The demise of short-term memory revisited: empirical and computational investigations of recency effects

In the single-store model of memory, the enhanced recall for the last items in a free-recall task (i.e., the recency effect) is understood to reflect a general property of memory rather than a separate short-term store. This interpretation is supported by the finding of a long-term recency effect under conditions that eliminate the contribution from the short-term store. In this article, evidence is reviewed showing that recency effects in the short and long terms have different properties, and it is suggested that 2 memory components are needed to account for the recency effects: an episodic contextual system with changing context and an activation-based short-term memory buffer that drives the encoding of item-context associations. A neurocomputational model based on these 2 components is shown to account for previously observed dissociations and to make novel predictions, which are confirmed in a set of experiments.     

Agency, authorship, and illusion

Daniel Wegner argues that conscious will is an illusion. I examine the adequacy of his theory of apparent mental causation and whether, if accurate, it suggests that our experience of agency and authorship should be considered illusory. I examine various interpretations of this claim and raise problems for each interpretation. I also distinguish between the experiences of agency and authorship.     

Do not prime hawks with doves: the interplay of construct activation and consistency of social value orientation on cooperative behavior

Low and high consistent pro-socials and pro-selfs were primed with neutral, morality, or might concepts in mixed-motive situations. The authors expected participants' social value orientation to influence cooperative behavior among (a) high consistent individuals in all prime conditions and (b) low consistent individuals in the neutral prime condition only. The authors also expected the primes to influence cooperative behavior more among low than high consistent individuals. Four experiments using supra-liminal (Experiments 1, 2, and 4) or subliminal (Experiment 3) priming and 2-person (Experiments 1-3) or N-person (Experiment 4) social dilemmas partially supported these initial predictions. One intriguing exception was that morality primes reduced cooperation among high consistent pro-selfs. Experiments 2-4 allowed testing for the potential role of expectations in shaping participants' cooperative behavior.     

Human understanding

Contemporary thinkers either hold that meanings cannot be mental states, or that they are patterns of brain functions. But patterns of social, or brain, interactions cannot be that which we understand. Wittgenstein had another answer (not the one attributed to him by writers who ignore his work in psychology): understanding, he said, is seeing an item as embodying a type Q, thus constraining what items will be seen as the same. Those who cannot see things under an aspect are meaning-blind.That idea is expanded in this article. Its ontology consists of types only: entities that recur in space, time, and possible worlds. Types (Socrates, Man, Red, On, etc.) overlap; Socrates = Bald at some index and not in another. The logic used is thus that of contingent identity. Now some possible worlds are mentally represented; the entities that occur in them are meanings. But such entities may also recur in the real world. Thus the entities we experience, the phenomena, which serve as our meanings, may be identical in the real world with real things. A correspondence theory of truth is thus developed: a sentence is true iff its meaning constitutes, in a specified way, a real situation.     

A comparison of single-subject and traditional statistical designs in steady-state evoked potential research

An experiment was conducted to assess the relationship between level of auditory noise and a measure derived from the steady-state evoked potential (SSEP) called relative transmission time (RTF). The visual stimulus consisted of a 150-fL light that was modulated at 45, 48, or 51 Hz to a depth of 30%. The auditory stimulus was bandpass-limited white noise at 65, 75, or 85 dB, The outcomes of single-subject and group statistical analyses were compared. Neither statistic indicated a significant effect for cross-modal white noise on the SSEP. Whereas the more traditional group approach indicated only large between-subject variability, the single-subject approach clearly indicated deviant data of one of the subjects.     

ACQUISITION OF SIGN LANGUAGE BY AUTISTIC CHILDREN. I: EXPRESSIVE LABELLING

There has been growing interest in teaching sign language to autistic children who have failed to develop speech. However, controlled experimentation in this area is nonexistent. In the present study, four nonverbal autistic children were taught expressive sign labels for common objects, using a training procedure that consisted of prompting, fading, and stimulus rotation. The efficacy of the procedure was demonstrated in a multiple-baseline design across objects. The results were reliable, replicable across children, and generalizable across therapists. A stimulus control analysis demonstrated that, for three of the children, correct signing was controlled solely by the visual cues associated with the presentation of a given object and was independent of the auditory cues related to the same object. These latter results are discussed with respect to the known perceptual and linguistic deficits of autistic children.