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Electrodermal activity during Lower Paleolithic stone tool handling.

Annapaola Fedato1, María Silva-Gago1, Marcos Terradillos-Bernal2

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This summary is machine-generated.

Handling Oldowan and Acheulean stone tools elicits distinct electrophysiological responses, indicating subtle perceptual differences. These findings shed light on the cognitive evolution of hand-tool interactions in human history.

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Area of Science:

  • Paleoanthropology
  • Cognitive Neuroscience
  • Human Evolution

Background:

  • Hand coordination and tool use are central to human evolution and cognitive development.
  • The transition from Oldowan to Acheulean tool technology around 1.7 million years ago marks a significant cognitive shift.
  • Understanding haptic exploration of these tools can reveal insights into early hominin cognitive abilities.

Purpose of the Study:

  • To investigate if distinct Lower Paleolithic tools (Oldowan vs. Acheulean) induce different electrophysiological reactions during haptic exploration.
  • To explore the relationship between tool characteristics and cognitive/emotional responses.

Main Methods:

  • Electrodermal activity (EDA) was measured during stone tool handling.
  • Forty-six right-handed adults with no archaeological background participated.
  • Changes in electrodermal response and level were analyzed in relation to Oldowan and Acheulean tool manipulation.

Main Results:

  • Electrodermal proxies for attention and emotion showed skewed distributions, with females exhibiting more variable and emotional engagement.
  • Acheulean tools required longer manipulation but elicited less emotional response compared to Oldowan tools.
  • Tool length, weight, and thickness influenced attention, emotion, and manipulation time.

Conclusions:

  • Subtle perceptual differences exist when handling Oldowan and Acheulean stone tools.
  • Hand-tool interaction variations provide insights into haptic and prosthetic capacities.
  • Analyzing perceptual changes in the archaeological record can illuminate evolutionary shifts in body-tool cognitive mechanisms.