When I was five, a pond and thicket area down the street from my house was filled in and leveled while I was away. I remember coming home and finding my beloved ecosystem denuded of all greenery, and completely empty of the beavers and their dam, the minnows, the birds, and the countless rabbits and squirrels that had been a comforting and valued presence. I was devastated. Consumed and overcome by grief and loss. I did not want to eat, or (...) play, or go to school. I felt as though I had lost something deeply important, and intimately a part of the fabric of my life. It was the first time in my short life that I became aware of the fragility of life—mine and others—and from that moment, I found myself in a different .. (shrink)

Transcranial magnetic stimulation studies have demonstrated increased cortical facilitation and reduced inhibition following aerobic exercise, even when examining motor regions separate to the exercised muscle group. These changes in brain physiology following exercise may create favorable conditions for adaptive plasticity and motor learning. One candidate mechanism behind these benefits is the increase in brain-derived neurotropic factor observed following exercise, which can be quantified from a venous blood draw. The aim of this study was to investigate changes in motor cortex excitability (...) and inhibition of the upper limb, and circulating BDNF, following high-intensity interval training on a stationary bicycle. Nineteen sedentary adults participated in a randomized crossover design study involving a single bout of high-intensity interval cycling for 20 min or seated rest. Venous blood samples were collected, and transcranial magnetic stimulation was used to stimulate the extensor carpi radialis, where motor evoked potentials were recorded pre- and post-condition. Following exercise, there was a significant increase in corticospinal excitability measured at 120% of resting motor threshold and a reduction in short-interval cortical inhibition. There was a non-significant 23.6% increase in BDNF levels. Collectively, these results reflect a net reduction in gamma aminobutyric acid ergic synaptic transmission and increased glutamatergic facilitation, resulting in increased corticospinal excitability. This study supports the notion that acute high-intensity exercise provides a potent stimulus for inducing cortical neuroplasticity, which may support enhanced motor learning. (shrink)

If C.S. Lewis' A Grief Observed can be considered an account of a lost human relationship, then Cunsolo and Landman's Mourning Nature forms a posthuman, but nonetheless personal, examination of the losses of relationships with plants, animals, and even entire ecosystems—an ecological grief observed. In this regard, one of the motivations for this book was Cunsolo's interviews with Inuit residents who experienced profound sadness and despair at the changes in the landscape brought by climate change. Beyond this, each of the (...) contributors to Mourning Nature brought a variety of written, auditory, visual, and meaning-making experiences to their acts of mourning wild nature. The parallels to Lewis' book end here... (shrink)