The detection of visual intensity differences by pigeons

Pigeons were trained in a conditional discrimination procedure to discriminate between visual stimuli that varied in intensity. The magnitude of the intensity difference ranged from 0.80 to 0.05 logarithmic units. Psychometric functions were calculated from the data and the mean difference threshold for the 11 subjects was approximately 0.12 logarithmic units. A signal-detection analysis of the data suggested that stimuli that were below the calculated threshold were detectible to the subjects.     

Are moods cognitive?: A critique of Schmitt on Heidegger

Conclusion If, as Schmitt suggests, Heidegger bases the claim that moods are cognitive on the philosophical distinction between theoretical and non-theoretical knowing, then much of what Heidegger says in this connection turns out to be either unclear, trivially true, or else false. Yet Schmitt himself only occasionally seems to recognize how dubious this account really is. Moreover, in attempting to help Heidegger say what he means, Schmitt's interpretation in Chapter 5 falters. It falters because(1) the emphatic likening of moods to skills,(2) the introduction of the bizzare notion knowing how occurrently, and (3) the misconceiving of self-deception, are not to be found in Sein und Zeit. They represent, rather, an imposition upon Sein und Zeit from without. This fact means either that Schmitt's interpretation is faulty or else that it is as much reconstructive as explicative. And if reconstructive, then several conceptual mistakes are attributable to him more than to Heidegger. In spite of these difficulties Martin Heidegger on Being Human is a prize book. It attempts to understand a thinker better than he understood himself. And according to Schleiermacher this is the goal of every hermeneutic.In contrast to the successful parts of the book, the chapter on moods fails to make sense out of Heidegger's view - one reason being, I would guess, that Heidegger is, after all, equivocating on the German word Stimmung. Sometimes he uses it to refer specifically to states such as being depressed, being serene, being anxious. At other times he uses it to refer vaguely to Dasein's attunement to the world. If the human being is always already (immer schon) attuned to the world, and if such a posture toward the world is also considered a mood, then in some imprecise way one's being in a mood might be a necessary condition for any belief to affect him emotionally. But, of course, mood in this broad sense would indicate an ontologically, and not a causally, necessary condition. And so, it would not follow that every belief which affected one emotionally need have some specific mood (e.g., depression, serenity, anxiety) as its necessary causal antecedent. Nor would it follow that, as a matter of fact, a change of belief could not effect a specific change of mood.I fear that with regard to some topics the sense in which one understands Heidegger better than he understood himself may well be the original Socratic sense: one knows what Heidegger himself does not know, viz., that the conceptions of Sein und Zeit are not always intelligible. And one wonders whether any philosophical midwifery can really be of aid - at least with respect to the claim that moods are cognitive.     

Misuse,abuse, overuse,and unuse of on-line computer facilities by psychologists

This, then, is a very personal and informal view of some of the peculiar trends of computer application in experimental psychology. If there is any single point on which I would prefer to end, it would be a reiteration of my belief that, on the whole, the positive attributes and contributions to our science of on-line computers have far outweighed some of these nagging aggravations. Regardless of what has been done and in what way it has been done, it is certainly better to have done something than never to have done anything at all. Our science, like a computer program, is also contingent and self-adapting, and most minor strategic errors are quickly corrected. But no one can debug a computer program or a major technological movement without at least having pushed the startbutton.     

BASIC subroutines for on-line experiments using Hewlett-Packard computers

Modifications of the Hewlett-Packard version of the BASIC language to permit its use in data acquisition and control of on-line experiments are described. The resulting software system is an easy-to-use interpretative compiler.     

On the detectability of straight lines in visual noise: An extension of French’s paradigm into the millisecond domain

We report the results of a study that investigated the effects of four experimental parameters on the tachistoscopic detectability of dotted lines in a noisy background consisting of dynamic patterns of identical dots. Characteristics of the lines that were explored included dot spacing, dot numerosity, and line orientation. Dot spacing was shown to be the most powerful parameter in determining the masking effect: the closer the dots, the more easily the line was detected. Increasing the number of the dots was also effective in increasing the detectability of a line, but only up to a limit of five dots. The orientation of the line, on the other hand, did not alter its detectability. Increasing the density of the visual masking noise monotonically reduced the detectability of the line. These studies are an extension of French’s (1953, 1954) work, differing mainly in the fact that the stimulus material was presented tachistoscopically rather than in a mode that allowed prolonged (up to 5 sec) examination of the figures. Thus, they put the results in a domain in which physiological interpretations may be more critically evaluated. A comparison of the results suggests that essentially the same sorts of cognitive mechanisms are operating in the millisecond domain as in the longer exposures. This suggests that simple neurological models utilizing the concept of feature filters or detectors may be being prematurely applied to relatively complex perceptual processes.     

A primate restraint and handling system for auditory research

A set of devices is described that enables daily handling and restraint of large primates. The animals live in cages and wear a special collar that fits into a modified primate restraining chair. A chain and pole arrangement simplifies the daily chairing procedure. A method of head restraint and earphone mounting is also described.     

Tables of event sequences for sequential analyses of data in psychological experiments containing two-class events

Tables of sequences of two-class events are presented for use in programming psychological experiments in which behavior on trial n may be a function of the events of trials n ? 1, n ? 2, and/or n ? 3. Various factors related to schedule generation are discussed, i.e., restrictions on trial-block length which accompany sequential balance, interrelationships of trial blocks in the multiblock experiment, relationships between run length and r-tuple occurrences, and alternation behavior. Following a consideration of various methods of schedule generation for the two-class experiment, it was concluded that no method can result in schedules that possess all properties considered desirable in psychological experiments. However, the present sequences allow for sequential balance and analysis, and thus should prove useful in producing schedules in some contexts that are standard with regard to sequential influences.     

Violations of visual simultaneity

We present the result of two experiments that demonstrate an ability on the part of Os to detect asynchronies in visual stimuli with in the range of 0-100 msec. Such results are additional examples of an ability on the part of the human O to use information about temporal order to a precision beyond the usual results of visual “simultaneity” experiments. Thus the conventional nations of simultaneity and its corollary, the psychological moment, may be reflections of psychophysical technique rather than the biological function of sensory systems.