Throughout the second half of the 20th Century,our nation’s cities were marred by the onslaught of unsustainable suburbanization and the expansion of limited access highways that ripped through urban centers and divi...Throughout the second half of the 20th Century,our nation’s cities were marred by the onslaught of unsustainable suburbanization and the expansion of limited access highways that ripped through urban centers and divided communities within them.Paired with systematic disinvestment from redlining and white flight,these forces combined to create lasting physical,social and economic hardships in cities across the US.Over the last 20 years,cities have rebounded in America and new patterns of thought focused on livability,walkability and urban form have started to sprout:from the Big-Dig in Boston to Octavia Boulevard and the Embarcadero in San Francisco,cities are reassessing the value of highways that solely move automobiles through cities,and have started to focus on how these pieces of infrastructure impact the daily lives and economic interests of a their residents and visitors.In Oakland,California,through the efforts of ConnectOAKLAND,the city is taking up the mantle of this new pattern of thought and is beginning the planning process to reconnect West Oakland to Downtown by transforming an underutilized freeway(I-980)into a multi-modal transportation corridor that reestablishes the historic urban grid.The project’s dual benefit will reconnect two of Oakland’s historic neighborhoods while better connecting Oakland along with the entire East Bay to San Francisco,San Jose and Silicon Valley through the incorporation of a second transbay tunnel for Bay Area Rapid Transit(BART),commuter rail(Caltrain),and high speed rail(HSR).This article will explore the ConnectOAKLAND vision for I-980 as a case study for current and future patterns of highway removal,and as a part of the national movement to rethink the role of urban highways and holistically re-envision the US transportation infrastructure.展开更多
Although food and affective pictures share similar emotional and motivational characteristics, the relationship between the neuronal responses to these stimuli is unclear. Particularly, it is not known whether perceiv...Although food and affective pictures share similar emotional and motivational characteristics, the relationship between the neuronal responses to these stimuli is unclear. Particularly, it is not known whether perceiving and imagining food and affective stimuli elicit similar event-related potential （ERP） patterns. In this study, two ERP correlates, the early posterior negativity （EPN） and the late positive potential （LPP） for perceived and imagined emotional and food photographs were investigated. Thirteen healthy volunteers were exposed to a set of food photos, as well as unpleasant, pleasant, and neutral photos from the International Affective Picture System. In each trial, participants were first asked to view a photo （perception condition）, and then to create a visual mental image of it and to rate its vividness （imagery condition）. The results showed that during perception, brain regions corresponding to sensorimotor and parietal motivational （defensive and appetitive） systems were activated to different extents, producing a graded pattern of EPN and LPP responses specific to the photo content - more prominent for unpleasant than pleasant and food content. Also, an EPN signature occurred in both conditions for unpleasant content, suggesting that, compared to food or pleasant content, unpleasant content may be attended to more intensely during perception and may be represented more distinctly during imagery. Finally, compared to LLP activation during perception, as well as imagery and perception of all other content, LPP activation was significantly reduced during imagery of unpleasant photos, suggesting inhibition of unwanted memories. Results are framed within a neurocognitive working model of embodied emotions.展开更多
文摘Throughout the second half of the 20th Century,our nation’s cities were marred by the onslaught of unsustainable suburbanization and the expansion of limited access highways that ripped through urban centers and divided communities within them.Paired with systematic disinvestment from redlining and white flight,these forces combined to create lasting physical,social and economic hardships in cities across the US.Over the last 20 years,cities have rebounded in America and new patterns of thought focused on livability,walkability and urban form have started to sprout:from the Big-Dig in Boston to Octavia Boulevard and the Embarcadero in San Francisco,cities are reassessing the value of highways that solely move automobiles through cities,and have started to focus on how these pieces of infrastructure impact the daily lives and economic interests of a their residents and visitors.In Oakland,California,through the efforts of ConnectOAKLAND,the city is taking up the mantle of this new pattern of thought and is beginning the planning process to reconnect West Oakland to Downtown by transforming an underutilized freeway(I-980)into a multi-modal transportation corridor that reestablishes the historic urban grid.The project’s dual benefit will reconnect two of Oakland’s historic neighborhoods while better connecting Oakland along with the entire East Bay to San Francisco,San Jose and Silicon Valley through the incorporation of a second transbay tunnel for Bay Area Rapid Transit(BART),commuter rail(Caltrain),and high speed rail(HSR).This article will explore the ConnectOAKLAND vision for I-980 as a case study for current and future patterns of highway removal,and as a part of the national movement to rethink the role of urban highways and holistically re-envision the US transportation infrastructure.
基金supported by funds from Carleton University (Faculty of Science)the Social Science and Humanities Research Council of Canadathe Canadian Institute for Health Research
文摘Although food and affective pictures share similar emotional and motivational characteristics, the relationship between the neuronal responses to these stimuli is unclear. Particularly, it is not known whether perceiving and imagining food and affective stimuli elicit similar event-related potential （ERP） patterns. In this study, two ERP correlates, the early posterior negativity （EPN） and the late positive potential （LPP） for perceived and imagined emotional and food photographs were investigated. Thirteen healthy volunteers were exposed to a set of food photos, as well as unpleasant, pleasant, and neutral photos from the International Affective Picture System. In each trial, participants were first asked to view a photo （perception condition）, and then to create a visual mental image of it and to rate its vividness （imagery condition）. The results showed that during perception, brain regions corresponding to sensorimotor and parietal motivational （defensive and appetitive） systems were activated to different extents, producing a graded pattern of EPN and LPP responses specific to the photo content - more prominent for unpleasant than pleasant and food content. Also, an EPN signature occurred in both conditions for unpleasant content, suggesting that, compared to food or pleasant content, unpleasant content may be attended to more intensely during perception and may be represented more distinctly during imagery. Finally, compared to LLP activation during perception, as well as imagery and perception of all other content, LPP activation was significantly reduced during imagery of unpleasant photos, suggesting inhibition of unwanted memories. Results are framed within a neurocognitive working model of embodied emotions.
