Visuo-spatial representations of the alphabet in synaesthetes and non-synaesthetes

Visuo-spatial representations of the alphabet (so-called 'alphabet forms') may be as common as other types of sequence-space synaesthesia, but little is known about them or the way they relate to implicit spatial associations in the general population. In the first study, we describe the characteristics of a large sample of alphabet forms visualized by synaesthetes. They most often run from left to right and have salient features (e.g., bends, breaks) at particular points in the sequence that correspond to chunks in the 'Alphabet Song' and at the alphabet mid-point. The Alphabet Song chunking suggests that the visuo-spatial characteristics are derived, at least in part, from those of the verbal sequence learned earlier in life. However, these synaesthetes are no faster at locating points in the sequence (e.g., what comes before/after letter X?) than controls. They tend to be more spatially consistent (measured by eye tracking) and letters can act as attentional cues to left/right space in synaesthetes with alphabet forms (measured by saccades), but not in non-synaesthetes. This attentional cueing suggests dissociation between numbers (which reliably act as attentional cues in synaesthetes and non-synaesthetes) and letters (which act as attentional cues in synaesthetes only).     

Effects of changes in narrative time on eye movements and recognition responses

Abstract

Gibbs and O'Brien (1990) recently claimed that the images that people associate with everyday idioms reflect the deep conceptual metaphors that underlie the meanings of those idioms. However, because idiomatic strings can convey both a literal and an idiomatic meaning, people must be able to inhibit or ignore literal meanings if they are to produce mental images that uniquely reflect idiomatic meanings. We investigated the potential interference between literal and idiomatic meanings in three experiments. Experiment 1 used a mental-image production task similar to that used by Gibbs and O'Brien. Counter to Gibbs and O'Brien's claim, the images that we obtained referred overwhelmingly to the literal meanings of idiomatic strings rather than to their idiomatic meanings. Experiments 2 and 3 employed a paraphrase verification task to examine the effects of mental imagery on idiom comprehension. If the images associated with an idiom reflect that idiom's meaning, then imagery should facilitate comprehension. No evidence for facilitation was found in either experiment. Instead, imagery interfered with comprehension, as assessed by paraphrase verification time, both for idiomatic meanings and for literal, concrete meanings. We conclude that the images associated with idioms do not reflect idiom meanings.     

Psychological adaptation of adolescents with immigrant backgrounds

In the present study, the author examined 3 theoretical perspectives--family values, acculturation strategies, and social group identity--as predictors of the psychological well-being of adolescents from immigrant backgrounds. The 3 perspectives share the view that immigrants' successful adaptation involves the balancing of their heritage culture and the culture of the society of settlement. The participants were 506 adolescents from 4 backgrounds--Vietnamese, Pakistani, Turkish, and Chilean--who were living in Norway. The 3 theoretical perspectives together accounted for between 12% and 22% of the explained variance of mental health, life satisfaction, and self-esteem. The predictive powers of the different perspectives, however, were dependent on which outcome was predicted. On the whole, social group identity showed the strongest predictive power.     

Interactive property attribution in concept combination

We address the question of how people understand attributive noun-noun compounds. Alignment-and-comparison models suggest that the similarity of the constituent concepts guides interpretation. We propose, as an alternative, an interactive property attribution model wherein the modifier and head concepts have different functions: The head provides relevant dimensions, whereas the modifier provides candidate features for attribution. According to our model, the interaction of dimensions and features, rather than constituent similarity, guides interpretation. In this study, we empirically contrasted the two models by holding constituent similarity of compounds constant while varying the interaction of modifier feature salience and head dimension relevance. Compounds consisting of a head concept with a relevant dimension for attribution and a modifier with a salient property on that dimension were interpreted by means of property attribution. Other compounds with equivalent constituent similarity, but lacking the high salience-relevance interaction, were not interpreted by means of attribution. The interactive property attribution model more accurately predicted interpretation of noun-noun compounds.     

Cognitive functioning after medial frontal lobe damage including the anterior cingulate cortex: a preliminary investigation

Two patients with medial frontal lobe damage involving the anterior cingulate cortex (ACC) performed a range of cognitive tasks, including tests of executive function and anterior attention. Both patients lesions extended beyond the ACC, therefore caution needs to be exerted in ascribing observed deficits to the ACC alone. Patient performance was compared with age and education matched healthy controls. Both patients showed intact intellectual, memory, and language abilities. No clear-cut abnormalities were noted in visuoperceptual functions. Speed of information processing was mildly reduced only in Patient 2 (bilateral ACC lesion). The patients demonstrated weak or impaired performance only on selective executive function tests. Performance on anterior attention tasks was satisfactory. We tentatively suggest that our findings are inconsistent with anterior attention theories of ACC function based on neuroimaging findings. We propose that the data may imply that the ACC does not have a central role in cognition. We speculate that our findings may be compatible with the view that the ACC integrates cognitive processing with autonomic functioning to guide behaviour.     

Neural synchrony in stochastic resonance, attention, and consciousness.

We describe briefly three of our lab's ongoing projects studying the role of neural synchrony in human perception and cognition. These projects arise from two main interests: the role of noise both in human perception and in neural synchrony, and neural synchrony as a basis for integration of functional modules in the brain. Our experimental work on these topics began with a study of the possibility that noise-influenced neural synchrony might be responsible for the fact that small amounts of noise added to weak signals can enhance their detectability (stochastic resonance). We are also studying the role of neural synchrony in attention and consciousness in several paradigms. On the basis of our own and related work by others, we conclude that (1) neural synchrony plays an important role in the integration of functional modules in the brain and (2) neural synchrony is profoundly affected and possibly regulated, in part, by the "noisiness" of the brain.     

Stimulus selectivity of figural aftereffects for faces

Viewing a distorted face induces large aftereffects in the appearance of an undistorted face. The authors examined the processes underlying this adaptation by comparing how selective the aftereffects are for different dimensions of the images including size, spatial frequency content, contrast, and color. Face aftereffects had weaker selectivity for changes in the size, contrast, or color of the images and stronger selectivity for changes in contrast polarity or spatial frequency. This pattern could arise if the adaptation is contingent on the perceived similarity of the stimuli as faces. Consistent with this, changing contrast polarity or spatial frequency had larger effects on the perceived identity of a face, and aftereffects were also selective for different individual faces. These results suggest that part of the sensitivity changes underlying the adaptation may arise at visual levels closely associated with the representation of faces.