LETTER TO (DELETED) RE LIGHTS FOR INTERROGATION

• Document Type: SPECIALCOLLECTION
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): 00146138
• Release Decision: RIPPUB
• Original Classification: U
• Document Page Count: 2
• Document Creation Date: December 17, 2024
• Document Release Date: January 15, 1983
• Publication Date: November 16, 1955

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As I told you I would, I was down in 7.-ashington for seVoral
ymotinzs,"and for that roason wns unablo to got to anewor your
quostions boforo this. First, as.concorns tho Ur..0 of flic%ering
lishts in intorrogationt The inquiror says thmt.it is "ovident
that this mothod is uzed to conflict� or exhaust the ruln;" actually
within recant years thero has boon a considerable interost mnons
neuro-physiologists, neurologists, and psychiatrists, an.: tho
phonomenon of increasod excitability 'of the motor cortex follewinr.
sensory stimulation end incidontal to this the use of strcbo*copic
light stimulaLion was devised hy Zonri Gastoaut, a rrench investigator
who first reportod on the conleinaticn or this typo of photie stimu-
lation with the added US3 or 7o havo had
air easel: or ltt-nt erNai r " Mte Dor'to"sr".1"'�'4
consido7toxperienco with this 7articularly in the activatiOn
or cort
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havo reportod on it qulte extensivoly..
It hao been rocognisod that internal light stimulation for
certain can cause a crand nal type of soixuro in a small parcentaco
of opiloptics� By *using this phonomcnon the cpiloptic throshold
'can bo established.
. !More are a fow persons who can hay� their cortex dri/on by,
certain froquoncios of stinulation and associated with this .
thoro arc zo-o peculiar dissociated experiencos. On occasion we
haw, had such persons uctuall.hallusimata. All of them have.somo
moasuro of illusions as C-F5i..toluomoo of this.
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It ovidcnt also that light is not tho only sesoorry stimulus
which can produco this cffoct. sonic activation has also: boon reportea
(sco Arollaneo at al) in =5 Olin. ::ourophysiol. 1D50, 2:t15-217.
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lbevombor 1S, D5.5
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Thoro is rathor extenolvo litaraturo on the subject which can bo
cotton togother for you if you wish.
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1111'*itel
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Vovor.:)or 1C,
You- nontion your r:illin -miss to h,le us obtain cortain
rtodl-
catio and �lincr;r: v:ore thcy not ordinarily available,. and r woftici.
Tit:m.111m to ask about tht) :�ausibility or rptbin;; a C-14 tar.::-.! ty,�
1r4:r.olLloa�.1 to ya..a cur planned war% on thr,
detoction of vari.ou3 n11.11011 i tho�ccntral norvous syltera
by utilizin; toe:mit-0:3 or hf.l.vinr, it fluareace
-under ultravi.olat As you can apprecinta,
oxtreAcly sztall quantities and for that rcason fool that it would ho
well to ha -more hurt il as to detect snail ntitio by
tiles U30 or a rarzloautocraph technique that is havint tho brain slices
to.ko their own flotosraphz oa fiba tho exposuro boir.t; accmplished
by tho proser.co of radioactivo carbon. �
will be clad to spell out the forezoing raoro dotail if it
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would ho helpful.. Then, too, scraotino ezo wo talkocl th!zut tho
possibility of our stuclyins nant'acrirte t9.xic,ity pro-rlecd swas
of the substar.co could he nada ay."7.11.1.7tble. .:o have sat up a procram
whoroby wo cor. lop:: into th'.1....r.i..7.00......ponr.alr.sa you r.ont r.o vdth a view
tcr.rard tho re^ r�-)."-.. b lo frc`or.-
17ith kindest regards.
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Sincoroly,
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