motivation, and behavior occurred at different prehistoric times, in different lineages of our ancestors. This may be relevant to discussions of evolution of language and cognition (Botha, 2003; Botha & Knight 2009).

I address the current differentiated state of these abilities in the human mind, as well as unifying mechanisms of interfaces-links, which make possible integrated human functioning. The paper concentrates on mechanisms of existing interfaces and their cultural evolution. Before describing in the next section mechanisms of language, concepts, and emotions mathematically I will summarize these mechanisms conceptually in correspondence with general knowledge documented in a large number of publications emphasizing certain aspects that have escaped close scientific attention in the previous research.

## 2.1 Primordial Undifferentiated Synthesis

Animals" vocal tract muscles are controlled mostly from the ancient emotional center
(Lieberman, 2000). Vocalizations are more affective than conceptual. Mithen (Mithen, 2007) summarized the state of knowledge about vocalization by apes and monkeys. Calls could be deliberate, however their emotional-behavioral meanings are probably not differentiated; primates cannot use vocalization separately from emotional-behavioral situations; this is one reason they cannot have language. 

Emotionality of voice in primates and other animals is governed from a single ancient emotional center in the limbic system (Deacon, 1989; Lieberman, 2000; Mithen, 2007). Cognition is less differentiated than in humans. Sounds of animal cries engage the entire psyche, rather than concepts and emotions separately. An ape or bird seeing danger does not think about what to say to its fellows. A cry of danger is *inseparably* fused with recognition of a dangerous situation, and with a command to oneself and to the entire flock: "Fly!" An evaluation (emotion of fear), understanding (concept of danger), and behavior (cry and wing sweep) - are not differentiated. Conscious and unconscious are not separated. Recognizing danger, crying, and flying away is a fused concept-emotion-behavioral *synthetic* form of cognition-action. Birds and apes can not control their larynx muscles *voluntarily*.

## 2.2 Language And Differentiation Of Emotion, Voicing, Cognition, And Behavior

Origin of language required freeing vocalization from uncontrolled emotional influences. 

Initial undifferentiated unity of emotional, conceptual, and behavioral-(including voicing) mechanisms had to separate-differentiate into partially independent systems. Voicing separated from emotional control due to a separate emotional center in cortex which controls larynx muscles, and which is partially under volitional control (Deacon, 1989; Mithen, 2007). Evolution of this volitional emotional mechanism possibly paralleled evolution of language computational mechanisms. In contemporary languages the conceptual and emotional mechanisms are significantly differentiated, compared to animal vocalizations. The languages evolved toward conceptual contents, while their emotional contents were reduced. Cognition, or understanding of the world, is due to mechanisms of concepts, also referred to as mental representations or models. Barsalou calls this mechanism situated simulation (Barsalou, 2009). Perception or cognition consists of matching mental concept-models (simulations) with patterns in sensor data. Concept-models generate top-down neural signals that are matched to bottom-up signals coming from lower levels (Grossberg, 1988; Perlovsky, 2001) In this simulation process the vague 