Spatial-frequency-tuned channels in early infancy: VEP evidence

Suter, Penelope S.; Suter, Steve; Roessler, J.; Parker, Kerrie L.; Armstrong, Colin; Powers, Justina

doi:10.1016/0042-6989(94)90212-7

Cited by 17 publications

(10 citation statements)

References 35 publications

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“…Less is known about cortical adaptation. Pattern selective adaptation can be seen with evoked potentials as early as 3 weeks of age (Suter et al, 1994), but whether it shows developmental changes has not been well documented, and it is difficult to distinguish changes in plasticity from changes in other factors such as stimulus selectivity. In aging, declines in neural tuning linked to decreased inhibition have been associated with senescent changes in some cortical aftereffects (Wilson et al, 2011).…”

Section: Adaptation and Compensationmentioning

confidence: 99%

Visual Adaptation

Webster

2015

Annu. Rev. Vis. Sci.

305

291

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Sensory systems continuously mold themselves to the widely varying contexts in which they must operate. Studies of these adaptations have played a long and central role in vision science. In part this is because the specific adaptations remain a powerful tool for dissecting vision, by exposing the mechanisms that are adapting. That is, “if it adapts, it's there.” Many insights about vision have come from using adaptation in this way, as a method. A second important trend has been the realization that the processes of adaptation are themselves essential to how vision works, and thus are likely to operate at all levels. That is, “if it's there, it adapts.” This has focused interest on the mechanisms of adaptation as the target rather than the probe. Together both approaches have led to an emerging insight of adaptation as a fundamental and ubiquitous coding strategy impacting all aspects of how we see.

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Section: Adaptation and Compensationmentioning

confidence: 99%

Visual Adaptation

Webster

2015

Annu. Rev. Vis. Sci.

305

291

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“…Further, surprisingly few studies have examined how the form and integrity of adaptation processes change across the life span. Factors influencing the development of light adaptation, contrast sensitivity, and contrast gain control have been well characterized in infant vision (Brown & Lindsey, 2009), and pattern-selective adaptation has been demonstrated (e.g., with VEPs) within the first few weeks (Suter et al, 1994). Yet, it is not clear whether there are significant developmental changes in the mechanisms of cortical adaptation.…”

Section: Adaptation and Variations In The Observermentioning

confidence: 99%

Adaptation and visual coding

2011

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Visual coding is a highly dynamic process and continuously adapting to the current viewing context. The perceptual changes that result from adaptation to recently viewed stimuli remain a powerful and popular tool for analyzing sensory mechanisms and plasticity. Over the last decade, the footprints of this adaptation have been tracked to both higher and lower levels of the visual pathway and over a wider range of timescales, revealing that visual processing is much more adaptable than previously thought. This work has also revealed that the pattern of aftereffects is similar across many stimulus dimensions, pointing to common coding principles in which adaptation plays a central role. However, why visual coding adapts has yet to be fully answered.

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“…However, early malnutrition may adversely affect the magnocellular pathway, resulting in losses in the low and mid-low frequencies, but does not affect the parvocellular pathway (i.e., increase in CS with the high frequency). This is possible if one considers that the parvocellular system develops later than the magnocellular system (Wilson, 1988;Norcia, Tyler, & Hamer, 1990;Suter, Suter, Roessler, Parker, Armstrong, & Powers, 1994;Ellemberg, Lewis, Liu, & Maurer, 1999;Adams & Courage, 2002;Benedek, Benedek, Kéri, & Janáky, 2003). During the development of the parvocellular system, children may already be nutritionally recovered.…”

Section: Discussionmentioning

confidence: 99%

Early malnutrition decreases contrast sensitivity to circular concentric gratings.

Alencar¹,

Santos²

2012

Psychology & Neuroscience

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Early malnutrition refers to inadequate nutrition during the critical period of nervous system development followed by nutritional recovery, resulting in a short stature according to age but normal weight according to short stature. We measured the effects of early malnutrition on contrast sensitivity (CS) to concentric circular gratings in 18 children of both sexes, aged 8 to 11 years (mean = 9.2 years, standard deviation = .99 years). Nine of the children were eutrophic (E group), and nine experienced early malnutrition (EM group) based on state healthcare records and Waterlow's anthropometric parameters. Contrast sensitivity to four spatial frequencies (.25, 1.0, 2.0, and 8.0 cycles per degree [cpd]) was measured using a temporal two-alternative forced-choice psychophysical method with mean luminance of 40.1 cd/m 2 . Statistical analyses showed significant differences between groups and a group × frequency interaction. EM group was significantly less sensitive than the E group to the 8.0 cpd frequency and needed 1.49-times more contrast to detect the gratings. These results suggest that early malnutrition impairs CS to high-spatialfrequency concentric circular gratings in children. Therefore, early malnutrition, which is known to affect primary visual cortical areas, may also affect higher visual cortical areas such as V4 and the inferotemporal cortex.

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Spatial-frequency-tuned channels in early infancy: VEP evidence

Cited by 17 publications

References 35 publications

Visual Adaptation

Visual Adaptation

Adaptation and visual coding

Early malnutrition decreases contrast sensitivity to circular concentric gratings.

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