Supplemental Material for Reading Through the Life Span: Individual Differences in Psycholinguistic Effects

2019 ◽  
Author(s):  
John D. Lewis ◽  
Gleb Bezgin ◽  
Vladimir S. Fonov ◽  
D. Louis Collins ◽  
Alan C. Evans

AbstractBoth the cortex and the subcortical structures are organized into a large number of distinct areas reflecting functional and cytoarchitectonic differences. Mapping these areas is of fundamental importance to neuroscience. A central obstacle to this task is the inaccuracy associated with mapping results from individuals into a common space. The vast individual differences in morphology pose a serious problem for volumetric registration. Surface-based approaches fare substantially better, but have thus far been used only for cortical parcellation. We extend this surface-based approach to include also the subcortical deep gray-matter structures. Using the life-span data from the Enhanced Nathan Klein Institute - Rockland Sample, comprised of data from 590 individuals from 6 to 85 years of age, we generate a functional parcellation of both the cortical and subcortical surfaces. To assess this extended parcellation, we show that our extended functional parcellation provides greater homogeneity of functional connectivity patterns than do arbitrary parcellations matching in the number and size of parcels. We also show that our subcortical parcels align with known subnuclei. Further, we show that this parcellation is appropriate for use with data from other modalities; we generate cortical and subcortical white/gray contrast measures for this same dataset, and draw on the fact that areal differences are evident in the relation of white/gray contrast to age, to sex, to brain volume, and to interactions of these terms; we show that our extended functional parcellation provides an improved fit to the complexity of the life-span changes in the white/gray contrast data compared to arbitrary parcellations matching in the number and size of parcels. We provide our extended functional parcellation for the use of the neuroimaging community.


1989 ◽  
Vol 44 (4) ◽  
pp. P100-P105 ◽  
Author(s):  
N. L. Pedersen ◽  
M. Gatz ◽  
R. Plomin ◽  
J. R. Nesselroade ◽  
G. E. McClearn

2015 ◽  
Vol 24 (2) ◽  
pp. 204-215 ◽  
Author(s):  
Christina M. Roup ◽  
Elizabeth D. Leigh

PurposeThe purpose of the present study was to examine individual differences in binaural processing across the adult life span.MethodSixty listeners (aged 23–80 years) with symmetrical hearing were tested. Binaural behavioral processing was measured by the Words-in-Noise Test, the 500-Hz masking level difference, and the Dichotic Digit Test. Electrophysiologic responses were assessed by the auditory middle latency response binaural interaction component.ResultsNo correlations among binaural measures were found. Age accounted for the greatest amount of variability in speech-in-noise performance. Age was significantly correlated with the Words-in-Noise Test binaural advantage and dichotic ear advantage. Partial correlations, however, revealed that this was an effect of hearing status rather than age per se. Inspection of individual results revealed that 20% of listeners demonstrated reduced binaural performance for at least 2 of the binaural measures.ConclusionsThe lack of significant correlations among variables suggests that each is an important measurement of binaural abilities. For some listeners, binaural processing was abnormal, reflecting a binaural processing deficit not identified by monaural audiologic tests. The inclusion of a binaural test battery in the audiologic evaluation is supported given that these listeners may benefit from alternative forms of audiologic rehabilitation.


Author(s):  
Spencer Christopher

In this chapter, I sketch an integrated account of environmental assessment, cognition, and action throughout the individual’s life span. Zimring and Gross (this volume) have already described how the schema is structured to include all three aspects; Canter (this volume) has extended this to stress the social context of meanings and actions in which these schema operate; and this chapter accepts and develops their positions. What further can a life-span approach add to the arguments advanced in these earlier integrative chapters? Liben (this volume) has already stated the case most powerfully with respect to her topic, environmental cognition; and it can as easily be applied to evaluation and action. A life-span approach enables development to be put in context: what earlier stages have so far equipped the individual to do, what the demands of the current situation are on the individual, and how variations at the present stage can affect later development. Taking this developmental perspective throws the emphasis on process and on the adaptive nature of the environmental schema for the particular life stage reached by the individual. As such, the perspective provides a test bed for examining the range of theoretical relationships between affect, cognition, and action in the environment advanced in earlier chapters. The life-span approach can also serve to reintroduce into the field a sense of the importance of individual differences, and continuities of individuality through life, which is conspicuously missing from many of the earlier chapters. The developmental tradition within psychology has not, as a whole, stressed individual differences as much as has done the life-span developmental. The life-span perspective has been much concerned with continuities and developments within the individual, as goals and tasks change over the life course. Much mainstream “developmental” research lacks this sense of continuity, being often presented as a series of snapshots of the typical child at different ages or stages. In contrast, the life-span approach, as Liben’s chapter reminds us, emphasizes the processes whereby developments occur, and conceptualizes this development as affected by biological changes, psychological development, changes in the individual’s social role and context, cultural forces, and historical changes during the individual’s life span.


Sign in / Sign up

Export Citation Format

Share Document