Modulation sensitivity in the perceptual organization of speech

In a spoken utterance, a talker expresses linguistic constituents in serial order. A listener resolves these linguistic properties in the rapidly fading auditory sample. Classic measures agree that auditory integration occurs at a fine temporal grain. In contrast, recent studies have proposed that sensory integration of speech occurs at a coarser grain, approximate to the syllable, on the basis of indirect and relatively insensitive perceptual measures. Evidence from cognitive neuroscience and behavioral primatology has also been adduced to support the claim of sensory integration at the pace of syllables. In the present investigation, we used direct performance measures of integration, applying an acoustic technique to isolate the contribution of short-term acoustic properties to the assay of modulation sensitivity. In corroborating the classic finding of a fine temporal grain of integration, these functional measures can inform theory and speculation in accounts of speech perception.     

Inhibition of return can be associated with object identity but not with object category

In this study, pre-schoolers and a comparison sample of fifth graders and high school students were presented with prediction tasks that varied by content of the base rate information (perceptual vs semantic) either presented alone (simple task) or accompanied by individuating data (complex task). Base rate choices, confidence scores, and explanations of the choices were registered. It is assumed that the presence of content effects in the processing of the base rates is in favour of a mental model account. Results indicated that pre-schoolers are able to build one-dimensional models with perceptual base rates in simple tasks. Fifth graders and high school students are able to build one-dimensional models with both types of content in simple tasks, as well as two-dimensional models in complex tasks. There is a local facilitation effect of semantic contents for fifth graders that disappears for high-school students. Consistency between subjects' choices, confidence scores and rationales depends on the subjects' grade, the number of sources involved, and the base rate content. Developmental trends are discussed in the light of previous research within formal, heuristic, and mental model approaches.     

Invited Address at the Occasion of the Bertelson Award 2005 Impairments in visual discrimination in amnesia: Implications for theories of the role of medial temporal lobe regions in human memory

A prominent and long-standing view of human long-term memory is that structures within the medial temporal lobe (MTL) work together to support the acquisition of memory for facts and events. In contrast to this view, recent studies in rats and non-human primates suggest dissociations in function between regions comprising the MTL. Evidence in support of such specialisation in humans, however, has been inconclusive, leading some researchers to propose that human MTL functions as a unitary system uniquely specialised for the acquisition and storage of long-term memory. This paper reviews some of the key studies from the animal and human literature that support an account of functional differentiation and discusses the different theoretical positions that have emerged from their findings. A series of recent experiments in humans designed to determine whether there is functional homogeneity in MTL regions across species are also reviewed and an alternative account of human memory—in which long-term memory is dependent upon representations distributed throughout the human brain rather than one specialised system—is proposed.     

The Effects of the Structured Interview on Reducing Biases Against Pregnant Job Applicants

Some research has been conducted on the discrimination faced by pregnant women in the workplace. Few studies, however, have specifically investigated how this bias is manifested in employment or hiring decisions. The current study was designed to examine possible bias during structured interviews. Participants watched a videotaped scenario in which candidates were interviewed for a job. The 2 × 2 × 2 experimental conditions were varied to represent a structured or an unstructured interview, a pregnant or nonpregnant interviewee, and the open position of either a high school teacher or sales representative. Results indicate an overall bias against pregnant women and suggested that the structured interview reduces this bias.     

The value tensions in Korean–American mother–child relationships while facilitating academic success

The current study explored mothers’ perspectives concerning their experiences in facilitating the academic success of their adolescents in American schools, using a naturalistic study design, data from transcribed personal interviews of 17 Korean–American mothers, and a phenomenological analysis approach (Giorgi, 1985, 1997). The purposes of this study were to (a) reveal the layers of context that influenced mothers’ thoughts, actions, and mother–child relationships as they assisted their adolescents in realizing academic success, a core value in Korean culture, and (b) uncover the relationship difficulties mothers perceived in these processes. The results indicated that mothers were influenced by their individualistic and collectivist cultural (meta) contexts as they tried to facilitate the academic success for their adolescents. Second, they were struggling with their competing Korean and American value systems (general context) in the adjustment processes of “becoming an American” and “remaining a Korean.” Third, mothers revealed their value tensions with adolescents (specific context) in school and family settings. In the family setting the tensions involved balancing obedience and respect with freedom and equality, similarity preference with diversity tolerance, and achievement and recognition with happiness and fulfillment.     

Similarities and Differences Between African Americans’ and European Americans’ Attitudes,Knowledge, and Willingness to Communicate About Organ Donation1

While little is known about African Americans’ attitudes and knowledge about organ donation, even less is known about how African Americans’ attitudes, values, and beliefs affect their behavior and behavioral intentions regarding organ donation; or how African Americans’ views are similar to or different from those of European Americans. Adults working 2 sites of a national corporation were randomly selected to complete a survey about organ donation willingness, intention to sign an organ donor card, knowledge and attitudes toward organ donation, and level of altruism. Results indicate that African Americans differ significantly from Whites on several individual attitude and knowledge items. However, the basic relationship between knowledge, attitudes, values, and behaviors regarding organ donation between the 2 groups appears the same. Furthermore, these results indicate that future organ donation promotion campaigns must focus on increasing basic knowledge and countering myths about organ donation for both populations.     

The relationship between space and time in the perception of stimuli moving behind a slit

When a shape defined by a set of dots plotted along its contour is presented in a sequence of frames within the boundaries of a slit, and in each frame only one dot (featureless frame) or two dots (feature frame) are displayed, a whole moving dotted shape is perceived. Masking techniques and psychophysical measures have been used to show that a dynamic random-dot mask interferes with shape identification, provided the interframe interval is greater than about 15 ms, and there are no stimulus features for recognition in individual frames. A similar pattern of results was obtained when the observer had only to detect the movement of a single dot or a pair of dots against a dynamic-noise background. It is concluded that the visual system can resolve the correspondence problem in both apparent movement (one moving dot) and aperture viewing (featureless-frame condition) by extracting motion before the extraction of features in each frame. However, the results also show that where feature identification in each frame is possible, it can also be used to identify the moving targets.     

Economic Envy

Envy of others' material possessions is a potent motivator of consumerism. This makes it a prudentially and morally hazardous emotional response. After outlining these hazards, I present an analysis of the emotion of envy. Envy, I argue, presents things in the following way: the envier lacks some good that her rival possesses; this difference between them is bad for the envier; this difference reflects poorly on the envier's worth; and this difference is undeserved. I then discuss the conditions under which these presentations can be satisfied by differences in material possessions. My conclusion is that no difference in material possessions can simultaneously be all the ways envy presents it as being. Consequently, economic envy is systematically irrational: it is never a warranted response to the distribution of material wealth. Recognising this bolsters the prudential and moral case for reducing the degree to which we feel it and for resisting the inclinations it gives rise to when we do.