1 the thesis of “16 days”. 2 first there are two: t1t1
Post on 19-Dec-2015
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The thesis of “16 Days”
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first there are two:
t1
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t2
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but somewhere along the way there is one
t3
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t4
but somewhere along the way there is one
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but somewhere along the way there is one
t5
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but somewhere along the way there is one
t6
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but somewhere along the way there is one
t7
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Daniel is a substance
The sum of sperm and egg from out of which Daniel was formed is not a substance
Somewhere along the way a substantial change occurred
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What are the alternative candidate thresholds for
substantial change?
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a. single-cell zygote (day 0)b: multi-cell zygote (days 0-3)c. morula (day 3)d. early blastocyst (day 4)e. implantation (days 6-13)f. gastrulation (days 14-16)g. neurulation (from day 16)h. formation of the brain stem (days 40-43)i. end of first trimester (day 98)j. viability (around day 130)k. sentience (around day 140)l. quickening (around day 150)m. birth (day 266)n. the development of self-consciousness (some
time after birth)
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a. single-cell zygote (day 0)b: multi-cell zygote (days 0-3)c. morula (day 3)d. early blastocyst (day 4)e. implantation (days 6-13)f. gastrulation (days 14-16)g. neurulation (from day 16)h. formation of the brain stem (days 40-43)i. end of first trimester (day 98)j. viability (around day 130)k. sentience (around day 140)l. quickening (around day 150)m. birth (day 266)n. the development of self-consciousness (some
time after birth)
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a. single-cell zygote (day 0)b: multi-cell zygote (days 0-3)c. morula (day 3)d. early blastocyst (day 4)e. implantation (days 6-13)f. gastrulation (days 14-16)g. neurulation (from day 16)h. formation of the brain stem (days 40-43)i. end of first trimester (day 98)j. viability (around day 130)k. sentience (around day 140)l. quickening (around day 150)m. birth (day 266)n. the development of self-consciousness (some
time after birth)
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The thesis of 16 days
the substantial change occurs at the latest at 16 days after fertilization
with the conclusion of the process of gastrulation,
which is also the initiation of the process of neurulation
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Gastrulation
eatworms.swmed.edu/~leon/med_neuro/neurogenesis.ppt
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Perhaps the substantial change occurs much
earlierHelen Pearson,
“Your Destiny, From Day One”,
Nature 8 July 2002
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Helen Pearson:
“the first division of the egg
influences the fate of each cell
and ultimately all the tissues of the body.
“There is a memory of the first cleavage
in the whole of the rest of our life.”
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“What is clear… is that developmental biologists will no longer dismiss early mammalian embryos as featureless bundles of cells.”
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Speciecists say:
being human is a morally significant quality
human beings have a special moral status because they are members of the species homo sapiens sapiens
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A less controversial view:
Existing is a morally significant quality
and human beings begin to exist,
at the latest, at 16 days after fertilization
here: human being = human organism = human individual
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Daniel’s question:
what new morally significant feature is acquired at the stage of gastrulation (or at some much earlier stage)?
existingAnswer:
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Why is existing a morally significant quality?
If human beings have any morally significant qualities
then existing must be among them.
x has a morally significant quality means roughly: x is deserving of moral respect
Lemma: Only what exists is deserving of moral respect
Proof: Because ought implies can
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Candidates for morally significant qualities mentioned by Daniel:
– being self-conscious – having an interest in one's own future existence
These are both clearly qualities which only an existent being can possess (Daniel’s second candidate is even such as to involve a double recognition of the moral significance of existing)
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And if existing is a morally significant quality
then the question when an entity begins to exist, too, is a question with moral significance
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A response to this argument
PETERSINGERISM: the ‘person’ caper
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The philosophical tradition since Locke isn't really interested in the beginning of existence of human beings.
The interesting metaphysical problem is the problem when we, as persons, begin to exist.
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If, on the Petersingerist view
the question when human beings begin to exist is not morally significant,
then this must be because persons and human beings are two distinct entities
are they both substances?
Did Daniel begin to exist twice, once as human being, once as person?
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of course not
‘person’, like ‘student’ is a phase sortalIf student x has a morally significant quality,
then that is because x itself has a morally significant quality
And this means that x itself is the bearer of some sort of moral significance (thus x is deserving of respect and protection) from the beginning to the end of its existence
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END OF THE FIRST LESSON
Hence the moral significance of the question: when does a human being begin to exist