Rather than the generational line of inheritance (the vertical line of history), the transmission of affect, conceptually, presupposes a horizontal line of transmission: the line of the heart. The affects are not inherited, or not only inherited. They also flow from this one to that one, here and now, via […] the circulation of the blood. . . . What is at stake with the notion of the transmission of affect is precisely the opposite of the sociobiological claim that the biological determines the social. What is at stake is rather the means by which social interaction shapes biology. My affect, if it comes across to you, alters your anatomical makeup for good or ill. This idea, perhaps more than any other, stands neo-Darwinism on its head. It is directly at odds with the premise on which neo-Darwinian biology is based. In neo-Darwinian biology especially, the individual organism is born with the urges and affects that will determine its fate. Its predisposition to certain behaviors is part of its individual genetic package, and, of course, these behaviors are intrinsically affective. Such behaviors and affects may be modified by the environment, or they may not survive because they are not adaptive. But the point is that no other source or origin for the affects is acknowledged outside of the individual one. The dominant model for transmission in neo-Darwinism is genetic transmission. It is the main model for transmission in the life sciences as they stand at present, and the critical thing about it here is that its proponents ignore the claims of social and historical context when it comes to accounting for causation.
— Teresa Brennan, “The Transmission of Affect” p.74-75











