Humans are not unique in using tools. Nevertheless, human tool use differs from that known to occur in nonhumans. For instance, only humans spontaneously engage in object-object manipulations and employ a wide range of tools (i.e., human tool-use propensity). In addition, only human societies develop technical equipment, which is improved over generations (i.e., cumulative cultural evolution). Studies have focused so far on the nature of the knowledge involved in tool use. Although interesting, these studies do not offer answers as to the origins of human tool-use propensity or cumulative cultural evolution.

To modify our way of conceptualizing the cognitive basis of human tool use, it is needed to stress a largely overlooked aspect: Tools offer an economy by allowing the user to reduce the various costs (e.g., time) required to accomplish a task. If we keep in mind that tool use is also a matter of behavioral economy, several questions arise. Does the human tool-use propensity reflect the human ability to excel to direct toward the most economical options? Does cumulative cultural evolution reflect the human ability to extract from tool behaviors performed by conspecifics the ones that are the most economical? Except for one study we conducted, no study so far has examined how people evaluate the costs and benefits associated with tool use. Data on this issue are also lacking in neuroeconomics or behavioral economics.

The project ECOTOOL aims to initiate a series of studies on the cognitive basis of what we call “the tool-use related economy”. More specifically, the project aims to provide insights about the human tool-use propensity (Sections 1, 2, 3) and cumulative cultural evolution (Section 4). The questions raised are as follows: (1) Do humans correctly evaluate the costs and benefits associated with tool use? And, if not, what is the specificity of our cognitive system that can explain it? (Section 1: Experimental psychology); (2) Is there a common cognitive basis for the cost/benefit evaluation related to tool use and other risky behaviors? (Section 2: Neuropsychology); (3) Do humans differ from animal tool users in the way they evaluate tool-use related economy? (Section 3: Comparative psychology); (4) Can the cumulative cultural evolution be explained by the ability of humans to extract from tool actions performed by conspecifics the ones that are the most economical? (Section 4: Experimental psychology).