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      The development of peak alpha frequency from infancy to adolescence and its role in visual temporal processing: A meta-analysis

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          Abstract

          While it has been shown that alpha frequency increases over development ( Stroganova et al., 1999), a precise trajectory has not yet been specified, making it challenging to constrain theories linking alpha rhythms to perceptual development. We conducted a comprehensive review of studies measuring resting-state occipital peak alpha frequency (PAF, the frequency exhibiting maximum power) from birth to 18 years of age. From 889 potentially relevant studies, we identified 40 reporting PAF (109 samples; 3882 subjects). A nonlinear regression revealed that PAF increases quickly in early childhood (from 6.1 Hz at 6 months to 8.4 Hz at 5 years) and levels off in adolescence (9.7 Hz at 13 years), with an asymptote at 10.1 Hz. We found no effect of resting state procedure (eyes-open versus eyes-closed) or biological sex. PAF has been implicated as a clock on visual temporal processing, with faster frequencies associated with higher visual temporal resolution. Psychophysical studies have shown that temporal resolution reaches adult levels by 5 years of age ( Freschl et al., 2019, Freschl et al., 2020). The fact that PAF reaches the adult range of 8–12 Hz by that age strengthens the link between PAF and temporal resolution.

          Highlights

          • Determined the developmental trajectory of Peak Alpha Frequency (PAF).

          • PAF increases from 6 Hz in early infancy and asymptotes at 10 Hz by adolescence.

          • PAF increase is consistent with the age-related increase in visual temporal resolution.

          • No effect of resting state EEG methodology (eyes-closed vs. eyes-open) or sex on PAF.

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          Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement.

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            The weirdest people in the world?

            Behavioral scientists routinely publish broad claims about human psychology and behavior in the world's top journals based on samples drawn entirely from Western, Educated, Industrialized, Rich, and Democratic (WEIRD) societies. Researchers - often implicitly - assume that either there is little variation across human populations, or that these "standard subjects" are as representative of the species as any other population. Are these assumptions justified? Here, our review of the comparative database from across the behavioral sciences suggests both that there is substantial variability in experimental results across populations and that WEIRD subjects are particularly unusual compared with the rest of the species - frequent outliers. The domains reviewed include visual perception, fairness, cooperation, spatial reasoning, categorization and inferential induction, moral reasoning, reasoning styles, self-concepts and related motivations, and the heritability of IQ. The findings suggest that members of WEIRD societies, including young children, are among the least representative populations one could find for generalizing about humans. Many of these findings involve domains that are associated with fundamental aspects of psychology, motivation, and behavior - hence, there are no obvious a priori grounds for claiming that a particular behavioral phenomenon is universal based on sampling from a single subpopulation. Overall, these empirical patterns suggests that we need to be less cavalier in addressing questions of human nature on the basis of data drawn from this particularly thin, and rather unusual, slice of humanity. We close by proposing ways to structurally re-organize the behavioral sciences to best tackle these challenges.
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              EEG alpha and theta oscillations reflect cognitive and memory performance: a review and analysis.

              Evidence is presented that EEG oscillations in the alpha and theta band reflect cognitive and memory performance in particular. Good performance is related to two types of EEG phenomena (i) a tonic increase in alpha but a decrease in theta power, and (ii) a large phasic (event-related) decrease in alpha but increase in theta, depending on the type of memory demands. Because alpha frequency shows large interindividual differences which are related to age and memory performance, this double dissociation between alpha vs. theta and tonic vs. phasic changes can be observed only if fixed frequency bands are abandoned. It is suggested to adjust the frequency windows of alpha and theta for each subject by using individual alpha frequency as an anchor point. Based on this procedure, a consistent interpretation of a variety of findings is made possible. As an example, in a similar way as brain volume does, upper alpha power increases (but theta power decreases) from early childhood to adulthood, whereas the opposite holds true for the late part of the lifespan. Alpha power is lowered and theta power enhanced in subjects with a variety of different neurological disorders. Furthermore, after sustained wakefulness and during the transition from waking to sleeping when the ability to respond to external stimuli ceases, upper alpha power decreases, whereas theta increases. Event-related changes indicate that the extent of upper alpha desynchronization is positively correlated with (semantic) long-term memory performance, whereas theta synchronization is positively correlated with the ability to encode new information. The reviewed findings are interpreted on the basis of brain oscillations. It is suggested that the encoding of new information is reflected by theta oscillations in hippocampo-cortical feedback loops, whereas search and retrieval processes in (semantic) long-term memory are reflected by upper alpha oscillations in thalamo-cortical feedback loops. Copyright 1999 Elsevier Science B.V.
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                Author and article information

                Contributors
                Journal
                Dev Cogn Neurosci
                Dev Cogn Neurosci
                Developmental Cognitive Neuroscience
                Elsevier
                1878-9293
                1878-9307
                09 August 2022
                October 2022
                09 August 2022
                : 57
                : 101146
                Affiliations
                [a ]University of Massachusetts Boston, Boston, MA, USA
                [b ]Smith-Kettlewell Eye Research Institute, San Francisco, CA, USA
                Author notes
                [* ]Correspondence to: 2318 Fillmore St., San Francisco, CA 94115, USA. jfreschl@ 123456ski.org
                Article
                S1878-9293(22)00089-5 101146
                10.1016/j.dcn.2022.101146
                9399966
                35973361
                fb9c4119-d34c-437c-85e6-5ba24bb1e352
                © 2022 The Authors

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                : 11 April 2022
                : 21 July 2022
                : 8 August 2022
                Categories
                Review

                Neurosciences
                peak alpha frequency,alpha rhythm,visual temporal processing,development,children
                Neurosciences
                peak alpha frequency, alpha rhythm, visual temporal processing, development, children

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