Two forms of retinal disparity

The retinal disparities in stereograms where the vertical alignment of pairs of homologous points in one eye differs from that in the other eye were found to be more effective than disparities that do not involve that kind of binocular difference. The presence of such “transverse disparities” was found to shorten the time elapsed until perceived depth was reported in four instances, in two simple stereogram pairs and in two different pairs of random dot pattern stereograms. In an experiment where binocular parallax was in conflict with an effect of past experience, the presence of transverse disparities caused binocular parallax to prevail. The presumption that the amount of perceived depth depends only on the amount of disparity (provided distances from the eyes are unchanged) and not on the configuration in which it manifests itself was found not to hold in stereograms containing transverse disparities.     

The constancy of the orientation of the visual field

Evidence is presented that the perceived immobility of the environment during tilting of the head from side to side results from a compensating process. This compensating process operates well only when peripheral vision is present. An objectively stationary environment was, for instance, not perceived as immobile during head tilting when vision was confined to the macular region of the retina. The compensating process could be rapidly altered by exposure to environmental tilting during and dependent on head tilting. Such adaptation had the result that some environmental tilting that normally is perceived led to apparent immobility.     

Nieuwentijt und der teleologische Gottesbeweis

Ohne ZusammenfassungVortrag bei der Gedächtnisfeier am 31. Aug. 1954 in Purmerend     

Extent-of-motion thresholds under subject-relative and object-relative conditions

The experiment was designed to discover the threshold extent of motion at medium speeds amounting to 41, 82, and 164 min./sec., and to compare the perception of motion arising from subject-relative displacement with the perception of motion arising from object-relative displacement. Extent thresholds were found while velocity was kept constant. Different groups of ten Ss were used for each displacement velocity, and for each S the extent threshold was twice obtained by the method of constant stimuli, once under subjectrelative and once under object-relative displacement conditions. Sensitivity to brief displacements of a continuously visible target was high; average thresholds ranged from 1.0 to 4.4 min. under the various conditions employed. The thresholds were higher for subject-relative conditions and the slower displacement velocities and lower for objectrelative conditions and faster displacements.     

FACTOR ANALYSIS OF A NEUROTICISM INVENTORY

The Lidvall neuroticism inventory is comprised of 25 questions referring to symptoms presumed to be connected with manifest neurotic anxiety. It was presented to 377 persons, an unscreened group with respect to neurotic symptoms, and a factor analysis with rotation to simple structure was performed.—Four factors could be identified: (1) manifest neurotic anxiety, (2) neurotic difficulties in interpersonal relations, (3) neurasthenic symptoms and (4) obsessive-compulsive symptoms. The factor scales were correlated with Neuroticism and Extraversion in MPI. Neuroticism was shown to be a heterogeneous factor. The correlation between Factor (2) and Extraversion was high.     

Book reviews

The Chances of Explanation: Causal Explanation in the Social, Medical, and Physical Sciences Paul Humphreys, 1989 Princeton University Press x+170 pp., £12.95 (paperback) ISBN 0 691 020286 8; £25.00 (hardback) ISBN 0 69107353 8

In Search of a Better World: Lectures and Essays from Thirty Years Karl Popper London, Routledge £25.00 (hardback)

Artificial Morality: Virtuous Robots for Virtual Games Peter Danielson, 1992 London, Routledge £35.00 (hardback) ISBN 0 415 034841; £10.99 (paperback) ISBN 0 415 07691 9

A System of Pragmatic Idealism Nicholas Rescher, 1992 Princeton, Princeton University Press 335pp., $37.50 (hardback)     

General problems of questioning research

Summary This paper outlines certain minimum conditions for setting up experimental research on questioning. A discussion is given of the problems involved in using the same kinds of question as in natural interactions, creating a naturalistic exchange between questioner and respondent, and enabling people to use other inquiry strategies besides questioning. It is argued that these issues merit attention not only because of methodological concerns, but also because they are likely to lead to important insights about questioning.     

Zu Einem Methodologischen Interpretationskonstruktionismus

Interpretari necesse est (Interpretation is necessary). This slogan is summarizing the methodological and epistemological essay concentrating on what can be called a transcendental interpretationism and a methodological interpretationism. This approach is combining a pragmatic interpretive approach with a constitutional quasi Kantian but more pluralistic and flexible epistemology. It takes up the assets of Nietzsches radical interpretationism without ending up in an interpretationist idealism. Though a basic fundamental insight is a statement of the interpretation-impragnatedness of any knowledge and experience whatsoever, there is nevertheless a possibility to combine a kind of critical realism with this interpretationist approach. Though we are always obliged to use interpretation-dependent epistemological schemata and concepts as well as theories (we have no non-interpretive concepts, theories and ways of gaining and constructing knowledge), we have still, for practical reasons, to presuppose an external independent world which can however only be described in interpretation-dependent terms. Even this epistemological model is certainly an interpretive one. If we distinguish between different levels of more or less variable interpretations (we cannot, by our very biological constitution, change primary interpretations built in to our biological constitution and make-up of sense-organs etc.), we can analyse and define truth as a relation between different levels and types of interpretations. The ideal of truth makes some sense of a concept of correspondence, though in the last analysis it is a combination of coherence-theoretical and pragmatic-constructivist ideas. — The model of an epistemological interpretationism has the advantage (by contradistinction, e.g., with critical rationalism) to be consistently applied to itself: The interpretive epistemology is certainly but an interpretational model itself. — The sketched interpretationism has certain similarities with Nelson Goodman's constructive interpretive pluralism and Hilary Putnam's internal realism, although there are slight, but decisive differences to be carefully observed. The differences have to do with the mentioned practical realism and the presupposition of one world in which we live. The similarities are greater with respect to internal realism. A decisive difference is only that you cannot, according to methodological and transcendental interpretationism, compel somebody towards the uniqueness of language use. There are always degrees of freedom and variation to change the usage of signs. There is no socially intended uniqueness and compulsory usage of signs and their meanings. Even within the language community the rules are always only conventionally realized and actualized. There is no real correspondence between signs and signs (or interpretive constructs, for that matter). Any correspondence whatsoever can only refer to interpretational constructs itself. Any classification, verification, selection and identification of facts, even any thinking of data and facts as such is in the last analysis dependent on interpretations. Even the conception of an epistemological subject is but an interpretational construct on a higher level.