Yasushi Hirai

The adaptive landscape is standardly traced to Sewall Wright's 1932 address to the Sixth International Congress of Genetics. Thirty-seven years earlier, at the Third International Congress of Zoology in Leiden (1895), the French former naval engineer Armand Janet, a lepidopterist by avocation and a brother of Charles Janet, presented a mechanical model of evolution. Janet represents organic form as a point in a multidimensional space, the action of the environment as limiting surfaces (surfaces limitatives) that the point cannot cross, and a species as a stable equilibrium in a hollow of such a surface, reached when the tangential component of the resultant force vanishes. Crucially, evolution is driven not by the movement of the point across a fixed surface but by deformation of the surface itself as the environment changes; where the deformation is abrupt, intermediate forms are geometrically transient, which is how Janet accounts for the gaps between species. Drawing on the published proceedings (1896), this research note reconstructs Janet's treatment of individual variation, domestication and the double crest, contrasts it with Wright's landscape, and reviews the historiography from McCoy's rediscovery (1979) to the deflationary reassessment of Dietrich and Skipper (2012). Written in Japanese. Unrefereed research note.

This paper presents a comparative analysis of Kourken Michaelian’s Simulation Theory of Memory (STM) and Henri Bergson’s Theory of Memory (BTM), exploring both convergences and distinctions in their approaches to memory preservation and construction. The study examines four key features in which STM and BTM intersect: the constructive role of memory, the continuity between imagination and remembering, their differentiation through process monitoring, and their independence from causal preservation. This cross-boundary comparison, which differs in historical, linguistic, and contextual backgrounds, not only reveals surprising convergences but also introduces a novel interpretation of BTM. Close textual analysis shows that Bergson’s ‘actualization’ of pure memory is best understood as a suggestion-guided imitation: memory images actively model their virtual sources, rather than being metamorphoses of them or causally produced by them. Moreover, it elucidates the formation of generic images as a common ground between remembering, imagining, and recognition, interpreted as movements between the planes of the memory cone. Conversely, this restructured view of BTM also casts light back on STM, prompting new inquiries about its relationship with other types of memory and the necessity for general preservation.

This paper aims to refine the dependency thesis, which posits that episodic memory is necessary for acquiring the concept of pastness. By incorporating the hybrid concept thesis, which holds that pastness involves an irreducible experiential component, and the communicability constraint, which states that such experiential content cannot be acquired purely through linguistic or inferential means, this paper argues that pastness cannot be fully explained by relational properties alone. Developmental psychological evidence suggests that temporal cognition progresses in stages, with an early categorical sense of pastness emerging before the ability to structure time sequentially. At this early stage, individuals lack the capacity for time-place indexing, which reinforces the need for direct experiential access in forming the concept of the past. This structured framework clarifies why empirical objections—such as amnesia cases used to challenge the necessity of episodic memory—fail to undermine the dependency thesis. While patients with episodic memory loss retain some relational understanding of time, their concept of pastness remains indirectly dependent on the episodic memory of others. Similarly, critiques arguing that episodic memory is not sufficient for past concept formation conflate different stages of cognitive development, overlooking the necessity of early direct experiential awareness. By integrating philosophical and psychological insights, this paper provides a structured argument for the specific way in which episodic memory contributes to our understanding of time.