scholarly journals Effect of informational content of noise on speech representation in the aging midbrain and cortex

2016 ◽  
Vol 116 (5) ◽  
pp. 2356-2367 ◽  
Author(s):  
Alessandro Presacco ◽  
Jonathan Z. Simon ◽  
Samira Anderson
Keyword(s):  
Older Adults ◽  
Speech Signal ◽  
Informational Content ◽  
Cognitive Resources ◽  
Noisy Environments ◽  
Aging Effects ◽  
Contextual Cues ◽  
Age Related ◽  
Behavioral Studies ◽  
Cortical Responses

The ability to understand speech is significantly degraded by aging, particularly in noisy environments. One way that older adults cope with this hearing difficulty is through the use of contextual cues. Several behavioral studies have shown that older adults are better at following a conversation when the target speech signal has high contextual content or when the background distractor is not meaningful. Specifically, older adults gain significant benefit in focusing on and understanding speech if the background is spoken by a talker in a language that is not comprehensible to them (i.e., a foreign language). To understand better the neural mechanisms underlying this benefit in older adults, we investigated aging effects on midbrain and cortical encoding of speech when in the presence of a single competing talker speaking in a language that is meaningful or meaningless to the listener (i.e., English vs. Dutch). Our results suggest that neural processing is strongly affected by the informational content of noise. Specifically, older listeners' cortical responses to the attended speech signal are less deteriorated when the competing speech signal is an incomprehensible language rather than when it is their native language. Conversely, temporal processing in the midbrain is affected by different backgrounds only during rapid changes in speech and only in younger listeners. Additionally, we found that cognitive decline is associated with an increase in cortical envelope tracking, suggesting an age-related over (or inefficient) use of cognitive resources that may explain their difficulty in processing speech targets while trying to ignore interfering noise.

scholarly journals Strategies and cognitive reserve to preserve lexical production in aging

GeroScience ◽  
2021 ◽  
Author(s):  
Monica Baciu ◽  
Sonja Banjac ◽  
Elise Roger ◽  
Célise Haldin ◽  
Marcela Perrone-Bertolotti ◽  
...  
Keyword(s):  
Older Adults ◽  
Cognitive Aging ◽  
Individual Variability ◽  
Future Research ◽  
Aging Effects ◽  
Main Hypothesis ◽  
Compensatory Strategies ◽  
Age Related ◽  
Complementary Domain

AbstractIn the absence of any neuropsychiatric condition, older adults may show declining performance in several cognitive processes and among them, in retrieving and producing words, reflected in slower responses and even reduced accuracy compared to younger adults. To overcome this difficulty, healthy older adults implement compensatory strategies, which are the focus of this paper. We provide a review of mainstream findings on deficient mechanisms and possible neurocognitive strategies used by older adults to overcome the deleterious effects of age on lexical production. Moreover, we present findings on genetic and lifestyle factors that might either be protective or risk factors of cognitive impairment in advanced age. We propose that “aging-modulating factors” (AMF) can be modified, offering prevention opportunities against aging effects. Based on our review and this proposition, we introduce an integrative neurocognitive model of mechanisms and compensatory strategies for lexical production in older adults (entitled Lexical Access and Retrieval in Aging, LARA). The main hypothesis defended in LARA is that cognitive aging evolves heterogeneously and involves complementary domain-general and domain-specific mechanisms, with substantial inter-individual variability, reflected at behavioral, cognitive, and brain levels. Furthermore, we argue that the ability to compensate for the effect of cognitive aging depends on the amount of reserve specific to each individual which is, in turn, modulated by the AMF. Our conclusion is that a variety of mechanisms and compensatory strategies coexist in the same individual to oppose the effect of age. The role of reserve is pivotal for a successful coping with age-related changes and future research should continue to explore the modulating role of AMF.

scholarly journals Aging effects on neural processing of rhythm and meter

2022 ◽  
Author(s):  
Sarah Anne Sauvé ◽  
Emily Bolt ◽  
Sylvie Nozaradan ◽  
Benjamin Zendel
Keyword(s):  
Older Adults ◽  
Hearing Loss ◽  
Brain Activity ◽  
Aging Effects ◽  
Brain Response ◽  
Younger Adults ◽  
Musical Rhythm ◽  
Low Level ◽  
Age Related ◽  
Rhythm And Meter

When listening to musical rhythm, humans can perceive and move to beat-like metrical pulses. Recently, it has been hypothesized that meter perception is related to brain activity responding to the acoustic fluctuation of the rhythmic input, with selective enhancement of the brain response elicited at meter-related frequencies. In the current study, the electroencephalography (EEG) was recorded while younger (<35) and older (>60) adults listened to rhythmic patterns presented at two different tempi while intermittently performing a tapping task. Despite significant hearing loss compared to younger adults, older adults showed preserved brain activity to the rhythms. However, age effects were observed in the distribution of amplitude across frequencies. Specifically, in contrast with younger adults, older adults showed relatively larger amplitude at the frequency corresponding to the rate of individual events making up the rhythms as compared to lower meter-related frequencies. This difference is compatible with larger N1-P2 potentials as generally observed in older adults in response to acoustic onsets, irrespective of meter perception. These larger low-level responses to sounds have been linked to processes by which age-related hearing loss would be compensated by cortical sensory mechanisms. Importantly, this low-level effect would be associated here with relatively reduced neural activity at lower frequencies corresponding to higher-level metrical grouping of the acoustic events, as compared to younger adults.

scholarly journals High Gamma Cortical Processing of Continuous Speech in Younger and Older Listeners

2019 ◽  
Author(s):  
Joshua P. Kulasingham ◽  
Christian Brodbeck ◽  
Alessandro Presacco ◽  
Stefanie E. Kuchinsky ◽  
Samira Anderson ◽  
...  
Keyword(s):  
Older Adults ◽  
Right Hemisphere ◽  
Acoustic Stimulus ◽  
Auditory Pathway ◽  
List Type ◽  
Continuous Speech ◽  
Speech Stimuli ◽  
Age Related ◽  
Cortical Responses ◽  
High Gamma

AbstractNeural processing along the ascending auditory pathway is often associated with a progressive reduction in characteristic processing rates. For instance, the well-known frequency-following response (FFR) of the auditory midbrain, as measured with electroencephalography (EEG), is dominated by frequencies from ∼100 Hz to several hundred Hz, phase-locking to the acoustic stimulus at those frequencies. In contrast, cortical responses, whether measured by EEG or magnetoencephalography (MEG), are typically characterized by frequencies of a few Hz to a few tens of Hz, time-locking to acoustic envelope features. In this study we investigated a crossover case, cortically generated responses time-locked to continuous speech features at FFR-like rates. Using MEG, we analyzed responses in the high gamma range of 70–200 Hz to continuous speech using neural source-localized reverse correlation and the corresponding temporal response functions (TRFs). Continuous speech stimuli were presented to 40 subjects (17 younger, 23 older adults) with clinically normal hearing and their MEG responses were analyzed in the 70–200 Hz band. Consistent with the relative insensitivity of MEG to many subcortical structures, the spatiotemporal profile of these response components indicated a cortical origin with ∼40 ms peak latency and a right hemisphere bias. TRF analysis was performed using two separate aspects of the speech stimuli: a) the 70–200 Hz carrier of the speech, and b) the 70–200 Hz temporal modulations in the spectral envelope of the speech stimulus. The response was dominantly driven by the envelope modulation, with a much weaker contribution from the carrier. Age-related differences were also analyzed to investigate a reversal previously seen along the ascending auditory pathway, whereby older listeners show weaker midbrain FFR responses than younger listeners, but, paradoxically, have stronger cortical low frequency responses. In contrast to both these earlier results, this study did not find clear age-related differences in high gamma cortical responses to continuous speech. Cortical responses at FFR-like frequencies shared some properties with midbrain responses at the same frequencies and with cortical responses at much lower frequencies.HighlightsCortical MEG responses time-lock at 80–90 Hz to continuous speechResponses primarily driven by high gamma rate fluctuations of the speech envelopeResponse strength and latency are similar for younger and older adults

scholarly journals Cortical Responses to the Amplitude Envelopes of Sounds Change with Age

2020 ◽  
Author(s):  
Vanessa C. Irsik ◽  
Ala Almanaseer ◽  
Ingrid S. Johnsrude ◽  
Björn Herrmann
Keyword(s):  
Older Adults ◽  
Auditory Cortex ◽  
Cortical Excitability ◽  
Neural Synchronization ◽  
Speech In Noise ◽  
Age Related ◽  
Cortical Responses ◽  
Sound Features ◽  
Experience Difficulty ◽  
Age Related Changes

AbstractMany older listeners have difficulty understanding speech in noise, when cues to speech-sound identity are less redundant. The amplitude envelope of speech fluctuates dramatically over time, and features such as the rate of amplitude change at onsets (attack) and offsets (decay) signal critical information about the identity of speech sounds. Aging is also thought to be accompanied by increases in cortical excitability, which may differentially alter sensitivity to envelope dynamics. Here, we recorded electroencephalography in younger and older human adults (of both sexes) to investigate how aging affects neural synchronization to 4-Hz amplitude-modulated noises with different envelope shapes (ramped: slow attack & sharp decay; damped: sharp attack & slow decay). We observed that subcortical responses did not differ between age groups, whereas older compared to younger adults exhibited larger cortical responses to sound onsets, consistent with an increase in auditory cortical excitability. Older adults showed increased neural synchronization when the envelope shape was damped compared to ramped, whereas younger participants showed the opposite pattern. Furthermore, the response shape of synchronized neural activity was more sinusoidal in younger individuals, whereas synchronized activity in older adults was less sinusoidal and more peaked. The current results suggest that age-related changes in the excitability of auditory cortex alter responses to envelope dynamics, and this may be part of the reason why older adults experience difficulty understanding speech in noise.Significance StatementMany adults above age 50 report difficulty understanding speech when there is background noise, which can trigger social withdrawal and negative psychosocial health outcomes. The difficulty may be related to age-related changes in how the brain processes temporal sound features. We tested younger and older people on their sensitivity to different envelope shapes, using EEG. Our results demonstrate that aging is associated with heightened sensitivity to sounds with a sharp attack and gradual decay, and sharper neural responses that deviate from the sinusoidal features of the stimulus, perhaps reflecting increased excitability in the aged auditory cortex. Altered responses to temporal sound features may be part of the reason why older adults often experience difficulty understanding speech in social situations.

Role of Emotion and Cognition on Age Differences in the Framing Effect

2017 ◽  
Vol 85 (3) ◽  
pp. 305-325 ◽  
Author(s):  
Bingyan Pu ◽  
Huamao Peng ◽  
Shiyong Xia
Keyword(s):  
Older Adults ◽  
Age Differences ◽  
Cognitive Abilities ◽  
Emotional Arousal ◽  
Framing Effect ◽  
Cognitive Resources ◽  
Age Difference ◽  
Younger Adults ◽  
Age Related ◽  
Life Saving

Framing effect studies indicate that individuals are risk averse for decisions framed as gains but risk-seeking for decisions framed as losses. Findings of age-related differences in susceptibility to framing are mixed. In the current study, we examined emotional arousal in two decision tasks (life saving vs. money gambling) to evaluate the effects of emotion on age differences in the framing effect. When cognitive abilities and styles were controlled, there was a framing effect in the younger group in the life-saving task, a high-emotional arousal task, while older adults did not display this classic framing effect pattern. They showed risk aversion in both positive and negative framing. Age differences existed in the framing effect. Conversely, younger and older adults in the money-gambling task both displayed the framing effect; there was no age difference. When the cognitive abilities were not controlled, the pattern of results in the high-emotional arousal task remained unchanged, while greater framing effects were found, from the perspective of effect size, for older than younger adults in the low-emotional arousal task. Limited cognitive resources would not hamper older adults’ performances when their emotional arousal was high. However, older adults with low-level emotional arousal were more susceptible than younger adults to framing because of declining cognitive capacities. This implied the importance of emotion in older adults’ decision making and supported the selective engagement hypothesis.

scholarly journals Age and Cognitive Ability Predict Perceived Demands of Specific Emotion Regulation Strategies

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 454-455
Author(s):  
Claire Growney ◽  
Tammy English
Keyword(s):  
Older Adults ◽  
Emotion Regulation ◽  
Cognitive Ability ◽  
Process Model ◽  
Well Being ◽  
Cognitive Resources ◽  
Younger Adults ◽  
Perceived Effort ◽  
Age Related ◽  
Specific Emotion

Abstract Certain emotion regulation (ER) strategies are often considered to be more or less demanding of cognitive resources. However, age-related differences in the perceptions of these demands are not yet understood. Older adults might perceive greater demands for certain strategies due to differences in cognitive ability and motivation to maintain emotional well-being. In the present study, we examined age and cognitive ability as predictors of perceived effort required to use ER strategies that span all families of the process model. A diverse sample of community participants (age 22-83) completed assessments of cognitive ability and perceived demands associated with ten ER strategies. Overall, response-focused strategies were rated as highest in demands whereas situation selection and savoring were perceived as least demanding. Older adults reported higher demands associated with situation selection, distraction, and detached reappraisal (but not positive reappraisal) compared with younger adults. Cognitive ability was not associated with perceived demands for ER strategies traditionally viewed as cognitively demanding (e.g., suppression). Rather, higher cognitive ability only predicted lower perceived demands for strategies often considered low in demand: situation selection and savoring. Perceived ER success was not consistently associated with age or cognitive demands. Results suggest that older adults view some, but not all, ER strategies as more demanding than younger adults do. The role of cognitive ability in age-related changes in ER may be more complex than previously expected. Notably, the lack of findings with perceived ER success suggest effort requirements associated with ER may not impede ability to successfully regulate across adulthood.

Age-Related Differences in Sequential Modulations of Poorer-Strategy Effects

2014 ◽  
Vol 61 (4) ◽  
pp. 253-262 ◽  
Author(s):  
Patrick Lemaire ◽  
Thomas Hinault
Keyword(s):  
Older Adults ◽  
Executive Control ◽  
Error Rates ◽  
Control Mechanisms ◽  
Strategy Execution ◽  
Aging Effects ◽  
Estimation Task ◽  
Younger Adults ◽  
Computational Estimation ◽  
Age Related

To determine how younger and older adults modulate execution of strategies across successive trials, we asked participants to accomplish a computational estimation task (i.e., provide approximate products to two-digit multiplication problems like 38 × 74). For each problem, they were cued to execute a better versus a poorer strategy. Their performance revealed sequential modulations of poorer-strategy effects (i.e., longer solution times and larger error rates when asked to execute a poorer than a better strategy). That is, poorer-strategy effects were smaller on current problems after using a poorer strategy on preceding problems than after using a better strategy. Moreover, sequential modulations of these poorer-strategy effects were smaller in older than in younger adults, especially older adults with low-cognitive control skills (as measured by conflict adaptation effects in the Simon task). Our findings suggest that these sequential modulations may result from executive control mechanisms, the efficiency of which is known to decrease in older adults. These findings have important implications regarding mechanisms underlying strategy execution and aging effects on strategic variations.

Motivation and the Social Context of Aging and Decision Making

2021 ◽  
pp. 234-251
Author(s):  
JoNell Strough ◽  
Kelly Smith
Keyword(s):  
Older Adults ◽  
Decision Making ◽  
Cognitive Aging ◽  
Life Experience ◽  
Future Research ◽  
Cognitive Resources ◽  
Adult Age ◽  
Age Related ◽  
The Social ◽  
Motivational Influences

This chapter focuses on the role of motivation for understanding adult age differences in decision making. It begins by reviewing research on cognitive aging and decision making. It then reviews research that highlights older adults’ motivation to selectively allocate cognitive resources when making decisions and their motivation to draw upon life experience and emotion regulation strategies. Next, because age-related shifts in motivation accentuate a focus on meaningful social relationships, the chapter considers social aspects of aging and decision making. It discusses age-related differences in selection of social network members and considers factors that may motivate older adults to involve others in the decision-making process. It suggests how research on motivation and aging and decision making could be used to inform decision-making interventions. After suggesting directions for future research, it concludes by highlighting the implications of research on aging and decision making for understanding contextual and motivational influences on cognitive aging.

Aging Effects on the Neuroplastic Attributes of Multisensory Cortical Networks as Triggered by a Computerized Music Reading Training Intervention

2020 ◽  
Vol 31 (1) ◽  
pp. 123-137
Author(s):  
Evangelos Paraskevopoulos ◽  
Nikolas Chalas ◽  
Alexandros Karagiorgis ◽  
Maria Karagianni ◽  
Charis Styliadis ◽  
...  
Keyword(s):  
Older Adults ◽  
Multisensory Integration ◽  
Inferior Frontal Gyrus ◽  
Music Reading ◽  
Aging Effects ◽  
Younger Adults ◽  
Brain Functioning ◽  
Age Related ◽  
Multisensory Learning ◽  
Computer Based

Abstract The constant increase in the graying population is the result of a great expansion of life expectancy. A smaller expansion of healthy cognitive and brain functioning diminishes the gains achieved by longevity. Music training, as a special case of multisensory learning, may induce restorative neuroplasticity in older ages. The current study aimed to explore aging effects on the cortical network supporting multisensory cognition and to define aging effects on the network’s neuroplastic attributes. A computer-based music reading protocol was developed and evaluated via electroencephalography measurements pre- and post-training on young and older adults. Results revealed that multisensory integration is performed via diverse strategies in the two groups: Older adults employ higher-order supramodal areas to a greater extent than lower level perceptual regions, in contrast to younger adults, indicating an age-related shift in the weight of each processing strategy. Restorative neuroplasticity was revealed in the left inferior frontal gyrus and right medial temporal gyrus, as a result of the training, while task-related reorganization of cortical connectivity was obstructed in the group of older adults, probably due to systemic maturation mechanisms. On the contrary, younger adults significantly increased functional connectivity among the regions supporting multisensory integration.

scholarly journals Cultural Differences in Susceptibility to Stereotype Threat: France versus India

2020 ◽  
Author(s):  
Poshita Nicolas ◽  
Isabelle Régner ◽  
Patrick Lemaire
Keyword(s):  
Older Adults ◽  
Stereotype Threat ◽  
Cultural Differences ◽  
Human Cognition ◽  
Strategy Selection ◽  
Arithmetic Problem ◽  
Aging Effects ◽  
Cognitive Domains ◽  
Cultural Contexts ◽  
Age Related

Abstract Objectives Negative aging stereotypes make older adults perform below their true potential in a number of cognitive domains. This phenomenon, known as Age-Based Stereotype Threat, is currently viewed as a powerful factor contributing to an overestimation of cognitive decline in normal aging. However, age-based stereotype threat has been investigated almost exclusively in Western countries. Whether this phenomenon is universal or culture-specific is unknown. Method Here, we first ran a pilot study (N = 106) in which we assessed French and Indian participants’ attitudes towards aging. Then, we assessed stereotype threat effects on arithmetic problem-solving performance and strategies in French and Indian older adults (N = 104). Results We found that French older adults have more negative implicit attitudes towards aging than Indian older adults. We also found that culture modulates age-based stereotype threat effects. Whereas French older adults experienced stereotype threat on both selection and execution of strategies on all arithmetic problems, Indian older adults experienced this threat only in their strategy selection on harder problems. Most interestingly, cultural differences emerged on arithmetic problems under stereotype threat condition, where otherwise no cultural differences were found in the control condition. Discussion Our findings have important implications for understanding how cultural contexts change aging effects on human cognition and age-related difference in cognitive performance.

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