Contents

Section 1
Palaeoanthropology


Photogallery

Outline of Human Phylogeny

Evolutionary Trees
and DNA


Brain Evolution

Hand and Bipedality

Section 2
Social and socio-
cultural systems


Primate societies

Social relations and the evolution of culture

Social relations, communication and cognition

Human socio-cultural patterns

Tools and symbolic behaviour

Palaeolithic Art

Contemporary hunter-gatherer art

Section 3
Ontogeny and symbolism


Editorial Introduction: Ontogeny & Phylogeny

The role of ontogenesis

Brain, cognition, and language

Early interaction and cognitive skills

Language and thought

Theories of symbolization
and development


Children's drawings and the evolution of art

Section 4
Language systems


Spoken language and
sign language


The gestural primacy hypothesis

Comparative cognition

Animal language and cognition

Language acquisition

Language
reconstruction


The prehistory of grammar

Writing systems

Links

Links Policy

Relevant Links

Evolution of the hand and bipedality


Mary Marzke


Abstract
Symbolic behaviour among humans and non-human primates incorporates the hands, and in human ancestors opportunities to use the hand for this purpose must have increased with the evolution of habitual bipedal posture and locomotion. In tracing the evolution of human symbolic behaviour it is therefore important to trace the origins of human bipedality, and to explore the progressive changes in hominid hand structure and functions that may have affected the use of the hands in communication.

A comparison of modern human hands with those of non-human primates reveals features unique to humans. Functional analyses of these unique features have shown that they are consistent with the stresses and requirements for joint movements associated with effective use of hand-held paleolithic stone tools. Hominid fossil hands from the Pliocene and Pleistocene provide some evidence of the sequence in which these features evolved. Structural adjustments to bipedal posture in the earliest hominids may have been an important correlate to developments in the hand, facilitating the use of the trunk as leverage in accelerating the hand during tool-use.

The evolutionary state of manipulatory potential of hominid hands has probably never been a limiting factor in gestural communication or in the manual creation of symbols.

Links

A. afarensis AL-288-1 ('Lucy') under erect bipedal walking hypothesis, © Primate Evolution and Morphology Group, University of Liverpool

Some of the most interesting reconstructive work in this area is being carried out by the Primate Evolution and Morphology Group at the University of Liverpool, UK. See also their related simulated animation of the walking gait of the 1.5 million year old male teenage Nariokotome Homo erectus specimen.

References

Povinelli, D. and Davis, D.R. (1994) Deifferences between chimpanzees (Pan troglodytes) and humans (Homo sapiens) in the resting state of the index finger: implications for pointing. Journal of Comparative Psychology 108: 134-139