Deep brain stimulation of the subthalamic nucleus is a clinically effective tool for treating medically refractory Parkinson’s disease, but its neural mechanisms remain debated. Previous work has demonstrated that STN DBS results in evoked potentials in the primary motor cortex, suggesting that modulation of cortical physiology may be involved in its therapeutic effects. Due to technical challenges presented by high-amplitude DBS artifacts, these EPs are often measured in response to low-frequency stimulation, which is generally ineffective at PD symptom management. This (...) study aims to characterize STN-to-cortex EPs seen during clinically relevant high-frequency STN DBS for PD. Intraoperatively, we applied STN DBS to 6 PD patients while recording electrocorticography from an electrode strip over the ipsilateral central sulcus. Using recently published techniques, we removed large stimulation artifacts to enable quantification of STN-to-cortex EPs. Two cortical EPs were observed – one synchronized with DBS onset and persisting during ongoing stimulation, and one immediately following DBS offset, here termed the “start” and the “end” EPs respectively. The start EP is, to our knowledge, the first long-latency cortical EP reported during ongoing high-frequency DBS. The start and end EPs differ in magnitude and latency, and the end, but not the start, EP magnitude has a significant relationship to ongoing high gamma power during the EP. These contrasts may suggest mechanistic or circuit differences in EP production during the two time periods. This represents a potential framework for relating DBS clinical efficacy to the effects of a variety of stimulation parameters on EPs. (shrink)

Many human cultural traits become increasingly beneficial as they are repeatedly transmitted, thanks to an accumulation of modifications made by successive generations. But how do later generations typically avoid modifications which revert traits to less beneficial forms already sampled and rejected by earlier generations? And how can later generations do so without direct exposure to their predecessors' behavior? One possibility is that learners are sensitive to cues of non‐random production in others' behavior, and that particular variants (e.g., those containing structural (...) regularities unlikely to occur spontaneously) have been produced deliberately and with some effort. If this non‐random behavior is attributed to an informed strategy, then the learner may infer that apparent avoidance of certain possibilities indicates that these have already been sampled and rejected. This could potentially prevent performance plateaus resulting from learners modifying inherited behaviors randomly. We test this hypothesis in four experiments in which participants, either individually or in interacting dyads, attempt to locate rewards in a search grid, guided by partial information about another individual's experience of the task. We find that in some contexts, valid inferences about another's behavior can be made from partial information, and these inferences can be used in a way which facilitates trait adaptation. However, the benefit of these inferences appears to be limited, and in many contexts—including some which have the potential to make inferring the experience of another individual easier—there appears to be no benefit at all. We suggest that inferring previous behavior from partial social information plays a minimal role in the adaptation of cultural traits. (shrink)

Although trustworthiness has been described as a source of competitive advantage, its value extends to organizational governance and wealth creation. We identify the importance of the commitment—compliance continuum in the decision to trust and note that trustworthiness is a subjective perception viewed through each person's mediating lens. That lens and each person's interpretation of the social contract impact one's commitment to cooperate. We suggest five propositions that integrate trustworthiness, governance, and wealth creation.

Although efforts have been made to increase the opportunities for American-born minorities to obtain doctoral degrees in business, the actual number of business students who are American-born minorities has been extremely low. At the same time more than half of all PhD candidates in business schools are foreign-born. We suggest that business schools owe an ethical duty to provide role models for minority business students, and that this duty can be achieved by initiating Doctor of Business Administration (DBA) programs that (...) can enable working professionals who are American-born minorities to obtain terminal degrees in business. We outline eight steps that can be taken to implement a viable and cost effective DBA program. (shrink)

Lectures by Sayyid Kamāl al-Ḥaydarī, written down by his disciple Shaykh ʻAlī Ḥamūd al-ʻIbādī.

Islamic modernism; Islamic philosophy; 20th century.

The conversation with Jill H. Casid and Anna Campbell is a reconceptualization of several themes to develop an aesthetic that incorporates notions of the necropolitical and redefines the concept of the Anthropocene as the Necrocene. The Necrocene implies an era marked by death, decay, and the consequences of human impact on the environment, as well as a critical reflection on the choices individuals and societies make that contribute to the transition from the Anthropocene to the Necrocene. These reflections serve as (...) cautionary tales or reflections on the unsustainable path of the Anthropocene. An important reflection in the interview is how queer and transgender people are using art and assemblages to refuse the terms of the current tensions of the culture wars. (shrink)

1. Moʻadim -- 2. Moʻadim 2. -- 3. Moʻadim 3.

We consider the evolutionary plausibility of Osiurak and Reynaud's arguments. We argue that technical reasoning is not quite the magic bullet that O&R assume, and instead propose a co-evolutionary account of the interplay between technical reasoning and social learning, with language emerging as a vital issue neglected in O&R's account.

On sayings and teachings of 11th century Fatimid Caliph.