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Twin Sisters with 3 interdigital loops and whorl in loop of humor

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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Patti on Sun Apr 08, 2012 4:22 pm

anand_palm wrote:You havent answered to my question on why penrose choose the forumla to represent palms alone but not fingers.
Anand

I don't know his motivation. Maybe it was because he was a mathematician.
Actually,
The formula works with the fingers because of the equality. Every loop has a triradius. Arch 0, Loop 1, Whorl 2. You would be adding the same number on each side of the equation T + 1 = D + L. One more triradius, one more loop.
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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Martijn (admin) on Sun Apr 08, 2012 5:32 pm

anand_palm wrote:Hello Patti, Matijm

Why was the formula by penrose for triraddi designed for palm alone why did he not take into account for fingerprints, this was question whicc i had asked long back in this forum on total number of triraddii for which martijn had mentioned about study about autism ect which he was doing research. Is there any reason why palmar tridaii is treated seperately, is there any evolutionary logic behind it.

Anand

Hi Anand,

I think you misunderstood the purpose of Penrose's rule: it only describes how the various dermatoglyphic elements (loops & triradii) relate to the number of fingers. And contrary to Patti's earlier suggestion (and also contrary to my earlier response), Penrose's rule ALWAYS works for malformed hands and feet, and it can be applied to the individual palms, soles... and the individual fingers and toes!

Because actually... Penrose's topological formula requires to be applied properly and understood in the perspective of the following observation for the palm and soles:

"Each of the triradii (except the essential ones, normally 4 per limb, on palms and soles) is accompagnied by a loop or tented arch."

http://onlinelibrary.wiley.com/doi/10.1111/j.1469-1809.1966.tb00530.x/abstract

(By the way, this passage confirms my earlier consideration that a palmar 'tented arch' should be understood/treated as an individual dermatoglyphic element... and not just as a isolated triradius without an accessory element - which was sort of suggested by Patti)


So, there is no extra-value to include the 10 fingerprints to the palms as well, because the fingers should by principle always be assessed as an phenomenon on its own - and contrary to the fingers... the palm is a much more complicated phenomenon to be assessed completely!

So you can even apply Penrose's rule to an individual finger or toe: by applying for the number of digits the number 1 into Penrose's formula for the digit-element D...!

(It probably requires further reading to understand the fundamental importance of Penrose's topological formula).

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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Patti on Sun Apr 08, 2012 9:23 pm

Hi Martijn,
It appears that Mr. Mukherjee (in your link) chose to add the tented arch and a pattern on the fingerprint with 3 triradii in order to make the formula work in all cases.

Penrose actually wrote that the fingerprint with the 3 triradii was the rare exception, and refers to the tented arch as counted as zero the same as an arch (although this is now in regards to intensity). See below in the pamphlet "Dermatoglyphics and Medicine" Lionel S. Penrose (1971):
(particularly note section 4 first and second paragraph)



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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Martijn (admin) on Sun Apr 08, 2012 10:10 pm

Patti wrote:Hi Martijn,
It appears that Mr. Mukherjee (in your link) chose to add the tented arch and a pattern on the fingerprint with 3 triradii in order to make the formula work in all cases.

Penrose actually wrote that the fingerprint with the 3 triradii was the rare exception, and refers to the tented arch as counted as zero the same as an arch (although this is now in regards to intensity). See below in the pamphlet "Dermatoglyphics and Medicine" Lionel S. Penrose (1971):
(particularly note section 4 first and second paragraph)




Hi Patti,

Thanks for sharing those materials from Penrose's 1971 article. I think it's especially interesting that Penrose adresses the issue of 'extralimital triradii'... which should explain how Penrose would approach your earlier example with 1 palmar loop featured by only 4 palmar triradii (unfortunately, in the symbolic representation of the original hand we can only guess how the ridges under the ring finger are aligned... maybe the presence of a large white region could indicate the presence of a triradius that somehow was not noticed by the observer???).


And yes, everything should be considered in the right perspective.... and elements from different perspectives should not get 'mixed' - unless explicit described!

Patti, I think it is quite obvious that Penrose's comments about the tented arch in the perspective of the issue of 'pattern intensity' should not be confused with the issue of the 'topological formula'.

And by the way... did you notice how Mukherjee is directly refering to Penrose's work from 1965 regarding the issue of how a palmar tented arch should be counted likewise as a palmar loop?

(I disagree with your suggestion that Mukherjee introduced an element that was not described by Penrose)


Therefore I think you got a little bit confused by mixing the 2 topics - though fortunately you already made that noticed in your own comment by writing the words:

"... (although this is now in regards to intensity)"


I don't think there is any space left for disagreement regarding how to apply Penrose's topological forumula, because all necessary elements are described in the Penrose article that you introduced + the Mukherjee article that I introduced.

I hope this now makes sense for you as well?

wave

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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Patti on Mon Apr 09, 2012 12:54 am

Hi Martijn,
I did not say the formula didn't make sense. I went in search of samples that didn't fit the description and found them.

I understand your doubts about the print with a missing triradius under the ring finger. I would have liked to see an actual inkprint.

From Danuta Z.Loesch "Quantitative Dermatoglyphics":




The tented arch does not fit the rules for topology as seen in these illustrations.

The whole theory rests on the loops being formed in the fields between the radiants and not flowing over the top of an aborted main line or radiant.





In this last illustration, fig 2.5, the closest to a tented arch would be the + 3 in the upper left corner. But that would imply that there are two more loops - not seen.


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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Martijn (admin) on Mon Apr 09, 2012 11:07 am

Patti wrote:...



In this last illustration, fig 2.5, the closest to a tented arch would be the + 3 in the upper left corner. But that would imply that there are two more loops - not seen.

Patti, instead of the +3 example.... my choice would be that the -1 example comes much more close to the 'tented arch' from a visual perspective: the upper example for a fingerprint and the lower example for the palm.

(But I have not read the text).


Regarding the +3 example I have the associaton with unusual fingerprints that are featured with 3 triradii (for example a fingerprint featured with a whorl + a loop).

And the 0 refers to an arch, 1 refers to a loop, 2 refers to a whorl (comparable with double loop), etc.

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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Patti on Mon Apr 09, 2012 2:17 pm

Martijn (admin) wrote:
Patti, instead of the +3 example.... my choice would be that the -1 example comes much more close to the 'tented arch' from a visual perspective: the upper example for a fingerprint and the lower example for the palm.

(But I have not read the text).


Regarding the +3 example I have the associaton with unusual fingerprints that are featured with 3 triradii (for example a fingerprint featured with a whorl + a loop).

And the 0 refers to an arch, 1 refers to a loop, 2 refers to a whorl (comparable with double loop), etc.

I considered the same one as you ( -1 ), but the other rules get in the way. A triradius is formed in a 'valley' and a loop is formed on a 'hill'. Also apparently there is an opposite flow of ridges involved in forming a loop as compared to a triradius.





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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Patti on Mon Apr 09, 2012 2:30 pm

zaobhand wrote:Hi Patti and Martijn,

I'm all for the inquiry, otherwise how could the interesting comments have been made to start with? Banana waving

lol!

Well... at least you can see how complicated it is just to form a single loop or a triradius. The twins obviously have mathematically complex features! Very Happy
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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Martijn (admin) on Mon Apr 09, 2012 2:44 pm

Patti wrote:
Martijn (admin) wrote:
Patti, instead of the +3 example.... my choice would be that the -1 example comes much more close to the 'tented arch' from a visual perspective: the upper example for a fingerprint and the lower example for the palm.

(But I have not read the text).


Regarding the +3 example I have the associaton with unusual fingerprints that are featured with 3 triradii (for example a fingerprint featured with a whorl + a loop).

And the 0 refers to an arch, 1 refers to a loop, 2 refers to a whorl (comparable with double loop), etc.

I considered the same one as you ( -1 ), but the other rules get in the way. A triradius is formed in a 'valley' and a loop is formed on a 'hill'. Also apparently there is an opposite flow of ridges involved in forming a loop as compared to a triradius.


Sorry Patti, I don't understand how the rules get in the way.

By the way, the geometric principles in figure 2.18 show how a triradius is formed at an irregular slope located BETWEEN the hill (e.g top of the volar pad) and the valley.

And by the way, did you notice how in figure 2.5 the shapes of +3, +2 and +1 sort of fit into the shapes of 0 and -1? This shows how one can combine these elements in order to construct the combination of elements that are seen in a real fingerprint.

(I think it all makes sense because loops (+1) are typically featured with a triradius (-1) ... resulting in that both features neutralize eachother; and regarding the counting this explains why the 'tented arch' is counted as an arch in terms of this nomenclature counting... in order to keep the netto counting result for a tented arch at zero)

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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Patti on Mon Apr 09, 2012 3:50 pm

Yes the loop and triradius cancel each other out when counting loops and triradii. But, I think this particular feature is an exception to their formula and basic topological rules, and a person must add justifications and explanations to make it fit. Perhaps Penrose covered this and we just haven't found the direct literature source yet. This is all about math and nothing is mentioned of the observation that the ridges develop from radial to ulnar in the palms. This would have to influence the initial direction of the flow of ridges starting with the index finger's triradius.



And by the way, did you notice how in figure 2.5 the shapes of +3, +2 and +1 sort of fit into the shapes of 0 and -1? This shows how one can combine these elements in order to construct the combination of elements that are seen in a real fingerprint.

I don't see how one fits into the other.... scratch .... but I do see how one can evolve into the other .... sort of pulled inside out.... one is rounded (+3) and the opposite becomes pointed (-1)....

Loesch describes it as:

" L - T = 2 + B - C This is illustrated in Fig. 2.5, where the presence of cusps disturbs the L - T relationship in the enclosed areas. As can be seen from the examples, the presence of an inward cusp (B) increases the L - T value by one, the presence of an outward cusp (C) decreases by one. "
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Re: Twin Sisters with 3 interdigital loops and whorl in loop of humor

Post  Patti on Wed Apr 11, 2012 1:09 am



Loesch points out that it's curious that humans do not have a quadradius. I find it interesting when you study the interdigal loops with the accessory triradii, you will notice that combined they represent 4 fields under one digit!!

Looking at the raja loop or loop between index and middle fingers, you can see one shared field is the loop, another is the field below the loop. Then each triradius has a separate non-shared field of its own, making for 4 fields shared between two triradii.
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