A recent trend in consumer and military electronics has been to allow operators the option to control the system via novel control methods. The most prevalent and available form of these methods is that of vocal control. Vocal control allows for the control of a system by speaking commands rather than manually inputting them. This has not only implications for increased productivity but also optimizing safety, and assisting the disabled population. Past research has examined the potential costs and benefits to this novel control scheme with varying results. The purpose of this study was to further examine the relationship between modality of input, operator workload, and expertise. The results obtained indicated that vocal control may not be ideal in all situations as a method of input as participants experienced significantly higher amounts of workload than those in the manual condition. Additionally, expertise may be more specific than previously thought as participants in the vocal condition performed nearly identical at the task regardless of gaming expertise. The implications of the findings for this study suggest that vocal control be further examined as an effective method of user input, especially with regards to expertise and training effects.

This thesis was motivated by a study of how robots can be taught by humans, with an emphasis on allowing persons without programming skills to teach robots. The focus of this thesis was to investigate what criteria could or should be used by a robot to evaluate whether a human teacher is (or potentially could be) a good teacher in robot learning by demonstration. In effect, choosing the teacher that can maximize the benefit to the robot using learning by imitation/demonstration. The study approached this topic by taking a technology snapshot in time to see if a representative example of research laboratory robot technology is capable of assessing teaching quality. With this snapshot, this study evaluated how humans observe teaching quality to attempt to establish measurement metrics that can be transferred as rules or algorithms that are beneficial from a robot's point of view. To evaluate teaching quality, the study looked at the teacher-student relationship from a human-human interaction perspective. Two factors were considered important in defining a good teacher: engagement and immediacy. The study gathered more literature reviews relating to further detailed elements of engagement and immediacy. The study also tried to link physical effort as a possible metric that could be used to measure the level of engagement of the teachers. An investigatory experiment was conducted to evaluate which modality the participants prefer to employ in teaching a robot if the robot can be taught using voice, gesture demonstration, or physical manipulation. The findings from this experiment suggested that the participants appeared to have no preference in terms of human effort for completing the task. However, there was a significant difference in human enjoyment preferences of input modality and a marginal difference in the robot's perceived ability to imitate. A main experiment was conducted to study the detailed elements that might be used by a robot in identifying a 'good' teacher. The main experiment was conducted in two subexperiments. The first part recorded the teacher's activities and the second part analysed how humans evaluate the perception of engagement when assessing another human teaching a robot. The results from the main experiment suggested that in human teaching of a robot (human-robot interaction), humans (the evaluators) also look for some immediacy cues that happen in human-human interaction for evaluating the engagement.

Vocabulary acquisition plays an important role in second language students’ performance. In the process of learning vocabulary, students are exposed to different sorts of input that might affect the way their working memory processes, retains, and recalls the new information they are exposed to, which can be visual, auditory, haptic, or multimodal (Paivio, 1991). Research has been extensively done on the effects of input modality on working memory in L1 word recall tasks in individuals with normal development and also in individuals with visual disabilities; however, no attention has been given to the effects of input modality on working memory in word recall tasks in blind individuals in the realm of second language learning. The current research sought to investigate the effects of input modality on working memory in L2 word recall tasks with the goal of determining if the lack of access to visual stimuli would have any substantial effects on L2 word retention and recall. It was predicted that participants would do better on those word recall tasks that involved the use of more than one modality simultaneously and that lack of access to visual stimuli would not negatively affect L2 word recall. To address these issues, we devised two word recall experiments: experiment 1 for the blind participant of the study (a 24 year old female graduate student who is an English native speaker), and experiment 2 for the sighted participants. Both experiments comprised a Digit Span Test, 4 word recall tasks in which participants were exposed to four different lists of high frequency Spanish words and their English translations in different modalities (Oral, Written (Braille), Oral+Written (Braille), Haptic/visual+Oral), and an interview. Thirty (16 females, 14 males) American English Native speakers who were sighted with ages ranging from 19 to 37 participated in this study; half of them were blindfolded for the last word recall task (Haptic+Oral). The results for both experiments showed that contrary to our predictions and to what dual coding theories claim, our participants were able to recall more words in those tasks that involved the use of only one modality. In part this may be attributed to 1) the fact that it was the first time these participants were exposed to Spanish vocabulary and so it made it more difficult for their working memories to integrate modalities and 2) an information overload since the stimulus words were presented with their translation. Moreover, the lack of access to visual stimuli did not have a strong effect in those participants who were blindfolded, which may be explained by the fact that the oral and haptic input triggered the use of mental imagery when retaining and recalling the words. Finally, the practical and pedagogical implications of the findings of the present study, as well as recommendations for the future research are discussed.