Not by Demography Alone: Neanderthal extinction and null hypotheses in paleoanthropological explanation

Neanderthal extinction is a matter of intense debate. It has been suggested that demography (as opposed to environment or competition) could alone provide a sufficient explanation for the phenomenon. We argue that demography cannot be a ‘stand-alone’ or ‘alternative’ explanation of token extinctions as demographic features are entangled with competitive and environmental factors, and further because demography should not be conflated with neutrality

Behavioural Modernity, Investigative Disintegration & Rubicon Expectation

‘Behavioural modernity’ isn’t what it used to be. Once conceived as an integrated package of traits demarcated by a clear archaeological signal in a specific time and place, it is now disparate, archaeologically equivocal, and temporally and spatially spread. In this paper we trace behavioural modernity’s empirical and theoretical developments over the last three decades, as surprising discoveries in the material record, as well the reappraisal of old evidence, drove increasingly sophisticated demographic, social and cultural models of behavioural modernity. We argue, however, that some approaches to identifying and categorizing modernity have not kept up with this new picture. This is due to what we term ‘Rubicon expectations’: classificatory and interpretive practices which look for or assume clear demarcations in behavioural and cultural processes. We develop a philosophical account of ‘investigative disintegration’ to capture how our understanding of behavioural modernity has changed, and how Rubicon-based practices have become inadequate. Disintegration, in the form we analyse, occurs when scientists’ conception of a phenomenon shifts sufficiently to reshape an investigation’s epistemic structure. For behavioural modernity, the explanatory weight which once lay on identifying ‘switch-points’ in the innate suite of hominin cognitive capacities, lies now in understanding the social and demographic environments that were capable of sustaining and nourishing more complex material cultures. Finally, we argue that the phenomenon itself has not disintegrated to the point that we are left with no interesting explanandum: for all its mosaic, disparate nature, there are still good reasons for behavioural modernity to retain its central place in investigation of our species’ origins

Beyond Reasonable Doubt: Reconsidering Neanderthal Aesthetic Capacity

An aesthetic sense—a taste for the creation and/or appreciation of that which strikes one as, e.g., attractive or awesome—is often assumed to be a distinctively H. sapiens phenomenon. However, recent paleoanthropological research is revealing its archaeologically visible, deeper roots. The sensorimotor/perceptual and cognitive capacities underpinning aesthetic activities are a major focus of evolutionary aesthetics. Here we take a diachronic, evolutionary perspective and assess ongoing scepticism regarding whether, and to what extent, aesthetic capacity extends to our evolutionary cousins, the Neanderthals. The goal of this article is twofold. First, it serves as a defence of the attribution of Neanderthal aesthetic capacity by marshalling archaeological data best explained by positing a Neanderthal aesthetic sense. Second, it offers an opportunity to make progress on understanding some epistemically relevant features of the wider debate in evolutionary aesthetics. First, we outline and analyse a range of distinct ‘sceptical arguments’ derived from attitudes and claims found in the literature and broader debate that aim to dial down the case for Neanderthal aesthetic capacity. We show that these arguments not only miss their target, they divert the debate away from more compelling questions. We then consider the case for protoaesthetic capacities and sensitivities in the Acheulean stone tool industry and argue that Neanderthals likely inherited the protoaesthetic package from ancient ancestors that they shared with H. sapiens. Finally, we sketch and defend a research agenda for framing Neanderthal aesthetic niche(s) beyond H. sapiens-derived standards, which we see as a priority for future archaeological, cognitive, and philosophical research. While we resist sceptical arguments and the often-implied inferiority of Neanderthals to humans, we also deny that Neanderthals and ancient humans were indistinguishable. Understanding the differences is an important goal of interpretation, and we apply this line of reasoning to the case of aesthetics

Pan‐Africanism vs. single‐origin of Homo sapiens: Putting the debate in the light of evolutionary biology

The scenario of Homo sapiens origin/s within Africa has become increasingly complex, with a pan-African perspective currently challenging the long-established single-origin hypothesis. In this paper, we review the lines of evidence employed in support of each model, highlighting inferential limitations and possible terminological misunderstandings. We argue that the metapopulation scenario envisaged by pan-African proponents well describes a mosaic diversification among late Middle Pleistocene groups. However, this does not rule out a major contribution that emerged from a single population where crucial derived features—notably, a globular braincase—appeared as the result of a punctuated, cladogenetic event. Thus, we suggest that a synthesis is possible and propose a scenario that, in our view, better reconciles with consolidated expectations in evolutionary theory. These indicate cladogenesis in allopatry as an ordinary pattern for the origin of a new species, particularly during phases of marked climatic and environmental instability

L'ALBA DELL'UOMO: INDAGARE LE ORIGINI UMANE MODERNE DA UNA PROSPETTIVA EVOLUTIVA ED EPISTEMICA

Questa tesi mira a contribuire allo sviluppo delle conoscenze evolutive ed epistemiche relative alla paleoantropologia del Pleistocene medio e superiore. Verranno analizzati quattro processi principali che stanno alle base della più recente ricerca sulle origini e l’evoluzione dell’uomo moderno: la speciazione di Homo sapiens; la transizione verso la “modernità comportamentale”; la mescolanza genetica con specie ominine “arcaiche” fuori dall’Africa; la costruzione di nicchia e l’espansione di areale a livello globale, qui affrontate dalla prospettiva della crisi climatica odierna. Per prima cosa, difenderò un’origine singola estesa di Homo sapiens, sulla base di un’analisi delle evidenze attuali e delle conoscenze evoluzionistiche, sostenendo che il contesto paleoclimatico e paleoambientale del Pleistocene medio africano ha probabilmente favorito un processo di speciazione allopatrica a partire da una popolazione ancestrale distribuita sul continente e morfologicamente diversificata. Verrà poi affrontata la dimensione comportamentale e archeologica del problema delle origini. Analizzerò l’evoluzione dell’agenda di ricerca sulla modernità comportamentale, sviluppando un account filosofico definito di “disintegrazione investigativa” e criticando approcci basati su “Rubiconi” che non hanno tenuto il passo con i nuovi standard di adeguatezza esplicativa. Affronterò poi la ricerca paleogenomica e discuterò le evidenze di ibridazione con specie arcaiche in relazione al problema dello status tassonomico di Homo sapiens e dei Neanderthal. Analizzerò l’apparente conflitto tra tassonomie basate su dati molecolari e quelle basate su tratti morfologici da una prospettiva diacronica sul processo di divergenza di linee evolutive, e da una prospettiva integrata sui diversi concetti di specie e criteri di delimitazione, difendendo su tali basi una distinzione a livello specifico. Infine, contestualizzerò il cambiamento climatico di natura antropica come un processo di costruzione di nicchia giocato su scala planetaria, mostrandone le radici profonde nella storia evolutiva di Homo sapiens e le conseguenze a lungo termine, che richiedono una risposta reattiva (counteractive niche construction) rispetto alle azioni precedenti per deviare dalla traiettoria verso una trappola evolutiva.This thesis aims at advancing evolutionary and epistemological knowledge of Middle and Late Pleistocene paleoanthropology, focusing on four main processes that are at the basis of cutting-edge research on modern human origins and evolution. These are the speciation of Homo sapiens, the transition to behavioural modernity, admixture with archaic hominin species outside Africa and human niche construction and global range expansion, here approached from the perspective of the current climate crisis. First, an extended single-origin for Homo sapiens will be defended on evidential and evolutionary grounds, arguing that the paleoclimatic and paleoenvironmental context of Middle Pleistocene Africa likely favoured an allopatric speciation process from a widespread and diversified ancestral population. Then the thesis will move to the behavioural and archaeological side of the origin problem. I will analyse the evolution of the research agenda on “behavioural modernity”, developing a philosophical account of “investigative disintegration” and criticizing Rubicon-based approaches that have not kept up with new standards of explanatory adequacy. I will then turn to paleogenomic research and discuss evidence of archaic admixture with respect to the taxonomic status of Homo sapiens and Neanderthals. I will approach the apparent conflict between molecular and morphology-based taxonomies from a diachronic perspective on lineage divergence and from an integrative perspective on different species conceptions and delimitation criteria, justifying on such grounds distinct specific status. Finally, I will frame anthropogenically-driven climate change as a niche construction process played at a global scale, having deep roots in Homo sapiens evolutionary history and long-term consequences that today require a counteractive response to prior actions to deviate from a potential evolutionary trap

What is a trait? Lessons from the human chin

The chin, a distinguishing feature of Homo sapiens, has sparked ongoing debates regarding its evolutionary origins and adaptive significance. We contend that these controversies stem from a fundamental disagreement about what constitutes a well-defined biological trait, a problem that has received insufficient attention despite its recognized importance in biology. In this paper, we leverage paleoanthropological research on the human chin to investigate the general issue of character or trait identification. First, we examine four accounts of the human chin from the existing literature: the mandibular differential growth byproduct, the bony prominence, the inverted T-relief, and the symphyseal angle. We then generalize from these accounts and propose a three-stage framework for the process of character identification: description, detection, and justification. We use this framework to reinterpret the four accounts, elucidating key points of contention surrounding the chin as well as other morphological characters. We show that debates over the chin carry broad and important biological implications that extend beyond this trait and that are not mere semantic issues of definition

Past Materials, Past Minds: The Philosophy of Cognitive Paleoanthropology

The philosophy of cognitive paleoanthropology involves three related tasks: (1) asking what inferences might be drawn from the paleontological and archaeological records to past cognition, behavior and culture; (2) constructing synthetic accounts of the evolution of distinctive hominin capacities; (3) exploring how results from cognitive paleoanthropology might inform philosophy. We introduce some distinctive cognitive paleoanthropological inferences and discuss their epistemic standing, before considering how attention to the material records and the practice of paleoanthropology can inform and transform philosophical approaches

Towards common ground in measuring acceptance of evolution and knowledge about evolution across Europe : a systematic review of the state of research

Background Relatively little information is available regarding the level of acceptance of evolution and knowledge about evolution in different educational settings in Europe. The aim of the present study is to fill this gap and provide a comprehensive overview of the current state of research regarding evolutionary knowledge and acceptance of students and teachers across Europe, based on a systematic literature review. Results We identified 56 papers for the period 2010–2020, presenting results for 29 European countries. Both knowledge and acceptance of evolution were assessed in 17 studies. Out of 13 instruments most commonly used in the literature, five have been used in the European context so far: ACORNS, CINS, I-SEA, KEE and MATE. Thirty-one other instruments were identified of which 16 were used in studies on knowledge and 15 in studies on acceptance. The extent of knowledge was hard to compare even within groups of the same education level due to the application of different instruments and assessment of different key concepts. Our results illustrate the persistence of misconceptions through all education levels. Comparing acceptance among different education levels and countries revealed a high diversity. However, a lack of evolution in curricula tended to be associated with rejection of evolution in some countries. European studies that investigated both acceptance of evolution and knowledge about evolution varied highly concerning the existence and strength of the relationship between these factors. However, some trends are visible, such as an increase of strength of the relationship the higher the education level. Conclusions The present review highlights the lack of a standardized assessment of evolutionary knowledge and acceptance of evolution across Europe and, therefore, of reasonably comparable data. Moreover, the review revealed that only about one-third of all studies on acceptance and/or knowledge about evolution provided evidence for local validity and reliability. We suggest the use of assessment categories for both knowledge and acceptance instruments to allow for interpretation and comparison of sum scores among different sample groups. This, along with prospective comparative research based on similar samples, paves the way for future research aimed at overcoming current biases and inconsistencies in results.European Cooperation in Science and Technology http://dx.doi.org/10.13039/501100000921Peer Reviewe

European first-year university students accept evolution but lack substantial knowledge about it: a standardized European cross-country assessment

International audienceBackground: Investigations of evolution knowledge and acceptance and their relation are central to evolution education research. Ambiguous results in this field of study demonstrate a variety of measuring issues, for instance differently theorized constructs, or a lack of standardized methods, especially for crosscountry comparisons. In particular, meaningful comparisons across European countries, with their varying cultural backgrounds and education systems, are rare, often include only few countries, and lack standardization. To address these deficits, we conducted a standardized European survey, on 9200 first-year university students in 26 European countries utilizing a validated, comprehensive questionnaire, the "Evolution Education Questionnaire", to assess evolution acceptance and knowledge, as well as influencing factors on evolution acceptance