To: Ed Boyden From: jeffrey E. Sent Tue 7/22/2014 2:57:54 PM Subject: Re: my guess is biological hash functions exist yes as there might be an overide, three inhibition signals , threshold, discarding would eliminate the calculation, . error correction etc. On Tue, Jul 22, 2014 at 10:55 AM, Ed Boyden wrote: Sure... I guess I was thinking of this from a info theory standpoint, where if you can't recover the original, some info was discarded. But this is a tricky way to think. Best to stick to thinking about what one part of a network is computing, based upon what other parts of the networks will do with the signals received. On Tue, Jul 22, 2014 at 10:51 AM, jeffrey E. leevacationagmail.com> wrote: > Not sure if discarding , as opposed to a function with a defined limit > output . > On Tuesday, July 22, 2014, Ed Boyden wrote: >> Absolutely! Computation means discarding information (e.g., sensory >> information being transformed into a decision requires discarding some >> of the info -- a passive photocopier does no computation), and a hash >> is basically doing that, but a one-way function, and towards some >> fixed length. I think that is probably the way brains error check, » no? >> » Best, >> Ed >> On Tue, Jul 22, 2014 at 9:04 AM, jeffrey E. leevacation@gmail,com> wrote: » > >> > https://www.khanacademy.oraconotnics-finance-domain/core-financ,e/money-andbanIcing/bitcoin/v/bitcoin-cryptographic-hash-function » > » > -- » > please note >> > The information contained in this communication is >> > confidential, may be attorney-client privileged, may >> > constitute inside information, and is intended only for >> > the use of the addressee. It is the property of >> > JEE >> > Unauthorized use, disclosure or copying of this >> > communication or any part thereof is strictly prohibited >> > and may be unlawful. If you have received this EFTA_R1_00355843 EFTA01916238 >> > communication in error, please notify us immediately by >> > return e-mail or by e-mail to jeevacation@gmail com, and >> > destroy this communication and all copies thereof, >> > including all attachments. copyright -all rights reserved » -- >> Ed Boyden, Ph. D. >> Leader, Synthetic Neurobiology Group >> Associate Professor, MIT Media Lab and McGovern Institute, >> Departments of Biological Engineering and Brain and Cognitive Sciences >> Co-Director, MIT Center for Neurobiological Engineering >> New York Stern Cell Foundation-Robertson Investigator >> MIT, Room E15-421, 20 Ames St., Cambridge, MA 02139 >> email » offi » cell - » fax - >> s >> web - http://syntheticneurobiology.org >> twitter - http://twitter.com/eboyden3 > -- > please note > The information contained in this communication is > confidential, may be attorney-client privileged, may > constitute inside information, and is intended only for > the use of the addressee. It is the property of > JEE > Unauthorized use, disclosure or copying of this > communication or any part thereof is strictly prohibited > and may be unlawful. If you have received this > communication in error, please notify us immediately by > return e-mail or by e-mail to jeevacationegmail.com, and > destroy this communication and all copies thereof, > including all attachments. copyright -all rights reserved Ed Boyden, Ph. D. Leader, Synthetic Neurobiology Group Associate Professor, MIT Media Lab and McGovern Institute, EFTA_R1_00355844 EFTA01916239 Departments of Biological Engineering and Brain and Cognitive Sciences Co-Director, MIT Center for Neurobiological Engineering New York Stem Cell Foundation-Robertson Investigator MIT, Room E15-421, 20 Ames St., Cambridge, MA 02139 emai offic cell - fax - skyp web - ttp: sync eticneuro to ogy.org twitter - http://twitter.com/eboyden3 please note The information contained in this communication is confidential, may be attorney-client privileged, may constitute inside information, and is intended only for the use of the addressee. It is the property of JEE Unauthorized use, disclosure or copying of this communication or any part thereof is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by return e-mail or by e-mail to jeevacationAgmail.com, and destroy this communication and all copies thereof, including all attachments. copyright -all rights reserved EFTA_R1_00355845 EFTA01916240