Rhythms Of Vision

Blair suggests that our belief systems are on the threshold of change, as we create new myths that encompass both the emotional and rational sides of human nature.

5. 1. 1 Biological Rhythms and Clocks From an evolutionary perspective, the adaptation of an organism’s behavior to its environment has depended on one of life’s fundamental traits: biological rhythm generation. In virtually all light-sensitive organisms from cyanobacteria to humans, biological clocks adapt cyclic physiology to geophysical time with time-keeping properties in the circadian (24 h), ultradian (24 h) domains (Edmunds, 1988; Lloyd, 1998; Lloyd et al. , 2001; Lloyd and Murray, 2006; Lloyd, 2007; Pittendrigh, 1993; Sweeney and Hastings, 1960) By definition, all rhythms exhibit regular periodicities since they constitute a mechanism of timing. Timing exerted by oscillatory mechanisms are found throughout the biological world and their periods span a wide range from milliseconds, as in the action potential of n- rons and the myocytes, to the slow evolutionary changes that require thousands of generations. In this context, to understand the synchronization of a population of coupled oscillators is an important problem for the dynamics of physiology in living systems (Aon et al. , 2007a, b; Kuramoto, 1984; Strogatz, 2003; Winfree, 1967). Circadian rhythms, the most intensively studied, are devoted to measuring daily 24 h cycles. A variety of physiological processes in a wide range of eukaryotic organisms display circadian rhythmicity which is characterized by the following major properties (Anderson et al. , 1985; Edmunds, 1988): (i) stable, autonomous (self-sustaining) oscillations having a free-running period under constant envir- mental conditions of ca.

Daily rhythms are a ubiquitous feature of living systems. Generally, these rhythms are not just passive consequences of cyclic fluctuations in the environment, but instead originate within the organism. In mammals, including humans, the master pacemaker controlling 24-hour rhythms is localized in the suprachiasmatic nuclei of the hypothalamus (SCN). This circadian clock is responsible for the temporal organization of a wide variety of functions, ranging from sleep and food intake, to physiological measures such as body temperature, heart rate and hormone release. Moreover, accumulating evidence suggests that dysfunction of the circadian rhythms due to genetic mutations or environmental factors (i.e., jet-lag or shift work) contribute to the development of many pathologies, including sleep disorders, mood and affective disorders such as major depression, bipolar disorder and schizophrenia, as well as the risk of metabolic and cardiovascular disorders.

Based on the award-winning PBS documentary series, Ring of Fire is this first-person account of the adventures of two English brothers as they explore the astonishingly rich cultures of the Indonesian archipelago. Their fascinating odyssey began in 1972 with a 2,500-mile voyage through the fabled Spice Islands, in search of the Greater Bird of Paradise. A decade of further exploration followed, during which the brothers lived among the Asmat cannibals of Papua and the healers of Bali, came face-to-face with the man-eating dragons of Komodo, and encountered the elusive dream wanderers of Borneo. Amid impenetrable rain forests, erupting volcanoes and startling natural beauty, the brothers have captured on film and in words the story of one of the most captivating and intriguing explorations ever made.

Over the last forty years, the number of American households with a stay-at-home parent has dwindled as women have increasingly joined the paid workforce and more women raise children alone. Many policy makers feared these changes would come at the expense of time mothers spend with their children. In Changing Rhythms of American Family Life, sociologists Suzanne M. Bianchi, John P. Robinson, and Melissa Milkie analyze the way families spend their time and uncover surprising new findings about how Americans are balancing the demands of work and family. Using time diary data from surveys of American parents over the last four decades, Changing Rhythms of American Family Life finds that—despite increased workloads outside of the home—mothers today spend at least as much time interacting with their children as mothers did decades ago—and perhaps even more. Unexpectedly, the authors find mothers' time at work has not resulted in an overall decline in sleep or leisure time. Rather, mothers have made time for both work and family by sacrificing time spent doing housework and by increased "multitasking." Changing Rhythms of American Family Life finds that the total workload (in and out of the home) for employed parents is high for both sexes, with employed mothers averaging five hours more per week than employed fathers and almost nineteen hours more per week than homemaker mothers. Comparing average workloads of fathers with all mothers—both those in the paid workforce and homemakers—the authors find that there is gender equality in total workloads, as there has been since 1965. Overall, it appears that Americans have adapted to changing circumstances to ensure that they preserve their family time and provide adequately for their children. Changing Rhythms of American Family Life explodes many of the popular misconceptions about how Americans balance work and family. Though the iconic image of the American mother has changed from a docile homemaker to a frenzied, sleepless working mom, this important new volume demonstrates that the time mothers spend with their families has remained steady throughout the decades.