Human Evolution, Cultural Dynamics, and the Concept of Person

Pre-Evolutionary and Evolutionary Theories

Pre-Evolutionary Explanations and Fixism

The creationist theory is based on a literal interpretation of the Book of Genesis. Its basic theses were the fixed and definitive creation of all living species by God in His image and likeness. These conceptions assumed a fixist perspective, meaning the immutable character of species over time. They considered that the adaptability of individuals to the environment was solely the result or product of intelligent design. According to them, this evidenced the existence of a creator behind every life design.

In the eighteenth century, fixist creationism had defenders such as Carolus Linnaeus and Georges Cuvier. They maintained that adaptation to the medium was the product of divine design. Paradoxically, despite their fixist convictions, the classification studies in zoology and botany by Linnaeus and Cuvier served as the very foundation that supported the first evolutionary conceptions of the origin of species.

Evolutionary Explanations and Darwinism

The publication of Charles Darwin's work On the Origin of Species marked the breakdown of fixist doctrines. In it lie the bases of evolutionary explanations. The fundamental Darwinian theory is composed of three main theses:

• Species evolve through continuous transformations.
• Natural selection is the explanatory principle of evolution.
• Human beings descend from ancient primates.

This theory of change was confirmed by numerous paleontological findings. However, Darwinian theory did not initially explain the mechanisms by which hereditary characteristics were determined and transmitted from generation to generation. This limitation was resolved by Gregor Mendel, who showed that hereditary traits are determined by specific factors, which were later named genes.

Mendel's studies began a long tradition of biological inheritance research that explains changes in species characteristics through mutations or alterations in the genetic code. The combination of natural selection and mutationist doctrines forms the basis of neo-Darwinian theories, which complete our current understanding of evolution.

The Process of Hominization

The most important anatomical and behavioral transformations that took place during the hominization process include:

Erect Position and Bipedalism

Unlike other primates, human ancestors were characterized by bipedal walking without using their hands for support. Vertical or erect locomotion provoked a series of major anatomical changes: the loss of prehensile capability in the feet, alterations in spinal curvature, and the strengthening of the neck. It enabled wider visual observation of natural spaces and freed the upper limbs during displacement.

Liberation of the Upper Extremities

Walking upright allowed the hands to specialize in functions other than locomotion, such as handling objects, hunting, defense, and construction. The hands replaced the mouth as an organ for defense and labor, facilitating the invention and use of all kinds of instruments.

Brain Development

From Australopithecus to Homo sapiens, brain size tripled and became significantly more complex. Many scholars agree that freeing the hands served as a primary stimulus for this development: greater precision in handling and manufacturing objects required a higher mental capacity to conceive and design them, and conversely, greater cerebral capacity fostered greater manual dexterity. Brain development also made possible the emergence of technical and symbolic capacities in human beings.

Professor André Leroi-Gourhan proposed an alternative chronological development: it was the incipient use of tools that prompted hominids to free their hands and adopt an upright posture, which subsequently enabled the cranial cavity to expand, increasing the size and complexity of the brain.

Technical Capacity

Technical capacity is the ability to manufacture and use instruments to modify the environment and satisfy our specific needs. Throughout history, an increase in the effectiveness and sophistication of technical methods and tools is readily observed.

Language and Symbolic Capacity

Thanks to language, human beings are capable of generalization and abstraction, as well as referring to past, future, or imaginary realities. For many thinkers, language represents a qualitative difference—a specifically human feature.

Various theories examine the origin of language as we know it today, an area scientifically investigated through the phylogenesis of language. It is widely supposed that articulated language evolved from a primitive gestural language. Several hypotheses address how, when, and why gestures transitioned into speech:

• A genetic mutation sparked a specialization that initiated a long, complex evolutionary process.
• A progressive increase in general intelligence favored the emergence and growth of linguistic and symbolic abilities.
• The generalization of gestural alarm signals led to their gradual combination with vocal sounds.

These three theories may well be complementary, providing a multicausal explanation for the origin of language.

Symbolic capacity is the human ability to create and express meaning through symbols. Symbols are signs that stand in place of another reality that they represent and replace. Conventional symbols maintain no intrinsic causal or physical relation of resemblance to what they represent; rather, that connection is established and agreed upon by people.

Cultural Dynamics

It is an indisputable fact that human cultural information is continuously changing. These transformations occur through a process termed cultural dynamics. Cultural traits have evolved over time as recorded by history, ethnology, and archaeology, and are interpreted through social dynamics.

Mechanisms of Cultural Transformation

Five principal types of cultural transformation have been established:

• Cultural mutation: Involves introducing new content or modifying existing content. It can occur intentionally through invention, or unintentionally through copying errors during the imitation process.
• Cultural transmission: Occurs in a vertical manner (from parents to children across generations) or in a horizontal manner (between individuals of the same generation).
• Cultural diffusion or contagion: Involves the transfer of elements from other cultures and adopting them as one's own. This can occur spontaneously or through external imposition, the latter being termed acculturation.
• Cultural drift: Occurs when a culture fragments into distinct cultural groups or subgroups.
• Cultural selection: Happens when cultural innovations prove effective, are preserved, and are rationally chosen and preferred by group members.

The Philosophical Notion of the Person

Historical Evolution of the Concept of Person

The origin and evolution of the term "person" spans several historical stages:

• Classical Antiquity: The etymological origin lies in the Latin word persona, which referred to the theatrical mask worn by actors, derived from the Greek prosopon ("face" or "what looks forward"). In neither case did it represent the full philosophical concept of a person as understood today.
• The Middle Ages: Within Christian thought, the word "person" came to denote the human being as a unique creation of God, conferring dignity and intrinsic worth. Boethius formulated the classic definition: "The person is an individual substance of a rational nature."
• The Contemporary Era: The concept expanded alongside principles of human rights, liberty, and moral autonomy. A person is recognized as an end in themselves, deserving unconditional respect for their inherent dignity.

Contemporary Personalism

Among modern frameworks, contemporary personalism stands out, with Emmanuel Mounier as a prominent exponent. Personalism highlights openness toward others, an ethical dimension as a foundation of values, social commitment, and solidarity. A person is not an entity closed once and for all, but an ongoing process—an open task carried out through time.