Neurophysiological Foundations and Dynamics of Consciousness
All conscious activity, including work, relies on fundamental neurophysiological mechanisms. First and foremost, memory processes are activated—both genetically determined and individually acquired throughout life. The brain initiates tightly organized dynamic stereotypes that allow learned actions to be executed automatically.
A key role is played by dominant motivation. It not only mobilizes memory and negative emotions (in the case of an unfulfilled need) but also forms an anticipatory reflection of reality—optimizing upcoming events. Representations of objects and potential interaction patterns are retrieved from memory.
The dynamics of consciousness are mediated by the mechanism of feedback afferentation (back afferentation). The central nervous system continuously compares two streams of information: the parameters of an internal need and environmental factors. This integration generates an understanding of the subjective "Self" versus the surrounding "non-Self," enabling active interaction with reality.
From the perspective of functional systems theory, consciousness is inextricably linked with intellect and represents the process of comparing current reality with past experience stored in the acceptor of action results. Two main forms of consciousness are distinguished: emotional (based on affective experience) and higher verbal (word-based) consciousness, which is unique to humans.
Structure of the Work Process
From a physiological perspective, the work process is not monolithic. It is divided into discrete, result-oriented segments termed system quanta. Each quantum necessarily concludes with the attainment of an intermediate or final socially meaningful productive outcome.
The evaluation of a worker's physiological functions must be conducted directly within real working conditions. The main criterion here is the degree to which physiological expenditures (energetic, neural, muscular) correspond to the outcome achieved.
This systemic approach has major practical significance:
- It allows for calculating the "physiological cost" of each individual system quantum.
- It enables early identification of the most strenuous stages of work that could lead to fatigue or marked psycho-emotional stress, allowing for appropriate preventive measures.
Types of Work: Limitations of Traditional Classification
Traditionally, work activity is divided into physical (manual) and mental labor. However, physiologists emphasize that this division is purely conventional. Strenuous physical work is impossible without cognitive control mechanisms, and mental labor frequently requires motor activity (e.g., fine motor control in an operator or surgeon).
Physical work is classified by the nature of muscular effort:
- Dynamic work: Involves the active spatial displacement of objects, loads, or control elements. It relies on marked isotonic muscular contractions.
- Static work: Relies on isometric contraction of muscle fibers. In this case, neither the load nor the body is moved through space, but the muscles sustain continuous tension (e.g., maintaining a forced posture or holding a heavy object).
Mental work is characterized by the predominance of cognitive components: it relies on intensive intellectual activity accompanied by a significant emotional component.
Work-Related Factors Affecting the Organism
A comprehensive set of factors influences a worker's physiological systems during task performance. Accounting for these factors is essential for designing safe and efficient work environments.
Key factors include:
- Work motivation: Determines the degree of engagement and mobilization of physiological reserves.
- Stereotypical repetitive activity: Establishes stable neural pathways in the CNS, but may lead to reduced attentiveness.
- Forced working posture: Induces static loads on the musculoskeletal system.
- Increased load on sensory organs: Particularly affecting the visual system.
- Monotony: Uniformity of actions that dampens central nervous system activity.
- Hypokinesia: Deficit of general physical activity (especially characteristic of mental labor).
- Psycho-emotional stress: Occurs in settings of high responsibility or severe time constraints.
- Environmental factors: Workplace temperature, noise, illumination, and other ambient parameters.