As neural interfaces continue to progress toward practical applications, there is increased demand for smaller, more efficient and cost effective devices. Event related potentials (ERPs) have recently been demonstrated to be reliable for practical communication in disabled individuals using the P300 Speller paradigm. With the objective of simplifying the processing of ERPs in order to minimize the hardware/computational requirements, and therefore the power consumption (for increased battery life for wireless, etc.), this study examines the effects of the analog-to-digital converter amplitude quantization on the ERP classification accuracy for the P300 Speller.

The present study investigated how engaging in a behavior that is potentially incompatible with covert verbal behavior, singing aloud, affected the percent of correct responses and reaction time during equivalence tests as compared to engaging in a behavior considered compatible with covert verbal behavior, alternating foot tapping, during testing. Results varied between participants with some participants showing higher accuracies in the incompatible condition and some in the compatible condition. Performance in terms of accuracy and reaction time were correlated, with higher accuracies in the compatible condition being correlated with faster reaction times in the compatible condition. Limitations discussed include a low number of participants due to COVID-19, the covert nature of the behavior of interest, the length of time required to complete the experiment, and the challenges to monitoring the incompatible behavior due to social distancing requirements. Potential future research is discussed in light of these limitations.

Memory-trace theories of remembering suggest that performance in delayed matching-to-sample (DMTS) procedures depends on a memory trace that degrades with time. By contrast, the theory of direct remembering suggests that increasing the delay between sample and comparison stimuli in DMTS procedures is functionally equivalent to decreasing the disparity between sample stimuli. The present dissertation tested this assumption by assessing the degree to which changes in the frequency of reinforcement for correct choices biased the distribution of choice responses in a conditional-discrimination procedure. Seven pigeons responded under a temporal-discrimination procedure in which temporal sample-stimuli were categorized as being of either short or long duration by a response to a corresponding comparison key. In the sample-stimulus disparity condition, the disparity between the sample stimuli (difference between the short and long samples) was manipulated. In the retention-interval condition, the delay between sample offset and presentation of the comparison stimuli was manipulated. Importantly, the same general procedure was used across conditions, facilitating conclusions regarding functional equivalence of the two manipulations. The theory of direct remembering suggests that the relation between sensitivity of behavior to changes in reinforcer frequency and discriminability (accuracy) should be similar in the sample-stimulus disparity and retention-interval condition. The results showed that discriminability decreased with both the sample-stimulus disparity and retention-interval manipulations. Overall estimates of sensitivity were similar to those obtained previously. There was, however, no difference in the estimates of sensitivity as a function of discriminability during either the sample-stimulus disparity or retention-interval conditions; sensitivity was independent of discriminability. These results are in contrast to most previous reports, and are interpreted in terms of the use of temporal-sample stimuli in the current experiment. Further analyses of the choice-response data showed that the effects of variation in reinforcer ratios differed across conditions as a function of trial type and trial difficulty. These results suggest the need for careful consideration of behavioral outcomes at several levels of analysis when assessing functional equivalence of experimental manipulations. The potential benefits and hindrances of characterization of behavioral outcomes in terms of functional equivalence are discussed.

This dissertation explored sane effects of context on the development of stimulus classes and the transfer of stimulus functions to novel stimuli. The research was also intended to demonstrate the utility of current behavioral theories for prediction and control of contextual effects on class formation. In Experiment lA, contextual control of stimulus classes was established successfully in all six college-student subjects. Matching-to-sample training successfully transferred the function of the contextual stimuli to four novel stimuli, whim resulted in the formation of two three-member classes of contextual stimuli. The first portion of Experiment 1B replicated Experiment 1A with three additional subjects. In the second portion, matching-to-sample training resulted in the establishment of two six-member contextual classes. In Experiment 2, three of four subjects learned a matching-to-sample task in whim the role of the contextual stimuli was controlled by a pair of ''higher-order'' contextual stimuli. 'Iwo of the subjects received matching-to-sample training in whim the function of the higher-order contextual stimuli was transferred to four novel stimuli, which resulted in the development of two three-member, higher-order contextual classes. Experiments 3A, 3B, and 3C demonstrated that sane groupings of stimuli are more difficult to learn than other groupings. The experiments found that overlapping roles of stimuli tended to confuse subjects and that subjects, when confused, would respond based on "familiarity" to stimuli rather than on the conditional relations. Experiments 4A and 4B demonstrated that types of matching performance (identity, oddity, and arbitrary) can be controlled by the presence of contextual stimuli. The experiments also provided evidence supporting the idea that generalized identity (reflexivity) and generalized oddity performances are closely related to, if not prerequisites for, successful arbitrary matching and the development of stimulus classes.

The purpose of this study was to determine how Individuals with Disabilities Education Act (IDEA) Part B funds in the American Recovery and Reinvestment Act (ARRA) were initially budgeted for sustainable or unsustainable purposes by the 50 Local Education Agencies (LEAs) in East Tennessee in 2009-2010. Federal guidance for use of ARRA funds suggested funds should be spent quickly to create or save jobs and support education reforms. Thoughtful investment in order to avoid the funding cliff when ARRA funds ended was also stressed. The one-time funds presented a substantial increase in federal dollars and provided opportunity for LEAs to reduce maintenance of effort, the level of state and local funds an LEA must maintain in order to receive federal funds. The study was conducted to determine if significant relationships existed among the percentage of economically disadvantaged students, the percentage of dollars taken in reduction of maintenance of effort, geographic demographics of the LEAs, and the percentage of dollars budgeted for sustainable purposes. Data sources included the 2009-2010 IDEA Part B ARRA budget applications and 2009-2010 IDEA Special Education Services LEA Budget Applications as approved by the Tennessee Department of Education. The LEA Report Card Profiles were the source for the percentage of economically disadvantaged population. Significant results were found in the difference in dollars budgeted for unsustainable and sustainable purposes with more funds for unsustainable efforts. No significant relationships were found among the percentage of dollars budgeted for sustainable purposes, the percentage of reduction in maintenance of effort, the percentage of economically disadvantaged students, and the rural-urban index classifications of the LEAs. The study indicates the importance of careful long-term planning by LEAs to identify and prioritize needs in order to appropriately budget short-term funds to the best advantage for students. There may also be implications for state and federal entities that underscore the importance of specific structuring and clear communication of parameters for use of short-term funds.

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