Cue-based preparation and stimulus-based priming of tasks in task switching

In this study, we investigated the interaction of three different sources of task activation in precued task switching. We distinguished (1) intentional, cue-based task activation from two other, involuntary sources of activation: (2) persisting activation from the preceding task and (3) stimulus-based task activation elicited by the task stimulus itself. We assumed that cue-based task activation increases as a function of cue-stimulus interval (CSI) and that task activation from the preceding trial decays as a function of response-stimulus interval Stimulus-based task activation is thought to be due to involuntary retrieval of stimulus-associated tasks. We manipulated stimulus-based task activation by mapping each of the stimuli consistently to only one or the other of the two tasks. After practice, we reversed this mapping in order to test the effects of item-specific stimulus-task association. The mapping reversal resulted in increased reaction times and increased task shift costs. These stimulus-based priming effects were markedly reduced with a long CSI, relative to a short CSI, suggesting that stimulus-based priming shows up in performance principally when competition between tasks is high and that cue-based task activation reduces task competition. In contrast, lengthening the response-cue interval (decay time) reduced shift costs but did not reduce the stimulus-based priming effect The data are consistent with separable stimulus-related and response-related components of task activation. Further theoretical implications of these findings are discussed.     

Effects of precuing horizontal and vertical dimensions on right—left prevalence

When stimuli and responses can be coded along horizontal and vertical dimensions simultaneously, a right-left prevalence effect is often obtained for which the advantage for a compatible mapping is larger on the horizontal dimension than on the vertical dimension. The present study investigated the role of preparatory processes in this right-left prevalence effect using a method in which the relevant dimension was cued at short and long intervals prior to presentation of the target stimulus. In three experiments, the right-left prevalence effect did not vary significantly in magnitude as a function of cue-target interval, suggesting that the effect is due primarily to relative salience of the horizontal and vertical codes, as determined by the task structure, and not to a greater ease of attending to the horizontal dimension.     

Self-monitoring,need for cognition,and the Stroop effect: a preliminary study

The color-word Stroop task requires an individual to ignore one piece of information (word) while responding to another (color). Since self-monitors are good at adapting their responses to fit a situation and those high in need for cognition carefully think through information before responding, this study explored the relationship between self-monitoring and need for cognition using Stroop interference. It was anticipated that self-monitoring would reduce Stroop interference, while need for cognition would increase Stroop interference. 23 General Psychology students (10 men, 13 women, M(age) = 18.8 yr.) participated. Participants were given the Self-monitoring Scale, the Need for Cognition Scale, and the Stroop Color-Word Test. Analysis indicated that Need for Cognition was not correlated with Stroop interference (r = .31) but higher scores on Self-monitoring were correlated with lower Stroop interference (r = .43). Implications for research are suggested.     

Disability or end-of-life? Competing narratives in bioethics

Bioethics, and indeed much ethicalwriting generally, makes its point throughnarratives. The religious parable no less thanthe medical teaching case uses a simple storyto describe appropriate action or theapplication of a critical principle. Whilepowerful, the telling story has limits. In thispaper the authors describe a simple teachingcase on ``end-of-life' decision making that wasill received by its audience. The authors ill-receivedexample, involving the disconnection ofventilation in a patient with ALS (Lou Gherig'sDisease) was critiqued by audience members withlong-term experience as ventilation users. Inthis case, the supposedly simple narrative ofthe presenters conflicted with the lifehistories of the audience. The lessons of thisstory, and the conflict that resulted, speakcritically to the limits of simple teachingcases as well as the strengths of narrativeanalysis as a tool for the exploration ofbioethical case histories. This revised version was published online in June 2006 with corrections to the Cover Date.     

Object-recognition tasks: comparing paper versions to computerized laboratory methods

This study attempts to generalize Biederman's 1987 findings regarding Recognition by Components theory, which were obtained using a computer administered object-recognition task, to an analog or paper task that is consistent with typical assessment or testing procedures. Three versions of an object-recognition task were developed after the Structure of Intellect-Learning Abilities Test by Meeker, Meeker, and Roid. One version contained randomly fragmented objects, one contained objects with vertices present, and the third contained objects with midsegments. 30 participants were administered each of the three versions in a counterbalanced order. The results are consistent with those of Biederman. Objects with missing vertices were more difficult to recognize than objects with missing midsegments. There was no difference between randomly fragmented objects and those with vertices present. Implications for object-recognition research and test-item development are discussed. In particular, it is suggested that perceptual theories should be used in developing test items to gain greater control in creating items of appropriate difficulty and to increase the validity of the overall instrument.     

The impact of response mode on implicit and explicit sequence learning

Evidence regarding the influence of response mode on sequence learning in serial reaction time (SRT) tasks has been mixed so far. In the present study, sequence learning was investigated under two different response conditions: manual (button presses) versus verbal (pronunciation of digits). Additionally, participants were divided post hoc into subgroups differing in their degree of explicit knowledge about the sequence. Results showed an interaction between response mode and type of learning (implicit vs. explicit), with explicit learning functioning more effectively under verbal than under manual conditions, whereas implicit learning was unaffected by the variation of the response mode. Implications concerning different underlying learning mechanisms (R-R learning vs. R-S learning) are discussed. Specifically, we suggest that the high response-effect distinctiveness of the verbal responses facilitated R-R learning.     

Blockade of NMDA receptors in the amygdala prevents latent inhibition of fear-conditioning

The association between a conditioned stimulus (CS) and an unconditioned stimulus (US) in fear-conditioning depends on N-methyl-D-aspartate (NMDA) receptors in the basolateral amygdala complex (BLA). Latent inhibition (LI) is the retardation in learning due to nonreinforced presentation of the prospective CS before conditioning. Disruption of LI in rats is an animal model of schizophrenia, reflecting the deficits of schizophrenic patients in neglecting irrelevant information. We investigated whether the BLA is involved in LI of fear-potentiated startle. Infusions of the NMDA receptor antagonist D,L-2-amino-5-phosphonopentanoic acid (AP-5; 12.5 nmoles) into the BLA before preexposure of rats to the neutral stimulus prevent LI of fear-conditioning. We also demonstrated by the same method that a complex of thalamic nuclei, comprising the medial part of the medial geniculate nucleus, the posterior intralaminar nucleus, and the suprageniculate nucleus, is involved in fear-conditioning, but not in LI. This suggests that the presentation of an innocuous stimulus during preexposure leads to an NMDA receptor-dependent change of neurotransmission in the BLA, but not in the thalamus. Our data show that the BLA but not the thalamus regulates in LI of fear-potentiated startle. Furthermore, it supports the hypothesis that the inability of schizophrenic patients to ignore irrelevant stimuli may be caused by hypofunction of the glutamatergic transmission in the brain and suggests an involvement of the amygdala in the neuropathology of schizophrenia.     

Competitive Charity: A Neoliberal Culture of ‘Giving Back’ in Global Yoga

Recent developments in global yoga show a tendency towards social activism in the charity market. As part of this, Yoga Aid World Challenge 2012 (founded in 2007) is a good example of how neoliberal organisational culture and generosity may become entangled. Competition stands out as an unusual strategy in the predominantly gentle type of modern postural yoga. During this 24-hour event, yoga is practised across 25 countries worldwide, following the course of the sun. Corresponding social networks and digital media strongly promote, months before the event, the joy of practising yoga and equate the meaning of life with giving. This is interpreted with findings from behavioural economics on altruism and from new institutional economics on the organisers’ communication and event marketing. This article paints a picture of hybrid social network formation and a cluster of affects, including competition, gratitude, and a sense of obligation.     

Semantic effects on sensory-motor modality switching

Language processing always involves a combination of sensory (auditory or visual) and motor modalities (vocal or manual). In line with embodied cognition theories, we additionally assume a semantically implied modality (SIM) due to modality references of the underlying concept. Understanding ear-related words (e.g. “noise”), for example, should activate the auditory SIM. In the present study, we investigated the influence of the SIM on sensory-motor modality switching (e.g. switching between the auditory-vocal and visual-manual combination). During modality switching, participants categorised words with regard to their SIM (e.g. ear- versus eye-related words). Overall performance was improved and switch costs were reduced whenever there was concordance between SIMs and sensory-motor modalities (e.g. an auditory presentation of ear-related words). Thus, the present study provides first evidence for semantic effects during sensory-motor modality switching in terms of facilitation effects whenever the SIM was in concordance with sensory-motor modalities.     

A review of ideomotor approaches to perception,cognition, action,and language: advancing a cultural recycling hypothesis

The term “cultural recycling” derives from the neuronal recycling hypothesis, which suggests that representations of cultural inventions like written words, Arabic numbers, or tools can occupy brain areas dedicated to other functions. In the present selective review article, we propose a recycling hypothesis for the ideomotor mechanism. The ideomotor approach assumes that motor actions are controlled by the anticipation of the expected perceptual consequences that they aim to generate in the environment. Arguably, such action–perception mechanisms contribute to motor behaviour for human and non-human animals since millions of years. However, recent empirical studies suggest that the ideomotor mechanism can also contribute to word processing, number representation, and arithmetic. For instance, it has been shown that the anticipatory simulation of abstract semantics, like the numerical quantitative value of three items can prime processing of the associated Arabic number “3”. Arabic numbers, words, or tools represent cultural inventions, so that, from a theoretical perspective, we suggest an ideomotor recycling hypothesis for the interaction with such artefacts. In this view, the ideomotor mechanism spreads its influence to other functions beyond motor control, and is recycled to flexibly adapt different human behaviours towards dealing with more abstract concepts.