VI. Life’s Cerebral Cognizance Becomes More Complex, Smarter, Informed, Proactive, Self-Aware

B. A Neural Encephalization from Minimal Stirrings to an Earthuman Cognizance

Smaers, Jeoroen, et al. The Evolution of Mammalian Brain Size. Science Advances. 7/18, 2021. Twenty two neuroresearchers from across the USA and onto Germany, the UK, Austria, Canada, Madagascar, South Africa and Australia provide a most comprehensive, quantified, graphic reconstruction of cerebral anatomies to date for this major animalia class. By view of its international occasion, one might consider the current advent of an emergent sapiensphere which is proceeding to learn how all manner of beings evolved and grew smarter on their way to this worldwise retrospect.

Relative brain size has long been considered as a measure of cognitive capacities. Yet, these views about brain size rely on untested assumptions that brain-body allometry is a stable scaling relationship across species. Using the largest fossil and extant dataset yet assembled, we find that shifts in allometric slope underpin major transitions in mammalian evolution and are often characterized by marked changes in body size. Our results reveal that the largest-brained mammals achieved their relative sizes by divergent paths. These findings prompt a reevaluation of the traditional paradigm and open new opportunities to improve our understanding of the genetic and developmental mechanisms that influence brain size. (Abstract excerpt)

Smith-Ferguson, Jules and Madeleine Beekman. Who Needs a Brain? Slime Moulds, Behavioural Ecology and Minimal Cognition. Adaptive Behavior. Online January, 2019. University of Sydney neurobiologists contribute to current realizations that an evolutionary continuum is evident from invertebrate rudiments all the way to complex animals. For example, familiar “cognitive” behaviors are found in insects (bees can count) and even for prokaryote bacterial colonies. As our Evolutionary Intelligence section conveys, this rising, cumulative acumen seems quite traces a central track. See also Van Duijn, Marc. Phylogenetic Origins of Biological Cognition: Convergent Patterns in the Early Evolution of Learning by Marc van Duijn in Interface Focus (7/3, 2017) for a similar perception.

Although human decision making seems complex, there is evidence that many decisions are grounded in simple heuristics. Such heuristic models of decision making are widespread in nature. To understand how and why different forms of information processing evolve, it is insightful to study the minimal requirements for cognition. Here, we explore the minimally cognitive behaviour of the acellular slime mould, Physarum polycephalum, in order to discuss the ecological pressures that lead to the development of information processing mechanisms. By highlighting a few examples of common mechanisms, we conclude that all organisms contain the building blocks for more complex information processing. Returning the debate about cognition to the biological basics demystifies some of the confusion around the term ‘cognition’. (Abstract)

Stern, Menachem and Arvind Murugan. Learning without Neurons in Physical Systems. Annual Review of Condensed Matter Physics.. 14/417, 2023. We record this chapter by University of Pennsylvania and University of Chicago physicists as an example of how even relative subsoil realms are yet being seen to possess stirrings of cognitive senses.

The ability of learning methods to solve hard inverse problems invites an effort to development physical learning in which physical systems adopt unique capacities on their own without computational design. It was recently realized that large classes of physical domains can learn through local rules by adapting their parameters in response to observed examples of use. We review recent work in the emerging field of physical learning, describe theoretical and experimental advances from molecular self-assembly to flow networks and mechanical materials. (Excerpt)

Stevens, Charles. An Evolutionary Scaling Law for the Primate Visual System and Its Basis in Cortical Function. Nature. 411/193, 2001. Allometric, scale-free laws likewise hold for neural development.

The conservation of these scaling relations raises the possibility that a similar basis for the scaling laws exists for all cortical areas. In this view, each cortical area would be provided with a map of some sort - perhaps one with very abstract quantities - and the job of the cortex would be to extract some characteristic of the map at each point that would be represented as a location code by the neurons in each map ‘pixel.’….A 3/2 power relation would result. (195)

Strausfeld, Nicholas. Arthropod Brains: Evolution, Functional Elegance, and Historical Significance. Cambridge: Harvard University Press, 2012. Arthropods represent the broad, ancient genera of invertebrate insects, arachnids, crustaceans, and myriapods. The senior University of Arizona neurobiologist offers a popular exposition on their precursor neural circuitry and surprising cognitive acumen.

In The Descent of Man, Charles Darwin proposed that an ant’s brain, no larger than a pin’s head, must be sophisticated to accomplish all that it does. Yet today many people still find it surprising that insects and other arthropods show behaviors that are much more complex than innate reflexes. They are products of versatile brains which, in a sense, think. Fascinating in their own right, arthropods provide fundamental insights into how brains process and organize sensory information to produce learning, strategizing, cooperation, and sociality. Nicholas Strausfeld elucidates the evolution of this knowledge, beginning with nineteenth-century debates about how similar arthropod brains were to vertebrate brains. This exchange, he shows, had a profound and far-reaching impact on attitudes toward evolution and animal origins. Many renowned scientists, including Sigmund Freud, cut their professional teeth studying arthropod nervous systems. The greatest neuroanatomist of them all, Santiago Ramón y Cajal—founder of the neuron doctrine—was awed by similarities between insect and mammalian brains. (Publisher)

Striedter, Georg. Building Brains that can Evolve: Challenges and Prospects for Evo-Devo Neurobiology. Metode. Vol. 7/Pg. 9, 2017. The Modern Synthesis combined population genetics with comparative morphology but had little or no use for embryology. The UC Irvine neuroscientist and author (search) scopes out a synthesis of bodily and cerebral evolutionary development within a 2010s sense of recapitulation between individual ontogeny and species phylogeny.

Evo-devo biology involves cross-species comparisons of entire developmental trajectories, not just of adult forms. This approach has proven very successful in general morphology, but its application to neurobiological problems is still relatively new. To date, the most successful area of evo-devo neurobiology has been the use of comparative developmental data to clarify adult homologies. The most exciting future prospect is the use of comparative developmental data to understand the formation of species differences in adult structure and function. An interesting «model system» for this kind of research is the quest to understand why the neocortex folds in some species but not others. (Abstract)

Striedter, Georg. Principles of Brain Evolution. Sunderland, MA: Sinauer, 2005. A University of California at Irvine neuroscientist gathers and explains many advances of the last two decades about how brains evolved from invertebrates to humans. An example is to compare two previously optional paths by which brains grow in size – “concerted” whereby distinct modules evolve in concert and size with each other, and “mosaic” whence regions enlarge (or shrink) independently. Upon observation, both modes are variously in effect, depending on the species and its environment. Another aspect is a steady scaling of brain size with body weight through evolution for fish, reptiles, birds, mammals and primates, suggestive of a generally emergent trend. Human brains are special because our late arriving, relatively large neocortex allows us to reconstruct and reflect upon these phenomena.

Striedter, George, et al. NSF Workshop Report: Discovering General Principles of Nervous System Organization by Comparing Brain Maps across Species. Journal of Comparative Neuroscience. 522/1453, 2014. A 27 person team of senior neuroscientists including Barbara Finlay, Hans Hofmann, Erich Jarvis, and Todd Preuss, outline a National Science Foundation program to study the common cerebral anatomy and intellect that is being found to distinguish every creature and kingdom. By our collaborative retrospect, life’s evolutionary development of body and brain is ever again becoming apparent as an embryonic gestation.

A 27 person team of senior neuroscientists including Barbara Finlay, Hans Hofmann, Erich Jarvis, and Todd Preuss, outline a National Science Foundation program to study the common cerebral anatomy and intellect that is being found to distinguish every creature and kingdom. By our collaborative retrospect, life’s evolutionary development of body and brain is ever again becoming apparent as an embryonic gestation.

Sumner-Rooney, Lauren and Julia Sigwart. Do Chitons have a Brain? New Evidence for Diversity and Complexity in the Polyplacophoran Central Nervous Systems. Journal of Morphology. 279/7, 2018. Oxford University and Queen’s University, Belfast neuroanatomists well quantify that these early invertebrates do indeed have a rudimentary semblance of a brain-like faculty. Thus life’s evolution can be seen to cerebrally and cognitively stir, sense and quicken from its original rudiments.

Three‐dimensional reconstructions from historic histological slides reveal unappreciated complexity in chiton nervous systems. The concentration and organisation of nervous tissue in the oesophageal nerve ring in eight species unambiguously qualify it as a true brain. (Editor)

Chitons are benthic marine molluscs found from the intertidal to abyssal depths across the globe. The class is characterised by eight articulated dorsal shell valves, which protect the foot, viscera and pallial cavity. Most species graze the substrata using a biomineralised radula. They lack cephalic eyes and tentacles, but possess an extensive network of sensory pores in the valves, of which some have evolved to form ‘shell eyes’ capable of true image formation. Their simple body plan (dorsal shell, ventral foot; anterior mouth, posterior anus) has been purported to reflect a plesiomorphic or ‘primitive’ state within mollusks. (1)

Thiebaut de Schotten, Michel and Karl Zilles, eds. The Evolution of the Mind and Brain. Cortex. 118/1, 2019. An introduction to this special issue with some 20 entries such as The Biological Bases of Color Categorization from Goldfish to the Human Brain, The Left Cradling Bias, Large Scale Comparative Neuroimaging, and The Hippocampus of Birds in a View of Evolutionary Connectomics.

Tosches, Maria. From Cell Types to an Integrated Understanding of Brain Evolution: The Case of the Cerebral Cortex.. Annual Review of Cell and Developmental Biology. Vol. 37, 2021. A Columbia University neurobiologist provides a summary survey to date of her collegial project to conceptually and experimentally reconstruct how neural net faculties formed and emerged with regard to Vertebrate phylogeny, forebrain neuroanatomy, tetrapartite palliams and more across invertebrates, fishes, reptiles, birds and mammals onto curious, brilliant sapient selves.

With the discovery of the incredible diversity of neurons, Ramon y Cajal and coworkers laid the foundation of modern neuroscience. Neuron types are not only structural elements of nervous systems but evolutionary units, because their identities are encoded in genomes. With the advent of high-throughput cellular transcriptomics, neurons can be compared systematically across species. Research results now indicate that the mammalian cerebral cortex is a mosaic of deeply conserved and recently evolved neuron types. This review illustrates how various neuron types is key to observations on neural development, neuroanatomy, circuit wiring, and physiology for an integrated understanding of brain evolution. (Abstract excerpt)

Trianni, Vito, et al. Swarm Cognition: An Interdisciplinary Approach to the Study of Self-Organizing Biological Collectives. Swarm Intelligence. 5/1, 2011. Computer scientists review innate tendencies in such creaturely assemblies not only toward a composite organismic state, but also to achieve an effective group intelligence.

Basic elements of cognition have been identified in the behaviour displayed by animal collectives, ranging from honeybee swarms to human societies. For example, an insect swarm is often considered a “super-organism” that appears to exhibit cognitive behaviour as a result of the interactions among the individual insects and between the insects and the environment. Progress in disciplines such as neurosciences, cognitive psychology, social ethology and swarm intelligence has allowed researchers to recognize and model the distributed basis of cognition and to draw parallels between the behaviour of social insects and brain dynamics. In this paper, we discuss the theoretical premises and the biological basis of Swarm Cognition, a novel approach to the study of cognition as a distributed self-organizing phenomenon, and we point to novel fascinating directions for future work. (Abstract, 3)

[Prev Pages]   Previous   | 7 | 8 | 9 | 10 | 11 | 12 | 13  Next