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SC
Dr. Sarah Chen
Stanford · NLP & interpretability
91
fit
Fairness + NLP projects overlap with her recent work.
Strong methods fit: model evaluation and interpretability.
Clear outreach angle for current trustworthy AI research.
Outreach angle
Ask how her lab is extending interpretability methods into fairness audits for real-world AI systems.
Peter Brown
· Visiting Professor of PracticeVerified
University of Minnesota · Doctor of Philosophy (PhD) in Public Affairs
Peter Hendee Brown is a licensed architect and certified planner with over 30 years of experience working in architecture, government administration, real estate development, and as an independent consultant. Throughout his career, he has served in roles including architect, owner, developer, and owner’s representative, working for public, private, and nonprofit clients. His research focuses on understanding urban redevelopment projects from multiple perspectives, including those of city officials, politicians, planners, property owners, developers, users, and neighbors. He is the author of the critically acclaimed book, America’s Waterfront Revival, which reinforces his expertise in public authorities, waterfront redevelopment, and urban redevelopment generally. His second book, How Real Estate Developers Think, offers insights into the mindset and motivations of real estate developers, helping communities better understand their role as entrepreneurial city builders. He teaches graduate courses in private sector real estate development, urban design theory, site planning, and urban design methods at the Humphrey School of Public Affairs.
Psychology of sport and exercise · 2025-08-06 · 3 citations
articleOpen accessSenior author
Elite athletes face a range of challenges throughout their careers including injury, selection, funding status, and retirement. To support athletes to plan for and overcome these challenges, Career Assistance Programs (CAPs) have been developed to support personal and professional development, yet engagement with these services remains low. The aim of this study was to explore the perceived barriers to athletes’ engagement with personal development within the UK High-Performance sport system. Underpinned by ontological relativism and epistemological constructivism, 15 elite athletes who were on a funded UK Sport World Class Olympic or Paralympic Program participated in semi-structured interviews. The dataset was analyzed using reflexive thematic analysis. Three themes were developed: The Athlete Bubble, outlines the barrier of the performance-driven culture, Head in the Sand reflects the fear of retirement, and Bridging the Employment Gap highlights the tension of meeting training demands with work opportunities. Findings reveal how cultural expectations, elite sport environments, coach-athlete relationships and scheduling conflicts inhibit athlete engagement with personal development. This study contributes to a deeper understanding of the cultural and systemic barriers that shape how athletes interpret and navigate their development journeys and offers direction for developing more integrated, athlete-centered CAPs. • The relentless focus on performance can discourage athletes from engaging in personal development. • Power, precarity, and culture in sport can constrain personal development. • Embedding personal development into performance plans shifts it from optional to essential. • Education for coaches and practitioners is key to legitimizing personal development in elite sport.
Psychology of sport and exercise · 2024-11-15 · 11 citations
articleOpen accessSenior author
The English Performance Lifestyle (PL) service is a Career Assistance Program that aims to support British elite athletes in their holistic development throughout their time in elite sport to support their mental health and career prospects during and following their careers as athletes. Yet, despite the widespread existence and significant funding dedicated to this service, researchers have identified how it is often not fully embedded or used by sport organizations. Therefore, the aim of this study was to extend previous research by understanding the barriers to the provision of the PL service. Underpinned by ontological relativism and epistemological constructivism, 25 Performance Lifestyle Practitioners (PLPs) working in elite sport participated in a qualitative survey and focus groups. The data were analyzed using reflexive thematic analysis. Four themes were developed: There's a Mountain to Climb, It's a Crowded Train, You Need an Elevator Pitch and A Seat at the Performance Table. These themes highlight the barriers PLPs face in supporting athletes with their growth and development during their athletic career. The results offer unique insight into PLPs' roles and the challenges they encounter. As such, we offer practical implications including the importance of organizational support, encouraging athletes to develop a multidimensional identity and a variety of narratives that would offer athletes and practitioners another way to be in elite sport. We also offer recommendations for future research aimed at advancing the practice of PLPs to optimize support for elite athletes, such as including diverse perspectives and including both athlete and practitioner voice in the development of Career Assistance Programs.
Periodic features of neural time-series data, such as local field potentials (LFPs), are often quantified using power spectra. While the aperiodic exponent of spectra is typically disregarded, it is nevertheless modulated in a physiologically relevant manner and was recently hypothesised to reflect excitation/inhibition (E/I) balance in neuronal populations. Here, we used a cross-species in vivo electrophysiological approach to test the E/I hypothesis in the context of experimental and idiopathic Parkinsonism. We demonstrate in dopamine-depleted rats that aperiodic exponents and power at 30-100 Hz in subthalamic nucleus (STN) LFPs reflect defined changes in basal ganglia network activity; higher aperiodic exponents tally with lower levels of STN neuron firing and a balance tipped towards inhibition. Using STN-LFPs recorded from awake Parkinson's patients, we show that higher exponents accompany dopaminergic medication and deep brain stimulation (DBS) of STN, consistent with untreated Parkinson's manifesting as reduced inhibition and hyperactivity of STN. These results suggest that the aperiodic exponent of STN-LFPs in Parkinsonism reflects E/I balance and might be a candidate biomarker for adaptive DBS.
The debilitating symptoms of Parkinson's disease, including the hallmark slowness of movement, termed bradykinesia, were described more than 100 years ago. Despite significant advances in elucidating the genetic, molecular and neurobiological changes in Parkinson's disease, it remains conceptually unclear exactly why patients with Parkinson's disease move slowly. To address this, we summarize behavioural observations of movement slowness in Parkinson's disease and discuss these findings in a behavioural framework of optimal control. In this framework, agents optimize the time it takes to gather and harvest rewards by adapting their movement vigour according to the reward that is at stake and the effort that needs to be expended. Thus, slow movements can be favourable when the reward is deemed unappealing or the movement very costly. While reduced reward sensitivity, which makes patients less inclined to work for reward, has been reported in Parkinson's disease, this appears to be related mainly to motivational deficits (apathy) rather than bradykinesia. Increased effort sensitivity has been proposed to underlie movement slowness in Parkinson's disease. However, careful behavioural observations of bradykinesia are inconsistent with abnormal computations of effort costs due to accuracy constraints or movement energetic expenditure. These inconsistencies can be resolved when considering that a general disability to switch between stable and dynamic movement states can contribute to an abnormal composite effort cost related to movement in Parkinson's disease. This can account for paradoxical observations such as the abnormally slow relaxation of isometric contractions or difficulties in halting a movement in Parkinson's disease, both of which increase movement energy expenditure. A sound understanding of the abnormal behavioural computations mediating motor impairment in Parkinson's disease will be vital for linking them to their underlying neural dynamics in distributed brain networks and for grounding future experimental studies in well-defined behavioural frameworks.
Adapting actions to changing goals and environments is central to intelligent behavior. There is evidence that the basal ganglia play a crucial role in reinforcing or adapting actions depending on their outcome. However, the corresponding electrophysiological correlates in the basal ganglia and the extent to which these causally contribute to action adaptation in humans is unclear. Here, we recorded electrophysiological activity and applied bursts of electrical stimulation to the subthalamic nucleus, a core area of the basal ganglia, in 16 patients with Parkinson's disease (PD) on medication using temporarily externalized deep brain stimulation (DBS) electrodes. Patients as well as 16 age- and gender-matched healthy participants attempted to produce forces as close as possible to a target force to collect a maximum number of points. The target force changed over trials without being explicitly shown on the screen so that participants had to infer target force based on the feedback they received after each movement. Patients and healthy participants were able to adapt their force according to the feedback they received (P < 0.001). At the neural level, decreases in subthalamic beta (13 to 30 Hz) activity reflected poorer outcomes and stronger action adaptation in 2 distinct time windows (Pcluster-corrected < 0.05). Stimulation of the subthalamic nucleus reduced beta activity and led to stronger action adaptation if applied within the time windows when subthalamic activity reflected action outcomes and adaptation (Pcluster-corrected < 0.05). The more the stimulation volume was connected to motor cortex, the stronger was this behavioral effect (Pcorrected = 0.037). These results suggest that dynamic modulation of the subthalamic nucleus and interconnected cortical areas facilitates adaptive behavior.
