<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div>Kurtzweil Does the analysis you seek in TSIN spike.</div><div><br></div><div>Kelly</div><div><br></div><div><div style="font-size:8px;color:#575757">Sent on the new Sprint Network from my Samsung Galaxy Note® 3</div></div><br><br><div>-------- Original message --------</div><div>From: spike <spike66@att.net> </div><div>Date:05/01/2014 10:06 AM (GMT-07:00) </div><div>To: 'ExI chat list' <extropy-chat@lists.extropy.org> </div><div>Subject: Re: [ExI] cool! locals create circuit board modeled on the human brain </div><div><br></div><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> extropy-chat-bounces@lists.extropy.org [mailto:extropy-chat-bounces@lists.extropy.org] <b>On Behalf Of </b>William Flynn Wallace<br><b>Sent:</b> Thursday, May 01, 2014 8:35 AM<br><b>To:</b> ExI chat list<br><b>Subject:</b> Re: [ExI] cool! locals create circuit board modeled on the human brain<o:p></o:p></span></p><p class="MsoNormal"><o:p> </o:p></p><div><div><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#0B5394">I read where the human brain is firing at a rate of four quadrillion time a second. Of course we don't want a computer to do all that our brain is doing but still.......<o:p></o:p></span></p></div></div><div><p class="MsoNormal"><span style="font-size:9.0pt;color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Indeed. We want the computer to do far more than our brain is doing.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Consider the above calculation. We have about 1E11 brain cells (I think that is the standard estimate, do correct me if I err.) If the above calculation of 4E15 is correct, then the average brain cell would need to fire 4E4 times per second. The standard estimate I have heard is a typical brain cell fires at about 200 Hz, for a 2E13 rate.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">BillW, have you a source please on your 4E15 number?<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Compare to a typical microprocessor. We have about a billion transistors (processor gurus, is this number approximately up to date?) so about a quarter of a billion gates, operating at about 4 billion Hz. If they all switched every cycle that would be about 1E18 “firings” (ignore for the moment the term may or may not be applicable.) If I go into task manager, I see that about 1% of the CPU is busy as a rough estimate. So perhaps 1E16, or I would be OK with your 4E15, give back another factor of 2.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">So the computer makes that specification, but the brain is a factor of 200 short?<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Over to you BillW.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">spike<o:p></o:p></span></p></div></div></body>