This thesis analyses the gender differences in spatial orientation and mental imagery when navigating a virtual environment with only auditory cues. A prototype was developed for an iPod Touch device to evaluate possible gender difference in performance of orientation. A sketch map task was conducted to externalize the participants’ mental representation they achieved from the environment. Questionnaires were used to collect data on previous video game experience, spatial orientation self-assessment and spatial anxiety. A post-interview was conducted to gather qualitative information from the participants on how they experienced the experiment and to collect some background about them. In total, 30 participants (15 females, 15 males) with tertiary education participated in the experiment. The result indicates that there are gender differences in time to complete the tasks in the virtual environment. In the sketch map task, there were no gender differences in how well they sketch and externalize their mental representation of the environment. The post-interview showed tendencies that there are possible gender differences in vividness of mental imagery.

Mental imagery is a common theme in research that clarifies how musical thought relates to musical performance. Unfortunately, minimal information exists regarding mental imagery and singers. The purpose of this study was to probe the role, if any, mental imagery plays in the conceptualization of pitch and vowel. By interviewing singers at differing levels of expertise, basic information was obtained about the mental processes used by singers. Through evaluations of the singers' mental processes, it was concluded that 95% of the singers in the study employed mental imagery. All singers described using kinesthetic imagery, while the majority implemented sensory and auditory imagery. Viso-spatial imagery was implemented among the more experienced singers. The majority of singers also reported: imaging pitch and vowel interactively; imaging from an internal perspective; and utilizing mental rehearsal. Less than half of the singers described using methods other than mental imagery to conceptualize pitch and vowel.

Reading comprehension proficiency is vital for learners to be successful in their academic career, however, South African studies have revealed that reading comprehension skills are severely underdeveloped in secondary school learners. Local research has investigated many contributing factors such as multilingualism and deficits with the national curriculum standards. Far fewer studies have examined the cognitive underpinnings that differentiate between English second language (ESL) learners who are proficient in reading comprehension and those who are not. Certain multi-coding theories assert that the integration of visual mental imagery and verbal information is essential for the formation of a comprehensive mental model, which forms the basis of reading comprehension. This study explored the relationship between visual reasoning ability and the reading comprehension proficiency in a group of 83 ESL learners from two urban Gauteng schools. One school represented learners who are proficient readers whilst the second group represented learners who are developing readers. The Non-Verbal Reasoning and the 3D Spatial Manipulation subtests from the Differential Aptitude Test (DAT) battery were used to explore the learners’ ability to reason using visual-object and visual-spatial mental imagery. The Verbal Reasoning test was used to establish a baseline for the learners’ language skills. The items of the Reading Comprehension subtest of the Stanford Diagnostic Reading Test battery (SDRT-RC) were evaluated for textual factors that contribute toward word concreteness effects. The relationships between the DAT subtests and the SDRT-RC Mixed, Abstract and Concrete Items subtests were discussed in light of multi-coding models of reading comprehension.

Mental images are unique mental representations and the depictive view in the imagery debate states that mental images have similar spatial structures as their corresponding external object. The propositional view, however, contends that beliefs about the external world influence a mental image – also known as the cognitive penetrability theory –, therefore mental images cannot be described in visual terms. People with self-described aphantasia, those considered lacking visual mental images, offer a new opportunity to approach this issue. The current study employed the mental rotation task (MRT), where a three-dimensional object needs to be mentally aligned with another one that is rotated to a different angular position. To test the effects of beliefs on mental images, different instruction conditions were used on the MRT. Twenty-seven participants (21 females, mean age 47 years) with self-described aphantasia completed an online experiment, consisting of the MRT, the Object-Spatial Imagery Questionnaire (OSIQ), and the Vividness of Visual Imagery Questionnaire (VVIQ). While participants scored low on the VVIQ and higher on the spatial items than on the object items of the OSIQ, the key finding was that increasing reaction time with increasing angular disparity on the MRT was not influenced by different instruction types. This suggests that the theory of cognitive penetrability is not applicable on mental rotation in aphantasia, highlighting the importance to revise how mental images (or the lack of them) are understood and described.

Shepard and Metzler (1971) argued that mental rotation is analogous to the real world in that people imagine the rotation of an object as if it were being physically rotated. This study tested this assertion by exposing participants to physical shapes that increased in size and weight. Participants interacted with blocks designed after Shepard and Metzler mental rotation size that differed in size and weight then performed subsequent mental rotation. We found no difference in reaction time but found that increased size reduced accuracy. We discuss the implications of this study as they pertain to embodied cognition.

In a world where gamification is increasingly prevalent, Dungeons & Dragons is a vast, seemingly untapped arena into which students in an EFL classroom could potentially venture. By exploring the various applications of the hugely popular tabletop role-playing game, there are several aspects in which students and teachers can explore in order to find practical as well as theoretical uses for a role-playing game of this size and scope. This study has discussed and analyzed the benefits and drawbacks of implementing Dungeons & Dragons in the EFL classroom through mental imagery and immersion as an effective teaching tool. The implementation of D&D in an EFL classroom is achievable through scaffolding and preparation. This study has also discussed the gamification aspects of the EFL classroom and the game specific areas of game-based pedagogy.

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Humans and other animals systematically discount the value of future rewards as a function of their delay, and individual differences in the steepness of this ``delay discounting'' are predictive of a range of important real-world outcomes. Episodic future thinking, the mental simulation of episodes in the personal future, is one means by which to curb delay discounting. This thesis seeks to contribute to our understanding of how this effect occurs. The account that predominates in the literature is that episodic future thinking simulates the experience of future rewards, enabling their undiscounted value to be appreciated in the present. This thesis takes this account as a starting point, formalizing it in a mathematical model and carrying out several experimental studies to test its predictions. We find that key predictions are not borne out and develop an alternative account in which simulated experience plays a less central role. / Thesis / Doctor of Philosophy (PhD) / Pursuing our goals for the future usually means sacrificing immediate gratification, yet we often make decisions that are not in our best interest over the long term. This is because we assign lower subjective value to future rewards the further they are from the present. Individuals differ in how much they devalue future rewards, and these differences are related to many real-world outcomes. Our tendency to devalue future rewards is reduced when we vividly imagine the future in a process called ``episodic future thinking,'' and this thesis seeks to understand how this effect occurs. The most obvious explanation would seem to be that episodic future thinking ``simulates'' the experience of future rewards and allows us to recognize their value in the present. However, using results from several experimental studies, I argue that this may not be the best explanation after all, and I develop an alternative.

A normative experimental study was undertaken to establish whether engaging in positive, negative, and neutral mental imagery affected the reaction rate of participants to positive, negative, and neutral word stimuli. The sample consisted of computer literate, English speaking participants with no history of clinical disorders. A total of 80 participants took part in the study, with 40 participants from either gender. The results of a factorial ANOVA indicated that the type of mental imagery engaged in had a significant effect on the rate at which participants responded to stimuli (p=.00023, F=8.4057), whilst the emotional valence of the stimuli did not have a significant effect (p=.30503, F=1.1877). However, the interaction between the type of mental imagery and the emotional valence of the stimuli was highly significant (p=.00794, F=3.4576), thereby indicating that engaging in positive or negative mental imagery did bias participants towards a faster reaction rate to positive or negative stimuli respectively. / M.A. (Psychology) / Psychology

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