel : être honteux peut être avantageux dans certains contextes (quand une transgression est commise), et peut être couteux dans d’autres (en absence de transgression). Les participants (n = 294, Mâge = 42, ÉT = 13.423) sont assignés au hasard à une vignette décrivant soit un acteur commettant une transgression (ex., voler de l’argent ou insulter un collègue) ou aucune transgression, puis ils voient une photo de l’acteur montrant soit de la honte ou aucune émotion. Ensuite ils évaluent l’acteur sur 17 items incluant des traits désirables (amical) et des traits indésirables (égoïste). Suite à une analyse factorielle exploratoire, les items sont regroupés sous deux dimensions (évaluation bénigne et absence de traits indésirables) afin de simplifier les analyses statistiques. L’hypothèse n’est pas soutenue : les acteurs honteux reçoivent des scores plus bas sur l’évaluation bénigne et l’absence de traits indésirables indépendamment de la présence ou absence d’une transgression. Cependant, des analyses supplémentaires suggèrent que les conséquences de montrer de la honte sont plus complexes. Davantage de recherches sont nécessaire afin d’examiner si exprimer de la honte est encore fonctionnel aujourd’hui. / Our ancestors’ survival greatly depended on their social relationships. According to an evolutionary perspective, shame’s function is to reduce the likelihood of losing social value in the eyes of fellow group members; however, certain accounts hold that shame may not be functional: it is related to psychological maladjustment (ex., depression and aggression). It is hypothesized that the two views are not conflicting; they can be reunited under a functional account. In other words, being shameful is beneficial under certain conditions (when a transgression is known to others) and costly under other conditions (when no transgression has been committed). Participants (n = 294, Mage = 42, SD = 13.423) were randomly assigned to read a vignette describing a transgression (stealing money or insulting a colleague) or no transgression, then exposed to a photo of an actor displaying either shame or no emotion, and then they rated the actor on 17 items including desirable traits (ex., friendly) and undesirable traits (ex., selfish). Through an exploratory factorial analysis, items were grouped into two factors (benign evaluations and absence of undesirable traits) in order to simplify statistical analyses. The hypothesis was not supported: shameful actors received lower scores on benign evaluations and absence of undesirable traits regardless of the presence or absence of a transgression. However, further analyses indicate that the consequences of displaying shame are more complex. These results suggest more research is necessary to examine whether the shame display remains functional today.