RICHARD AVENARIUS’ “KRITIK DER REINEN ERFAHRUNG” (CRITIQUE OF PURE EXPERIENCE): AN ENGLISH SUMMARY

The French-Swiss Professor in inductive philosophy Richard Avenarius (1843-1896), father of empirio-criticism together with Ernst Mach, is one of the most underrated and misunderstood philosophers ever. It mostly depends upon his terminology, which displays an insurmountable difficulty (Russo Krauss, 2015). However, influenced by the most innovative proposals of his times of transition between the Idealistic/Rationalist legacies and the new Materialistic/Scientific interpretation of reality – i.e, by cultural evolutionism, linguistics, biomechanics, entropy/energy and, above all, by the newborn experimental psychology -, Richard Avenarius produced a complete system of philosophy and innovative methods of investigation of the laws of knowledge (Tozzi and Peters, 2017). Chunks of his original ideas can be found not only in philosophers of mind after him such as Gestalt, phenomenalism, behaviourism, functionalism and cybernetics (Marr 1982), autopoiesis, dynamical systems theory (Churchland 2007; Richardson et al., 2014; Tognoli and Kelso, 2014), embedded/embodied mind (Gibson 1986; Friston 2008), topology of the brain function (Lewin 1936; Tozzi e t al., 2017) – but also in countless neuroscientific theories and approaches – e.g., nervous transduction via electric spikes (Nieuwenhuys et al., 2008), neural code’s cracking (Watanabe et al., 2014), consciousness (Tononi 2008); multisensory integration, Bayesian accounts (Friston 2010), symmetry breaks (Roldán et al., 2014; Tozzi and Peters, 2016; Sengupta et al., 2016) -. Our aim is to provide the first chronological English summary of his masterpiece, the “Kritik” (Avenarius 1908), to make English speakers aware of this ignored and pioneering thinker. The numbers in brackets provided below single out the original paragraphs of his book (Edition 1908). Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 20 September 2018 doi:10.20944/preprints201809.0403.v1


INTRODUCTION
The French-Swiss Professor in inductive philosophy Richard Avenarius (1843-1896), father of empirio-criticism together with Ernst Mach, is one of the most underrated and misunderstood philosophers ever. It mostly depends upon his terminology, which displays an insurmountable difficulty (Russo Krauss, 2015). However, influenced by the most innovative proposals of his times of transition between the Idealistic/Rationalist legacies and the new Materialistic/Scientific interpretation of reality -i.e, by cultural evolutionism, linguistics, biomechanics, entropy/energy and, above all, by the newborn experimental psychology -, Richard Avenarius produced a complete system of philosophy and innovative methods of investigation of the laws of knowledge . Chunks of his original ideas can be found not only in philosophers of mind after him -such as Gestalt, phenomenalism, behaviourism, functionalism and cybernetics (Marr 1982), autopoiesis, dynamical systems theory (Churchland 2007; Richardson et al., 2014;Tognoli and Kelso, 2014), embedded/embodied mind (Gibson 1986;Friston 2008), topology of the brain function (Lewin 1936; Tozzi e t al., 2017) -but also in countless neuroscientific theories and approaches -e.g., nervous transduction via electric spikes (Nieuwenhuys et al., 2008), neural code's cracking (Watanabe et al., 2014), consciousness (Tononi 2008); multisensory integration, Bayesian accounts (Friston 2010), symmetry breaks (Roldán et al., 2014;Tozzi and Peters, 2016;Sengupta et al., 2016) -. Our aim is to provide the first chronological English summary of his masterpiece, the "Kritik" (Avenarius 1908), to make English speakers aware of this ignored and pioneering thinker. The numbers in brackets provided below single out the original paragraphs of his book (Edition 1908).

CRITIQUE OF PURE EXPERIENCE (1888-1890) PREFACE AND GENERAL INTRODUCTION [1-39]
Avenarius starts from the two axioms of knowledge. The first establishes that every human individual originally accepts over against him: a) a spatial environment composed of manifold parts which stand in relation of dependence to one another, and b) other human individuals making manifold describable statements; c) what-is-stated is in some way dependent upon the environment. The second axiom says that the scientific knowledge is just a development of the pure knowledge, i.e. the non-scientific, simple and natural possible knowledge. It follows the empiriocritic assumption: when the human individual finds himself in the mist of the external environment, he states he's having an experience [1]. The concepts of matter, substance, soul, consciousness, causality, necessity, freedom, reality are not included in such assumption [38]. Follow then two (apparently) interchangeable propositions: if a statement comes from the environment, then the statement is an experience [2]; if a statement is an experience, then the statement comes from the environment [3]. Three questions follow: in what sense does the experience come from the environment [7]? In what sense is a statement an experience [8]? Do the two questions collimate or diverge [9]? The entire book will be devoted to the answers of these questions. Through analytic tools [14], a formal and general theory not only of the pure experience, but also of the human knowledge and action, can be displayed [11][12][13]. He includes no other standpoint than that where he stands. As the Greek philosopher, he stands in the turmoil of the market-place, not as buyer or seller, in order that he may just observe [16]. The next paragraphs explore the relationships among the tree members: the environment, the self and the human statements. The ever-changing environment displays variations in quality and quantity, space and time, simplicity and intricacy [20-23]. The environment is not just involved in experience, but is also regarded as threat, as disturbing influence capable of breaking down the maintenance of the individual. The environment must nevertheless be regarded also as favorable to maintenance, nourishment and protection [37]. The individuals who make statements are organisms who live in a linguistic community, are born, grow preserve for a while and die [24]. The statements are not sounds or noises, but words (or gestures, such as the lacrimal secretions which point to cry, or mimic movements) [25]. The sensations are the describable content of statements. The latter are not stationary, because they may change [29]. They are simple or complex, primitive or evolved. We cannot perceive the thoughts and the sensations of other men, but just assign to them thoughts and sensations analogous to ours. The human statements can be divided in elements (such as green, cold, hard, sweet) and in characters (qualifications like pleasant, nice, beneficial, unpleasant) [30]. The link between the environment and the statements is very dynamical [31][32][33][34][35][36]. When the environment changes (as an example, during a chemical-physical experiment), it follows a variation in the statement [31]. Further, the statements may vary even if the environment does not, and vice versa: as an example, if a child looks at the same figure, he can see each time something different. The same names or sounds may refer to different people or facts. Other times, the sensation from a sensory modality may evoke sensations from another: i.e., I see a fruit and feel its taste. Furthermore, the statements may change due to the different cultural background of every individual. There is however a part of the more comprehensive system of nervous central organs in which are collected the afferences and the efferences [70], by which the statements depend on: we do not need to care about its precise anatomical and physiological structure, because it has not yet been sufficiently ascertained by the experimental trials to find a localization for brain functions; besides, we have no need of this information for our purposes [72]. (note of the translator: hereafter we will term, slight improperly, this unidentified subsystem with the broad term of "brain"), The only notable thing is that there is a division of functional subsystems in brain [73], irrespective of differences in coordination, morphological development, functional relationships [75-77]. When somebody accepts over against him that the statement depends on the environment, he accepts over against him that the statements depends on the brain [79], in particular on changes in brain [80]. The statements depend on the environment just in the sense that the environment is able to modify the brain [82]. The variations of the environment are studied by the special sciences [82-83], while the variations of the individual, and in particular of his brain, are noteworthy and deserve a better explanation [85]. The environment acts on the brain directly or indirectly, through physiological -awareness, sleep, fatigue, training -or pathological changes -hallucinations, illnesses -[102-117], or variations propagated by other parts of the organism, such as the movements of vocal organs. A very important variation is the habituation, which may exert on the brain a temporary functional action, or a permanent organic one [116.] The statements do not directly depend on the environment, rather by brain variations, but the latter depend on the environment [127]. The whole psychical life is a function of the self-preservation of the organism within certain limits, or, in case itis becoming disorganized, is the function of the selfpreservation of a partial system of the organism [130]. The brain tends toward asserting itself, either in the individual, or social, or global organisms. The ideal environment is the maternal womb, where the self-preservation is utmost [133]. The highest levels of conservation [139] are achieved when an energetic equilibrium occurs in the brain between two opposite forces: the stimulus (the excitation of a nerve) and the material exchange (the metabolism). In other words[155], our maintenance is conditioned by an highly dynamical equilibrium between two opposite customary processes: work and nourishment. The brain alternates between these states of equilibrium and breaks [160]: when changes take place, there are also at hand the conditions which annul the change; then the brain approximates again to its maximum-maintenance. It consists in oscillations [160] between two phases, in deviation from a preliminary value and in approximating to it again. A process of change is itself compounded from various oscillations, characterized by many features [163-176] treated extensively in part two, including the central habituation [173]. Psychical processes come along the physiological processes of the restoration of equilibrium in living organisms. When the equilibrium of a brain is disturbed, it is always on account of a difference arising between the nutritive functions of the system and its work. It is unnecessary to deal further with the process of nourishment -we may even assume it to take place during the sleep [198,200]  . When the geographical and social environment widens to include the entire Earth surface and the entire mankind, the brain removes the accidental factors through a biomechanical process of progressive elimination.
The answer to the first question is thus the following: the environment is at the base of the experience only when he leads to variations in the individual brain, and only when a statement depends on environmental variations [435]. However, such values are valid just for a given individual, in a given moment: the individual final state changes from individual to individual, and also from place to place and from epoch to epoch.

PART TWO: SPECIFIC VITAL TRAINS [436-963]
Avenarius illustrates the particular cases of the general principles exposed in Part one, looking for the countless psychological correlates of the physiological vital trains. The general scheme is the following: when an individual makes a statement, a change in oscillations occurs in brain [455]. The statements depend upon the characteristics of the physiological variations in brain and its oscillations.
The oscillations in the brain display different characteristics, each one leading to different statements [162-175; 458-sgg]. We will go through a few case in points. The form of the oscillations affects all statements dependent upon the senses (touch, pressure, temperature, hearing, smell, taste and sight) [459]. The magnitude of the oscillation gives rise to the values of intensity, as "strong" or "weak" [461]. The relevance of the oscillation depends upon the significance which the partial system just affected has for the whole central organ, related to natural disposition and training. Although the magnitude may be the same, the oscillation will assume a different value if it affects a partial system which is or is not highly developed by its disposition and training. The varying relevance of the oscillation affects the feeling, moods, and so on, [464], while the direction is related to "pleasure" and "pain" [469]. The mode in which an oscillation is affected by practice and training is the familiarity, including the "real," "known," and "certain," and their variations. The habituation and its changes play once again a crucial role: they give rise to the "difference" [474] and the "identity" [476]: in other words, the more the same oscillation is repeated, the more the sensation is perceived as usual, the same [479]. Other values linked with changes in habituation are: the sure, the certain, the known, the familiar. The opposition of many oscillations gives rise to the sensation of prevalence and perception of finer details (discrimination), in which some sensations are highlighted by the attention, compared with the faded background sensations [505]. When the connexions of the oscillations vary, these latter become more active, more differentiated, more articulated. The concepts of thing, idea, arise from the mix of different oscillations [512; 535]. The things have a higher intensity than the ideas. When two oscillations are similar and the statement is perceived as the same, long chains of oscillations lead to: "all together", "always", "everywhere", progressively reaching the general concept of the total reality, the world. When the identical becomes rule, the rules become laws and the truths become sure, existing, while the different becomes exception [552 sgg]. In summary, to make an example: a statement as to its strength depends only upon the amplitude of the oscillations, as to its pitch depends upon the number, and as to its timbre depends upon the form.
The mental life falls into series, called the specific vital trains, with prearranged general features, characterized by three sections [775]. In the first section, at the start there is the expected value, stated by the individual as sure, true, known. Then enters a variation, stated as different, diverging, doubtful, unexpected, together with the feeling of pain, opposition, or uncertainty, inquietude, dissatisfaction [797, 842]. The second section is an effort to suppress the anomaly: the brain strives to remove this unpleasant experience, through complex mental processes or simple habitual actions. At the end, value is found in the final section, leading to the feelings of rest, satisfaction, certainty, truth and quiet of the brain [850]. The variations can be removed either through peripheral action (practical behavior) or through brain action (theoretical behavior). Avenarius stresses that each statement is influenced by type and magnitude of the individual's background [853], and that the final section is independent from the number or proceedings of the intermediate steps [857]. Furthermore, there are three ways to suppress the variations: (1) reduction of the unknown to the known; (2) gradual habituation to a change, so that the unknown becomes a known. (3) temporary substitution of one kind of change for another. However, due to the differences of the initial conditions among individuals, the ideas achieved in the third section could lead, after a while, once again from a known to an unknown. The ultimate suppression of variations occurs via the search for universal laws [888]. As times goes on, the individuals and the generations are in front of faster, simpler and unavoidable concepts [890]. The approximation will always be towards the identical highly generalized, unlimited concepts [891], independently from the initial steps. The universal concepts are characterized by simple, complete descriptions, by qualitative differences expressed in many ways and by formal equivalences expressed in different forms.
In a foremost paragraph, Avenarius examines the experience regarded as character [

PART THREE: THE MOST GENERAL CONCEPTS [964-1040]
Part three investigates the highest concepts, i.e. the final states corresponding to all the possible environment manifold parts, equipped with the maximum possible frequency and embracing all the possible historical contents of the statements [971]. The highest concept, expressed by the statement: "the whole is this" is the concept of the world. However, they still embrace not only the more general concepts, but also superfluous ones: indeed, many different concepts of the world were expressed during the history of mankind, because they were also related to genetic constrains, social groups and historical background [ . The provisional solutions to the enigma of the world are countless and the only way to find more general concept is to expunge the surplus components [996]: the more the concept of the world is spatially enlarged, including many communities and then the whole mankind, the more the solution is general and definitive, approximating a purified and exclusive experience [997,1030]. When the concepts of the world are many, if the space and time is long enough, they always tend towards the highest concept [998] and the brain is satisfied [1000]. During the cultural evolution, the concepts of the world are at first regarded as a positive experience, a perceived thing, an empiric knowledge; however, in a following phase of removal, they weaken and are regarded as non-empirical knowledge, pseudo-problems, until they gradually vanish and disappear [1022-1023]. The last phase is their reappearance in a distilled form, just as pure descriptions [1002-21, 1024, 1028]. The final, pure concepts of the world allow the brain to be entirely conditioned by the environment and the statements to be regarded as complete experience [1031,1040]. The answer to the third question is thus the following: a primitive experience (knowledge=naturally perceived) leads to addition of non-experience (either knowledge=perceived and knowledge=not perceived) until a definitive, just described, exclusive experience takes place (knowledge= purified perceived) [1034]. More advanced social groups may be closer than others to the pure concepts of the world, at least in some fields of knowledge [1035]: indeed, evolution does not proceed linearly nor uniformly and small groups of more civilized individuals have an important role in pushing forward the changes towards possible solutions of the problems [1036-37].