Perception of surface stickiness in different sensory modalities: an functional MRI study

Surface texture can be perceived not only from tactile, but also from auditory and visual sensory cues. In our previous psychophysical study, we demonstrated that humans can recognize surface stickiness using only one kind of sensory modality without any difficulty. However, the brain regions that would be activated by non-corresponding sensory cues, for example, auditory and visual cues, remain unknown. In this human functional MRI study, we explored brain regions associated with surface stickiness perception in each of three different sensory modalities, and sought for common neural activities across modalities. In the tactile condition, participants actually touched a sticky surface with their right index finger. In the auditory and visual conditions, audio and video clips of tactile explorations of a sticky surface were presented and participants were asked to recall the perceived stickiness as vividly as possible. Our results, based on a general linear model analysis, showed that somatosensory cortices including postcentral gyrus, anterior insula, and anterior intraparietal sulcus were significantly activated across all modalities. Moreover, we observed significant activation of primary sensory regions of each modality. A follow-up conjunction analysis identified that postcentral gyrus, anterior intraparietal sulcus, precentral gyrus, and supplementary motor area were activated in common. These findings could deepen our understanding of the surface stickiness perception in the human brain

Suji Kwock Kim's “Generation” and the Ethics of Diasporic Postmemory

Regarding her highly acclaimed first book of poetry, Notes from the Divided Country, second-generation Korean American poet Suji Kwock Kim has stated that she considers the representation of the traumatic experiences of the Korean War as “the responsibility that one has, in terms of using the imagination as a means of compassion, and understanding things one couldn't have experienced.” If Notes from the Divided Country is a work created from a sense of ethical responsibility, we could perhaps also see it more specifically as a project of ethical memory and ask, along with ethnic studies scholar Jodi Kim, “What does it mean to want to represent or ‘remember’ a war that has been ‘forgotten’ and erased in the U.S. popular imaginary, but has been transgenerationally seared into the memories of Koreans and Korean Americans, and experienced anew every day in a still-divided Korea?” Notes from the Divided Country in many ways grapples with this very question and can be seen as an effort to remember the “Forgotten War” through vivid, chilling, moving poems that depict the enduring trauma of wartime violence from the perspective of diasporic postmemory. Taking Hirsch's work on Holocaust photos as a point of departure, this article reads in the poem “Generation” the poetics of postmemory and the ethics of memory from the perspective of diasporic subjectivity

Redefining Diaspora through a Phenomenology of Postmemory

This article seeks to intervene in the debates about the definition of diaspora by attending to the way in which it is a phenomenon, rooted in a particular kind of experience and consciousness. This approach seeks to move beyond ontological definitions based on categorical criteria toward a more phenomenological definition that can help us better understand the lived experience of diasporic subjects and the formation of diasporic communities. While these groups do not exist as entities that have some common essence or nature, I insist that they do exist phenomonologically. Rather than an objective, prescriptive definition of diaspora, this essay explores the subjective, descriptive quality of diaspora when approached from the inside, as an experience. A phenomenological approach, therefore, can rescue the term diaspora from its overextensions and case-specific limitations. A key consideration will be the role of memory in creating the phenomenon of diaspora. Diaspora must be understood as a phenomenon that emerges when displaced subjects who experience the loss of an "origin" (whether literal or symbolic) perpetuate identifications associated with those places of origin in subsequent generations through the mechanisms of postmemory

Fabrication of three-dimensional suspended, interlayered and hierarchical nanostructures by accuracy-improved electron beam lithography overlay

Nanofabrication techniques are essential for exploring nanoscience and many closely related research fields such as materials, electronics, optics and photonics. Recently, three-dimensional (3D) nanofabrication techniques have been actively investigated through many different ways, however, it is still challenging to make elaborate and complex 3D nanostructures that many researchers want to realize for further interesting physics studies and device applications. Electron beam lithography, one of the two-dimensional (2D) nanofabrication techniques, is also feasible to realize elaborate 3D nanostructures by stacking each 2D nanostructures. However, alignment errors among the individual 2D nanostructures have been difficult to control due to some practical issues. In this work, we introduce a straightforward approach to drastically increase the overlay accuracy of sub-20 nm based on carefully designed alignmarks and calibrators. Three different types of 3D nanostructures whose designs are motivated from metamaterials and plasmonic structures have been demonstrated to verify the feasibility of the method, and the desired result has been achieved. We believe our work can provide a useful approach for building more advanced and complex 3D nanostructures.114sciescopu