Understanding the impact of sociosexual interactions on sleep using Drosophila melanogaster as a model organism

Sleep is conserved across species, and it is believed that a fixed amount of sleep is needed for normal neurobiological functions. Sleep rebound follows sleep deprivation; however, continuous sleep deprivation for longer durations is believed to be detrimental to the animal's wellbeing. Under some physiologically demanding situations, such as migration in birds, the birth of new offspring in cetaceans, and sexual interactions in pectoral sandpipers, animals are known to forgo sleep. The mechanisms by which animals forgo sleep without having any obvious negative impact on the proper functioning of their neurobiological processes are yet unknown. Therefore, a simple assay is needed to study how animals forgo sleep. The assay should be ecologically relevant so it can offer insights into the physiology of the organisms. Equally important is that the organism should be genetically amenable, which helps in understanding the cellular and molecular processes that govern such behaviors. This paper presents a simple method of sociosexual interaction to understand the process by which animals forgo sleep. In the case of Drosophila melanogaster, when males and females are in proximity, they are highly active and lose a significant amount of sleep. In addition, there is no sleep rebound afterward, and instead, males engaged in sexual interactions continue to show normal sleep. Thus, sexual drive in the fruit flies is a robust assay to understand the underlying mechanism by which animals forgo sleep.

The Long-Term and Late Effects of the Diagnosis and Treatment of Colorectal Cancer

Background

Colorectal cancer is the 3rd most common cancer in the UK. Through early detection and improved treatments more people than ever are surviving this disease. Surgery, chemotherapy and radiotherapy are the cornerstones of management, but these invasive treatments can cause a number of long-term and late effects. Using qualitative methods this study aimed to; explore peoples experiences with long-term and late effects of colorectal cancer, how these effects impacted on their lives and how participants managed them.

Method

Semi-structured qualitative interviews were conducted with 15 participants who had completed curative treatment. Interviews were transcribed and analysed using the Framework approach to identify themes and categorise text data.

Results

Many long-term and late effects of colorectal cancer were explored including bowel dysfunction, sexual dysfunction, pain, metastatic disease and cognitive dysfunction. These effects caused distress for many and were linked to depression and social limitation. Previously unidentified long-term effects included decreased libido and joint pain which respondents attributed to chemotherapy. Anxiety and depression were found predominantly to be late effects. Management of long-term and late effects was varied with healthcare services often ineffective.

Conclusion

Insight gained into long-term and late effects and their treatment, indicated that many participants suffered because of their after-effects and had unmet health needs. It adds a qualitative insight into an area where quantitative research has already been conducted. Improvements in cancer follow-up could offer opportunities to effectively identify, manage and monitor these effects. Further interventional studies are required to develop effective care pathways to achieve optimal care.

The Effects of Speed-Modulated Visual Stimuli Seen through Smart Glasses on Work Efficiency after Viewing

It is known that subjective time and work efficiency are affected by visual stimuli. However, existing studies only consider the effects of visual information on the user during viewing and ignore the after effects. Using smart glasses lets users see visual information while moving until just before arriving at the office or school. We hypothesize that the user’s effects from the visual information they were looking at just before working or studying affects the subsequent work. Through two user studies, we investigated whether information presented on smart glasses affected subsequent work efficiency. In the first experiment, participants were presented with avatars running at two levels of speed, or no avatars, through simulated smart glasses in a virtual environment. They then solved a dot-clicking task on a desktop monitor. In the second experiment, we investigated whether the same effect could be shown while walking in the real environment, with a running and a fast-walking avatar both at the same speed in order to see the difference in the effects of the different movements. In the first experiment, we confirmed that the speed of later work tended to improve when presenting the running human-shaped avatar. From the results of the second experiment, which was conducted in the real environment, we did not confirm that the subsequent work speed varied depending on the type of avatar being displayed. As a reason for the trend of improvement in the task efficiency in the first experiment, observation of fast human motion may have unconsciously accelerated the observers’ body movement speed due to the mirror neuron mechanism. As a reason for why the work speed did not improve in the second experiment, the participants may be affected by other pedestrians and running cars. Additionally, it was difficult to see the images on the smart glasses while walking in the real environment.