Age-related differences in visual perception: a PET study

Levine, B; Beason‐Held, Lori L.; Purpura, Keith P.; Aronchick, David M; Optican, Lance M.; Alexander, Gene E.; Horwitz, Barry; Rapoport, Stanley I.; Schapiro, Mark B.

doi:10.1016/s0197-4580(00)00144-5

Cited by 34 publications

(18 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A c c e p t e d M a n u s c r i p t 22 Complex motor tasks require higher activities in cortical and subcortical regions including motor cortex, parietal lobule, thalamus and basal ganglia (Godde and Voelcker-Rehage, 2010) and in frontal and occipital lobule (Lacourse et al, 2005;Malouin et al, 2003;Wai et al, 2012), even more so in older people (Levine et al, 2000). Moreover, older people show an increased activity in the orbifrontal cortex during gait imagery (Allali et al, 2013), which probably indicates that executive functions are restricted or that executive functions try to compensate for other reduced activities to achieve a "normal" locomotor function.…”

Section: Page 22 Of 57mentioning

confidence: 99%

Brain activity during walking: A systematic review

Hamacher

Herold

Wiegel

et al. 2015

Neuroscience & Biobehavioral Reviews

232

202

View full text Add to dashboard Cite

Section: Page 22 Of 57mentioning

confidence: 99%

Brain activity during walking: A systematic review

Hamacher

Herold

Wiegel

et al. 2015

Neuroscience & Biobehavioral Reviews

232

202

View full text Add to dashboard Cite

“…The construction rule is such that each exemplar of an isodipole texture has same spatial frequency spectrum (second-order or ''dipole'' statistics) and is thus indiscriminable to mechanisms that only compute local measures of spatial frequency, orientation, and phase. Isodipole textures activate human striate cortex Levine et al, 2000;Beason-Held, Purpura, Krasuski, Maisog, et al, 1998;Beason-Held, Purpura, Van Meter, et al, 1998;Purpura, Victor, & Katz, 1994), although the activation is stronger over a range of extrastriate visual areas, including both dorsal areas and areas on the ventral surface. Isodipole textures also activate the striate cortex of macaque (Purpura et al, 1994).…”

Section: Introductionmentioning

confidence: 96%

Development of Sensitivity to Texture and Contour Information in the Human Infant

Norcia

Pei

Bonneh

et al. 2005

Journal of Cognitive Neuroscience

View full text Add to dashboard Cite

Texture discrimination and bounding contour extraction are essential parts of the object segmentation and shape discrimination process. As such, successful texture and contour processing are key components underlying the development of the perception of both objects and surfaces. By recording visual-evoked potentials, we investigate whether young infants can detect orientation-defined textures and contours. We measured responses to an organized texture comprised of many Gabor patches of the same orientation, alternated with images containing the same number of patches, but all of random orientation. These responses were compared with a control condition consisting of the alternation between two independently random configurations. Significant difference potentials were found as early as 2-5 months, as were significant odd harmonics in the test conditions. Responses were also measured to Gabor patches organized either as circles (all patches tangent to an imaginary circular path) alternated with pinwheels (all patches having a fixed orientation offset from the path). Infants between 6 and 13 months also showed sensitivity to the global organization of the elements along contours. Differential responses to our texture and contour stimuli and their controls could only have been generated by mechanisms that are capable of comparing the relative orientation of 2 or more patches, as no local information at a single patch distinguished the random and organized textures or the circle and pinwheel configurations.

show abstract

“…It is well known that unisensory ability declines with increasing age and that older adults typically experience increased perceptual thresholds and decreased sensory cortical activity responses [D’Esposito et al, 1999; Johnson et al, 2000; Justino et al, 2001; Levine et al, 2000; Ross et al, 1997]. Studies in the auditory and visual modalities, the most-widely studied sensory domains, have indicated that aging changes occur not only at the level of the sensory organ (e.g., lens changes such as glaucoma and cataracts, loss of hair cells in the cochlea) but also within the neural substrates of the unisensory system.…”

Section: Introductionmentioning

confidence: 99%

Aging and the interaction of sensory cortical function and structure

Peiffer¹,

Hugenschmidt²,

Maldjian³

et al. 2007

Human Brain Mapping

View full text Add to dashboard Cite

Even the healthiest older adults experience changes in cognitive and sensory function. Studies show that older adults have reduced neural responses to sensory information. However, it is well known that sensory systems do not act in isolation but function cooperatively to either enhance or suppress neural responses to individual environmental stimuli. Very little research has been dedicated to understanding how aging affects the interactions between sensory systems, especially cross-modal deactivations or the ability of one sensory system (e.g., audition) to suppress the neural responses in another sensory system cortex (e.g., vision). Such cross-modal interactions have been implicated in attentional shifts between sensory modalities and could account for increased distractibility in older adults. To assess age-related changes in cross-modal deactivations, functional MRI studies were performed in 61 adults between 18 and 80 years old during simple auditory and visual discrimination tasks. Results within visual cortex confirmed previous findings of decreased responses to visual stimuli for older adults. Age-related changes in the visual cortical response to auditory stimuli were, however, much more complex and suggested an alteration with age in the functional interactions between the senses. Ventral visual cortical regions exhibited cross-modal deactivations in younger but not older adults, whereas more dorsal aspects of visual cortex were suppressed in older but not younger adults. These differences in deactivation also remained after adjusting for age-related reductions in brain volume of sensory cortex. Thus, functional differences in cortical activity between older and younger adults cannot solely be accounted for by differences in gray matter volume.

show abstract

Age-related differences in visual perception: a PET study

Cited by 34 publications

References 47 publications

Brain activity during walking: A systematic review

Brain activity during walking: A systematic review

Development of Sensitivity to Texture and Contour Information in the Human Infant

Aging and the interaction of sensory cortical function and structure

Contact Info

Product

Resources

About