Filial imprinting and associative learning

Evidence is reviewed that is relevant to an interpretation of filial imprinting as a form of classical or Pavlovian conditioning. For such an interpretation it has to be assumed that the imprinting object provides both the unconditioned stimulus (UCS) and the conditioned stimulus (CS). The difficulty for an experimental approach is that CS and UCS are always presented simultaneously and cannot be manipulated independently, making it virtually impossible to test phenomena such as latent inhibition and extinction. Existing evidence is consistent with a conditioning theory of imprinting, for instance with regard to the reversibility of filial preferences. Some hitherto unexplained findings can be accounted for in terms of overshadowing and blocking. Results of an experiment are discussed in which the occurrence of blocking was explicitly tested. The findings support an associative learning interpretation of imprinting, but further experiments are needed to be able to rule cut alternative explanations.     

Exposure to physical movements in low back pain patients: restricted effects of generalization.

Whether the effects of exposure to 1 movement generalize to another dissimilar movement was investigated in 37 patients with low back pain (15 men, 22 women). Two movements were executed twice: bending forward while standing and lifting 1 leg while lying down. During each trial, baseline pain, expected pain, and experienced pain were recorded. Similar ratings for perceived harm were obtained. Analyses revealed an initial over prediction of pain, but after exposure the overprediction was readily corrected. This exposure effect did not generalize toward another dissimilar movement. These results were only characteristic for patients with catastrophic thinking about pain. Low pain catastrophizers did not overpredict pain. There were no effects of exposure on perceived harm. Exposure may profitably be conceived of as the learning of exceptions to a general rule.     

Faster forgetting contributes to impaired spatial memory in the PDAPP mouse: Deficit in memory retrieval associated with increased sensitivity to interference?

Two experiments were conducted to investigate the possibility of faster forgetting by PDAPP mice (a well-established model of Alzheimer's disease as reported by Games and colleagues in an earlier paper). Experiment 1, using mice aged 13-16 mo, confirmed the presence of a deficit in a spatial reference memory task in the water maze by hemizygous PDAPP mice relative to littermate controls. However, after overtraining to a criterion of equivalent navigational performance, a series of memory retention tests revealed faster forgetting in the PDAPP group. Very limited retraining was sufficient to reinstate good memory in both groups, indicating that their faster forgetting may be due to retrieval failure rather than trace decay. In Experiment 2, 6-mo-old PDAPP and controls were required to learn each of a series of spatial locations to criterion with their memory assessed 10 min after learning each location. No memory deficit was apparent in the PDAPP mice initially, but a deficit built up through the series of locations suggestive of increased sensitivity to interference. Faster forgetting and increased interference may each reflect a difficulty in accessing memory traces. This interpretation of one aspect of the cognitive deficit in human mutant APP mice has parallels to deficits observed in patients with Alzheimer's disease, further supporting the validity of transgenic models of the disease.     

Contour-based object identification and segmentation: stimuli, norms and data, and software tools.

We summarize five studies of our large-scale research program, in which we examined aspects of contour-based object identification and segmentation, and we report on the stimuli we used, the norms and data we collected, and the software tools we developed. The stimuli were outlines derived from the standard set of line drawings of everyday objects by Snodgrass and Vanderwart (1980). We used contour curvature as a major variable in all the studies. The total number of 1,500 participants produced very solid, normative identification rates of silhouettes and contours, straight-line versions, and fragmented versions, and quite reliable benchmark data about saliency of points and object segmentation into parts. We also developed several software tools to generate stimuli and to analyze the data in nonstandard ways. Our stimuli, norms and data, and software tools have great potential for further exploration of factors influencing contour-based object identification, and are also useful for researchers in many different disciplines (including computer vision) on a wide variety of research topics (e.g., priming, agnosia, perceptual organization, and picture naming). The full set of norms, data, and stimuli may be downloaded from www.psychonomic.org/archive/.     

What is “marked” in visual marking? evidence for effects of configuration in preview search

Visual search for a conjunction target is facilitated when distractor sets are segmented over time: the preview benefit. Watson and Humphreys (1997) suggested that this benefit involved inhibition of old items (visual marking, VM). We investigated whether the preview benefit is sensitive to the configuration of the old distractors. Old distractors changed their location prior to the occurrence of the new items, while also either changing or maintaining their configuration. Configuration changes disrupted search. The results are consistent with object-based VM, which is sensitive to the configuration of old stimuli.     

Freedom – the abyssal ground of Freudian psychoanalysis

Freedom is an a priori condition for the way in which Freudian psychoanalysis thematizes the development, the structure and the dynamics of our psychic life; the human psyche is essentially constituted by freedom. What this really means is that psychoanalysis lacks a foundation or ground – both as a psychological science and as a kind of clinical treatment. Freedom is the abyssal ground of psychoanalysis.     

The Genealogy of “Empirical Post-structuralist” STS,Retold in Two Conjunctures: The Legacy of Hegel and Althusser

Recent discussions in science and technology studies (STS) about the risks of science and technology have led to political economy occupying centre stage. Closely related to political economy as a field of investigation are a number of overarching concepts, such as class, capitalism and interest. However, reliance on such concepts is rejected in post-Actor Network Theory STS. This stand-off over overarching categories can be traced back to two conjuntures in the genealogy of STS. First, the influence of Hegel and his concept of “totality”; and second, the influence from anti-hegelian French epistemology with its celebration of the opposite concept, that of “multiplicity”.     

Does activating justice help or hurt in promoting forgiveness?

Do justice values promote or obstruct forgiveness? This question has received virtually no empirical attention, even though past theorizing suggest two different answers. The literature on forgiveness suggests that justice constitutes a barrier to forgiveness, suggesting that the activation of justice values should decrease the probability of forgiveness. Conversely, the literature on justice and human values indicates that justice and forgiveness are positively associated, suggesting that the activation of justice should enhance the probability of forgiveness. Consistent with the latter line of reasoning, three studies, using complementary priming methods, provide converging evidence for the prediction that the activation of justice promotes (rather than obstructs) forgiveness. Implications for extant theory regarding forgiveness and justice are discussed.