Emotional processing following cortical and subcortical brain damage: contribution of the fronto-striatal circuitry

The present study examined the differential contribution of cortical and subcortical brain structures in emotional processing by comparing patients with focal cortical lesions (n = 32) to those with primarily subcortical dysregulation of the basal ganglia (Parkinson's disease n = 14). A standardized measure of emotional perception (Tübingen Affect Battery) was used. Only patients in the more advanced stages of Parkinson's disease and patients with focal damage to the (right) frontal lobe differed significantly from controls in both facial expression and affective prosody recognition. The findings imply involvement of the fronto-striatal circuitry in emotional processing.     

Criminal defenses and pleas in mitigation based on amnesia

Criminal defendants often claim to suffer from amnesia in connection with the events that are the basis of the criminal charges made against them. These claims present difficult problems of proof. Moreover, there are various defenses and opportunities to make pleas in mitigation which present a number of contexts in which evidence of amnesia can be introduced into the criminal trial. This article will examine the significance of amnesia in relation to: (1) a defense based on lack of mens rea; (2) a defense based on diminished capacity; (3) the insanity defense; (4) lack of fitness to stand trial; and (5) sentencing and the death penalty.     

Attentional tracking and inhibition of return in dynamic displays

Seven experiments were conducted to replicate, and extend, a finding by Tipper, Driver, and Weaver (1991). They reported evidence for dynamic, object-centered inhibition of return (IOR)—that is, coding of inhibition following a peripheral cue in coordinates that move with the previously cued object, providing a dynamic bias against reattending to that object. The present experiments used a variation of Posner and Cohen’s (1984) spatial cuing paradigm. Subjects responded manually (simple reaction time) to a luminance increment in one of two peripheral boxes, one of which had previously been cued (brightened). Experiments 1, 2, and 5 replicated the standard (environmental) IOR effect when the display was stationary. IOR was more marked for right-side targets than for left-side targets and tended to be affected by the compatibility between response hand and (cued) target position. However, when the boxes moved around the display center (Experiments 1, 2, 3, 4, 6, and 7), contrary to Tipper et al., there was no evidence of dynamic, object-centered IOR. Rather, there was strong evidence of attentive tracking of whatever box happened to move from left to right, irrespective of the direction of its motion (clockwise or counterclockwise) and whether it was more likely to contain the target than the other (right-to-left moving) box. There was a tendency for left-to-right tracking to be more marked with right-hand responses, pointing to the existence of a dynamic stimulus-response compatibility effect. The implications of the present findings for the role of attentive tracking and IOR in dynamic scenes are discussed.     

Searching for impossible objects: Processing form and attributes in early vision

In five experiments, we investigated the extent to which form (shape) and metric attributes (three-dimensional, 3-D, orientation), both defined by relations between une elements, are processed in early vision. Search for a target defined by an abstract property of form (i.e., impossibility) was slow and serial. In contrast, search for a 3-D orientation target was considerably easier. Subsequent experiments suggest that this difference reflects the fact that 3-D orientation is derivable from localized sets of lines, whereas impossibility is an idiosyncratic property of the complete set of relations between lines. We conclude that only “gross” aspects of form are available in early vision as the complete set of line relations is not processed preattentively. However, localized processing of line relations is sufficient to derive 3-D orientation.     

Attentional localization prior to simpleand directed manual responses

The relationship between attention and the programming of motor responses was investigated, using a paradigm in which the onsets of targets for movements were preceded by peripheral attentional cues. Simple (button release) and reaching manual responses were compared under conditions in which the subjects either made saccades toward the target location or refrained from making eye movements. The timing of the movement onset was used as the dependent measure for both simple and reaching manual responses. Eye movement latencies were also measured. A follow-up experiment measured the effect of the same peripheral cuing procedure on purely visual processes, using signal detection mea-sures of visual sensitivity and response bias. The results of the first experiment showed that reaction time (RT) increased with the distance between the cued and the target locations. Stronger distance ef-fects were observed when goal-directed responses were required, which suggests enhanced attentional localization of target positions under these conditions. The requirement to generate an eye movement response was found to delay simple manual RTs. However, mean reaching RTs were unaffected by the eye movement condition. Distance gradients on eye movement latencies were relatively shallow, as compared with those on goal-directed manual responses. The second experiment showed that the peripheral cue had only a very small effect on visual detection sensitivity in the absence of directed motor responses. It is concluded that cue-target distance effects with peripheral cues are modulated by the motor-programming requirements of the task. The effect of the peripheral cue on eye movement latencies was qualitatively different from that observed on manual RTs, indicating the existence of separate neural representations underlying both response types. At the same time, the interactions be-tween response modalities are consistent with a supramodal representation of attentional space, within which different motor programs may interact.     

Philosophie Als Aufkl?rung

Summary It cannot be stated with certainty that the process of enlightenment (Aufklärung) is irreversible. In many systems the tendency to dogmatize the ideologies by means of which political systems define their identity, invariably dominates the emancipatory tendencies of the intelligentsia. In recent years it has become clear that one has to add to this the fact that in the context of the international student youth movement, part of the intelligentsia is unmistakably fascinated by what dogmatism has been able to achieve as far as integration and orientation are concerned; and thus actively ideological and political movements have been developed which are contrary to the process of enlightening clarification. It is obvious that philosophy plays an important part here.The present essay on the other hand stresses by way of compensation the traditional enlightening function of philosophy. The term enlightening clarification is understood here to mean that process in which the stock of assumptions in regard to reality about which one does not allow for discussion, and which thus, correspondingly, in its claim of validity, is morally and politically controlled and protected group-specifically, is reduced to a minimum. The process of clarification, thus, is a process by means of which our socially secured interestedness, namely that reality is in this way and not in any other way, gradually disintegrates. The institutional character of universally accepted truths as well as the hermeneutic and rhetorical technologies of man's enlightening clarification, whose function it is to dissolve this universal acceptance, are described in this essay in great detail.

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This paper is a reprint from M. Riedel (ed.),Rehabilitierung der praktischen Philosophie. Geschichte — Probleme — Aufgaben. Freiburg: Verlag Rombach & Co., 1972.     

Logical probability,mathematical statistics,and the problem of induction

Summary In this paper I want to discuss some basic problems of inductive logic, i.e. of the attempt to solve the problem of induction by means of a calculus of logical probability. I shall try to throw some light upon these problems by contrasting inductive logic, based on logical probability, and working with undefined samples of observations, with mathematical statistics, based on statistical probability, and working with representative random samples.     

The problem of language and thought in schizophrenia: A review

A slightly different version of this article will also appear as a chapter in H. J. Vetter & R. W. Rieber, (Eds.) (in press).The psychopathology of language and thought. New York: Plenum Press.