title: An analysis of the transitions between down and up states of the cortical slow oscillation under urethane anaesthesia

authors: Wilson, Marcus T.

subjects: cortex

abstract: We study the dynamics of the transition between the low- and high-firing states of the cortical slow oscillation by using intracellular recordings of the membrane potential from cortical neurons of rats. We investigate the evidence for a bistability in assemblies of cortical neurons playing a major role in the maintenance of this oscillation. We show that the trajectory of a typical transition takes an approximately exponential form, equivalent to the response of a resistor–capacitor circuit to a step-change in input. The time constant for the transition is negatively correlated with the membrane potential of the lowfiring state, and values are broadly equivalent to neural time constants measured elsewhere. Overall, the results do not strongly support the hypothesis of a bistability in cortical neurons; rather, they suggest the cortical manifestation of the oscillation is a result of a step-change in input to the cortical neurons. Since there is evidence from previous work that a phase transition exists, we speculate that the step-change may be a result of a bistability within other brain areas, such as the thalamus, or a bistability among only a small subset of cortical neurons, or as a result of more complicated brain dynamics.

text: An analysis of the transitions between down and up states of the cortical slow oscillation under urethane anaesthesia We study the dynamics of the transition between the low- and high-firing states of the cortical slow oscillation by using intracellular recordings of the membrane potential from cortical neurons of rats. We investigate the evidence for a bistability in assemblies of cortical neurons playing a major role in the maintenance of this oscillation. We show that the trajectory of a typical transition takes an approximately exponential form, equivalent to the response of a resistor–capacitor circuit to a step-change in input. The time constant for the transition is negatively correlated with the membrane potential of the lowfiring state, and values are broadly equivalent to neural time constants measured elsewhere. Overall, the results do not strongly support the hypothesis of a bistability in cortical neurons; rather, they suggest the cortical manifestation of the oscillation is a result of a step-change in input to the cortical neurons. Since there is evidence from previous work that a phase transition exists, we speculate that the step-change may be a result of a bistability within other brain areas, such as the thalamus, or a bistability among only a small subset of cortical neurons, or as a result of more complicated brain dynamics.

year: 2010

title: Holiday Destinations: Understanding the Perceptions of Omani Outbound Tourists

authors: Alsawafi, Abdulaziz Mohammed

subjects: Motivation

abstract: It is becoming increasingly difficult to ignore the growing numbers of Islamic tourists from countries such as the Gulf Cooperation Council (GCC) zone and Indonesia. This thesis aims to understand Omani outbound pleasure travellers by identifying their travel motivations, the main travel and leisure constraints they experience, and how they overcome these constraints. It also investigates the influence of Islamic teachings on their choice of a pleasure destination and their participation in leisure activities. 
The main data collection methods involved in-depth interviews (n = 27) (the qualitative phase), and the distribution of a self-completion questionnaire (n = 298) (a quantitative phase) to both actual travellers and non-travellers. A mixed method approach allowed further insight into the research phenomenon as well as enhancing the trustworthiness of the research findings. Content analysis was used to analyse the qualitative data using CatPac (CATegory PACkage) and Leximancer software, while the quantitative data were analysed by utilising analysis techniques including T-tests, ANOVA, factor analysis, cluster analysis, regression, and MANOVA in SPSS.
The study identifies: (a) the most important push and pull travel motivations for Omani outbound tourists; (b) the main travel and leisure constraints that inhibit Omanis from travelling overseas and participating in leisure activities; and, (c) the most frequent travel and leisure negotiation strategies that are adopted to overcome these constraints. The results of the study also determine the influence of socio-demographic variables (gender, marital status, age, educational level, income, and occupation) on Omani tourists' perceptions and behaviours. In terms of the impact of Islamic teachings, this study finds that the Islamic teachings have an indirect influence on the choice of a pleasure travel destination and a direct influence on participation in leisure activities. In relation to market segmentation, the study finds that it is possible to segment Omani outbound tourists based on their travel motivations. Further, this study suggests that participation, or nonparticipation, in overseas travel is an outcome of the joint action of travel motivations and constraints. Other useful findings relate to the three-dimensional leisure constraints model as well as the influence of travel motivations and constraints on the use of negotiation strategies are reported.
The current study provides information that will aid the travel and leisure industry in targeting the Muslim travel market to formulate effective marketing strategies and develop appropriate product plans. Finally, both the managerial implications of the study’s results, and possible future research directions, are discussed.

text: Holiday Destinations: Understanding the Perceptions of Omani Outbound Tourists It is becoming increasingly difficult to ignore the growing numbers of Islamic tourists from countries such as the Gulf Cooperation Council (GCC) zone and Indonesia. This thesis aims to understand Omani outbound pleasure travellers by identifying their travel motivations, the main travel and leisure constraints they experience, and how they overcome these constraints. It also investigates the influence of Islamic teachings on their choice of a pleasure destination and their participation in leisure activities. 
The main data collection methods involved in-depth interviews (n = 27) (the qualitative phase), and the distribution of a self-completion questionnaire (n = 298) (a quantitative phase) to both actual travellers and non-travellers. A mixed method approach allowed further insight into the research phenomenon as well as enhancing the trustworthiness of the research findings. Content analysis was used to analyse the qualitative data using CatPac (CATegory PACkage) and Leximancer software, while the quantitative data were analysed by utilising analysis techniques including T-tests, ANOVA, factor analysis, cluster analysis, regression, and MANOVA in SPSS.
The study identifies: (a) the most important push and pull travel motivations for Omani outbound tourists; (b) the main travel and leisure constraints that inhibit Omanis from travelling overseas and participating in leisure activities; and, (c) the most frequent travel and leisure negotiation strategies that are adopted to overcome these constraints. The results of the study also determine the influence of socio-demographic variables (gender, marital status, age, educational level, income, and occupation) on Omani tourists' perceptions and behaviours. In terms of the impact of Islamic teachings, this study finds that the Islamic teachings have an indirect influence on the choice of a pleasure travel destination and a direct influence on participation in leisure activities. In relation to market segmentation, the study finds that it is possible to segment Omani outbound tourists based on their travel motivations. Further, this study suggests that participation, or nonparticipation, in overseas travel is an outcome of the joint action of travel motivations and constraints. Other useful findings relate to the three-dimensional leisure constraints model as well as the influence of travel motivations and constraints on the use of negotiation strategies are reported.
The current study provides information that will aid the travel and leisure industry in targeting the Muslim travel market to formulate effective marketing strategies and develop appropriate product plans. Finally, both the managerial implications of the study’s results, and possible future research directions, are discussed.

year: 2013

title: Portfolio of compositions

authors: Hoadley, Benjamin Russell

subjects: New Zealand composition

abstract: The music in this portfolio of original compositions is steeped in the Western tradition of tonal music. The pieces were written while also pursuing a professional career as a bassoonist touring internationally and performing a wide variety of western art music, from Renaissance to contemporary. I have responded to these influences consciously and unconsciously in my music. The overarching focus of this composition portfolio is to provide an answer to the question — to what extent do musical influences impact on the compositions of an international touring performer?

Underpinning the portfolio is the fact that the pieces were all written in New Zealand during periods of intense reflection and study. While I am constantly collecting ideas and inspiration for my music while travelling, I consolidate and realise these ideas only when I am home.

I identify with being a New Zealand composer, with cosmopolitan influences on my music reflecting the global influences on New Zealand’s culture and art. Working closely with composers performing their music has also informed my composition. I mention Gillian Whitehead in particular, whose music I have performed widely.

The two outer pieces in the portfolio, Huia and Manaia 4 are the most directly associated with New Zealand in their subject matter. Other pieces have foreign themes, from my nocturnal impressions of New York in Night Music to the Ancient Greece of Ostrakon to the West African poetry of Four Songs.

All of the pieces were written for professional musicians to perform, including the Auckland Philharmonia Orchestra and the Sydney Omega Ensemble. Having these outstanding performers in mind while writing, and interacting with these musicians during the composition process, has informed my writing.

text: Portfolio of compositions The music in this portfolio of original compositions is steeped in the Western tradition of tonal music. The pieces were written while also pursuing a professional career as a bassoonist touring internationally and performing a wide variety of western art music, from Renaissance to contemporary. I have responded to these influences consciously and unconsciously in my music. The overarching focus of this composition portfolio is to provide an answer to the question — to what extent do musical influences impact on the compositions of an international touring performer?

Underpinning the portfolio is the fact that the pieces were all written in New Zealand during periods of intense reflection and study. While I am constantly collecting ideas and inspiration for my music while travelling, I consolidate and realise these ideas only when I am home.

I identify with being a New Zealand composer, with cosmopolitan influences on my music reflecting the global influences on New Zealand’s culture and art. Working closely with composers performing their music has also informed my composition. I mention Gillian Whitehead in particular, whose music I have performed widely.

The two outer pieces in the portfolio, Huia and Manaia 4 are the most directly associated with New Zealand in their subject matter. Other pieces have foreign themes, from my nocturnal impressions of New York in Night Music to the Ancient Greece of Ostrakon to the West African poetry of Four Songs.

All of the pieces were written for professional musicians to perform, including the Auckland Philharmonia Orchestra and the Sydney Omega Ensemble. Having these outstanding performers in mind while writing, and interacting with these musicians during the composition process, has informed my writing.

year: 2016