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Article

Cognition and Mobility With Aging  

Karen Z. H. Li, Halina Bruce, and Rachel Downey

Research on the interplay of cognition and mobility in old age is inherently multidisciplinary, informed by findings from life span developmental psychology, kinesiology, cognitive neuroscience, and rehabilitation sciences. Early observational work revealed strong connections between sensory and sensorimotor performance with measures of intellectual functioning. Subsequent work has revealed more specific links between measures of cognitive control and gait quality. Convergent evidence for the interdependence of cognition and mobility is seen in patient studies, wherein cognitive impairment is associated with increased frequency and risk of falling. Even in cross-sectional studies involving healthy young and older adults, the effects of aging on postural control and gait are commonly exacerbated when participants perform a motor task with a concurrent cognitive load. This motor-cognitive dual-task method assumes that cognitive and motor domains compete for common capacity, and that older adults recruit more cognitive capacity than young adults to support gait and posture. Neuroimaging techniques such as magnetic resonance imaging (MRI) have revealed associations between measures of mobility (e.g., gait velocity and postural control) and measures of brain health (e.g., gray matter volumes, cortical thickness, white matter integrity, and functional connectivity). The brain regions most often associated with aging and mobility also appear to subserve high-level cognitive functions such as executive control, attention, and working memory (e.g., dorsolateral prefrontal cortex, anterior cingulate). Portable functional neuroimaging has allowed for the examination of neural functioning during real-time walking, often in conjunction with detailed spatiotemporal measures of gait. A more recent strategy that addresses the interdependence of cognitive and motor processes in old age is cognitive remediation. Cognitive training has yielded promising improvements in balance, walking, and overall mobility status in healthy older adults, and those with age-related neurodegenerative conditions such as Parkinson’s Disease.

Article

Time Perception in Development  

Yarden Kedar

Time is an abstract, unobservable, multifaceted, and elusive concept, whose nature has long posited a major challenge in philosophical and scientific thought. Nonetheless, despite the fact that time is not directly perceived by our senses, a universal human experience of time does exist. People are aware of time passing by; seek ways to measure it; arrange their lives around different timelines; and constantly use verbal expressions referring to time. A key question in developmental science is when and how children develop a sense and a concept of time. Infants are equipped from birth with perceptual time-tracking mechanisms for detecting patterns and changes in the physical environment, and their biological clocks reach an adult-like level already at 3 months of age. Infants have been shown to accurately register the recency, duration, frequency, and rhythmic aspects of events. Infants also gradually become more attuned to inter-sensory (visual/auditory/tactile) temporal relations based on co-occurrences of synchrony, duration, rate, and rhythm. These early abilities establish the foundation for the emergence of a metacognitive awareness and conceptualization of time in later stages of development. Several cognitive components such as attention, memory, and language are crucial in producing and maintaining our subjective perception of time. Additional factors include the social and cultural practices of time, which determine our time perspective and time perception. Verbal interactions relating to time between parents and their children aid the child in grasping distinctions between the past, present, and future, and between proximate and remote past and future times.