120 



John B. Calhoun 



above Nb produce the greatest increase in 6/. Later equivalent increases in 

 N produce less and less increments to Of, frustration. 



Satiation deficit, dd, increases (Fig. 35) in a somewhat similar fashion 

 as df, but it takes somewhat larger increments in N to produce comparable 

 increments in dd. Whereas df most likely represents a quantity of social 

 nonspecific stressors, Od most likely reflects emotion of a kind which on the 

 human level we call sadness, foreboding, apprehension, or home sickness. 

 It represents the physiological consequences resulting from needed and 

 perhaps known social interaction. 



8=017424 



Fig. 35. Satiation deficit and frustration at greater than optimum group size. 

 The inset figure defines the N of ma.ximum decrease in the satiation d, per unit increase 

 oiN. 



A word of explanation is in order to reveal why I selected the nonfinite 

 Nh = 12.11 instead of 12.0 for examining Od in Fig. 35. In brief, I reasoned 

 that there must be some Od not compatible with maintaining social life at 

 that corresponding A". When this A^ is reached there must be some genetic 

 change transpiring which so reduces intensity of interaction that do may be 

 restored. On a rather arbitrary basis, I selected dd = 0.174, which is equiva- 

 lent to a 70^f decrease in 9a from do. Reacquisition of do at this N reciuires 

 i to decrease to 0.3 of its former level. By such criteria, successively larger 

 Ni, starting with Nb = 2, will form a series of 2, 12.11, 124.45, etc. Any 



'(3) 



such saltatorial series of Nb's may be designated N^ \ Ny, A" 



]V^"\ The dd curves for all A^6 of 12.11 and above will cross the 0.174 



horizontal dd line within the small black rectangular area superimposed on 



