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Updated: Aug 12, 2026
26:43
Computer-Generated Animal Model Stimuli
Published on: July 29, 2007
Immediate animation: Thomistic principles applied to Norman Ford's objections
1Prelature of Opus Dei.
Summary
Scholars debate when a human embryo gains a soul, often linking it to the primitive streak after week two. Philosophical realism argues ensoulment occurs at fertilization, with twinning indicating a new embryo, not disproving the first
Area of Science:
- Philosophy of Biology
- Embryology
- Metaphysics
Background:
- Scholarly debate exists regarding the timing of ensoulment in human embryos.
- Norman Ford and others propose ensoulment requires the primitive streak, post-week two, precluding twinning.
Purpose of the Study:
- To refute arguments that ensoulment is contingent on the primitive streak and excludes twinning.
- To establish the timing of ensoulment based on philosophical realism.
Main Methods:
- Philosophical argumentation
- Analysis of principles from Aristotle and Aquinas
- Conceptual analysis of zygote development and individuality
Main Results:
- The union of paternal and maternal DNA forms a new substance with a rational soul.
- The primitive streak is a developmental stage, not a prerequisite for ensoulment.
- Twinning signifies the development of a new embryo from totipotent cells, not the absence of an earlier ensouled embryo.
Conclusions:
- Human ensoulment occurs at fertilization with the formation of the zygote.
- The development of the primitive streak and twinning are compatible with ensoulment from conception.
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