How bipedalism shapes humans’ actions with hand tools

Author:

Fragaszy Dorothy M.1ORCID,Kelty-Stephen Damian G.2ORCID,Mangalam Madhur3ORCID

Affiliation:

1. Department of Psychology, University of Georgia , Athens, GA 30602, USA

2. Department of Psychology, State University of New York at New Paltz , New Paltz, NY 12561, USA

3. Division of Biomechanics and Research Development, Department of Biomechanics, Center for Research in Human Movement Variability, University of Nebraska , Omaha, NE 68182, USA

Abstract

The task for an embodied cognitive understanding of humans’ actions with tools is to elucidate how the human body, as a whole, supports the perception of affordances and dexterous action with objects in relation to other objects. Here, we focus on the relationship between humans’ actions with handheld tools and bipedal posture. Posture plays a pivotal role in shaping animals’ perception and action dynamics. While humans stand and locomote bipedally, other primates predominantly employ quadrupedal postures and locomotion, relying on both hands and feet to support the body. Drawing upon evidence from evolutionary biology, developmental psychology and performance studies, we elucidate the influence of bipedalism on our actions with objects and on our proficiency in using tools. We use the metaphor of cascades to capture the dynamic, nonlinear transformations in morphology and behaviour associated with posture and the use of tools across evolutionary and developmental timescales. Recent work illustrates the promise of multifractal cascade analysis to reveal nonlinear, cross-scale interactions across the entire body in real-time, supporting the perception of affordances for actions with tools. Cascade analysis enriches our comprehension of real-time performance and facilitates exploration of the relationships among whole-body coordination, individual development, and evolutionary processes. This article is part of the theme issue ‘Minds in movement: embodied cognition in the age of artificial intelligence’.

Funder

National Institutes of Health

Publisher

The Royal Society

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1. Minds in movement: embodied cognition in the age of artificial intelligence;Philosophical Transactions of the Royal Society B: Biological Sciences;2024-08-19

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