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By Gordon Pask, Warren S. McCulloch

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Extra resources for An Approach to Cybernetics

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_- . : ,"..... ", '\onrthJ . " " ' - ... loci I I pia",. nd;a,o...... oj: _ t... poho ·lrtIfidoI lKW .... ' '~ pcflo4l ,"'" thot. ~ '" . "..... " ,.... l"ifra e ,op"~ctiofl' gr, ""'~;',;:,::: but go to 01 ... dlml, "'-''''''I'"d. M r,::::--:R:':DdQU~ Fig. 17 (ii). An imitative unit, made up of singte action autonomous elements (equi valently 'artificial neuroncs'), performs trial s upon in environmen t and also interrogates an internal 'memory', (Each 'memory' register is represented by a small circle at a line intersection).

A, 2) ... 1sed, either 'P (a, m) or 'P (b, 11/) will approach I and the other will app roach O. The stationary values 'P (i. 111) are no more nor less than time averages '1 (i, t) of Chapter 3. Referring to our decision rule, A = a if B = a, A = if P • A signal resolved into evidence in favour of onc of two possible positions or batch numbers is, of cour~, absurd. Commonly we are concerned with distribution functions . But the simple case is illustrative. , " "" ,. AN APPROACH TO CYBERNETICS CONTROL SYSTEMS B = b, action (or instruction) a.

1. 1. per minute. The regulation is bound up in a whole chain of systems concerned with transporting oxygen and carbon dioxide. When oxygen passes through the alveoli and into the blood stream most of it is carried in chemical combination with haemo- • 76 AN APPROACH TO CYBERNETICS I globin, a substance which exists only inside the red blood corpuscles. Haemoglobin has two chemical forms, namely, oxygenated haemoglobin (HB) OX, and reduced haemoglobin (HB) RE. These forms exist in equilibrium. Oxygen + (HB) RE ~ ~cid + (HB) OX ........

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