Posterior parietal cortex contributions to cross-modal brain plasticity upon sensory loss

Gilissen, Sara; Arckens, Lutgarde

doi:10.1016/j.conb.2020.07.001

Cited by 9 publications

(7 citation statements)

References 86 publications

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“…It may also occur later in life in older adults with age-related hearing loss who usually start developing hearing impairment in middle age (World Health Organization, 2021). With cross-modal plasticity, previous research suggested an inverse relationship between improved visual abilities and speech recognition (Glick and Sharma, 2017;Gilissen and Arckens, 2021). We also found that our dementia cohort tend to report lower speech recognition and understanding (Utoomprurkporn et al, 2021a).…”

Section: Possible Explanations For Improved Visuospatial Abilitysupporting

confidence: 76%

The Impact of Hearing Loss and Hearing Aid Usage on the Visuospatial Abilities of Older Adults in a Cohort of Combined Hearing and Cognitive Impairment

Utoomprurkporn

Stott

Costafreda

et al. 2022

Front. Aging Neurosci.

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IntroductionIt has been proposed that hearing loss may result in improved visuospatial abilities. The evidence for this assertion is inconsistent, and limited to studies in congenitally deaf children, despite older adults with age-related hearing loss constituting the vast majority of the hearing impaired population. We assessed visuospatial (visuoconstruction and visuospatial memory) ability in older adult hearing aid users with and without clinically significant cognitive impairment. The primary aim of the study was to determine the effect of hearing loss on visuospatial abilities.MethodSeventy-five adult hearing aid users (HA) aged over 65 were recruited, out of whom 30 had normal cognition (NC-HA), 30 had mild cognitive impairment (MCI-HA), and 15 had dementia (D-HA). The Rey Osterrieth Complex figure test (ROCFT) copy, 3 min recall and 30 min recall tests were performed to evaluate the visuoconstructional and visuospatial memory abilities of the participants.ResultsThere were significant differences between the ROCFT copy, 3 min recall, and 30 min recall among the three cohorts (p < 0.005). Compared with previously published normative data, the NC-HA performed significantly better in the ROCFT copy (p < 0.001), immediate recall (p < 0.001), and delay recall (p = 0.001), while the MCI-HA performed similarly to the expected norms derived from population (p = 0.426, p = 0.611, p = 0.697, respectively), and the D-HA performed below this norm.ConclusionThough visuospatial abilities tend to decline when the global cognitive functioning declines, we found suggestive evidence for positive effects of age-related hearing loss on visuospatial cognitive ability. Participants with mild cognitive impairment and hearing loss, who would have been expected to perform worse than normative data, were in fact performing as well as cognitively healthy subjects without hearing loss. Visuospatial ability could be targeted when providing rehabilitation for the older adults with hearing loss.

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Section: Possible Explanations For Improved Visuospatial Abilitysupporting

confidence: 76%

The Impact of Hearing Loss and Hearing Aid Usage on the Visuospatial Abilities of Older Adults in a Cohort of Combined Hearing and Cognitive Impairment

Utoomprurkporn

Stott

Costafreda

et al. 2022

Front. Aging Neurosci.

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“…The neurobiological explanation for this phenomenon can be linked to the concept of sensory compensation and memory encoding [ 26 , 27 ]. Sensory compensation refers to the brain's ability to reorganize and enhance the processing of remaining sensory information when one sensory modality is compromised.…”

Section: Discussionmentioning

confidence: 99%

When Imagination Feels Like Reality: A Case Study of False Memories and Maladaptive Daydreaming in Visual Impairment

Somer

2024

Case Reports in Psychiatry

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Background. When a person experiences maladaptive daydreaming (MD), they spend a prolonged period daydreaming with a strong sense of presence. The symptoms of MD are often excessive, interfere with functioning, and are linked to distress and comorbid mental disorders. In this paper, apparent false memory is described in the context of a woman with MD and visual impairment due to a progressive eye condition. Her vivid daydreams seemed indistinguishable from actual memories. Case Report. A 35-year-old woman with a lifelong MD reported three incidents of fabricating detailed false memories of events that her family confirmed never occurred: obtaining a new job, miscarrying twins, and hospitalization for COVID-19. She experienced anxiety and shame when the stories were disproven. The assessment confirmed MD, PTSD, OCD, and other disorders. Her verbal memory was below average, especially for longer narratives. Her misattributions of daydreams as real-life memories may relate to reliance on vivid mental images over deteriorating vision and source monitoring deficits. Conclusion. This first reported case of confabulations in an individual with MD and visual disability suggests daydreams could potentially be mistaken for actual events in some MD cases. While sensitive, more research is needed on the prevalence of false memories among individuals with MD. The default mode network, prefrontal cortex, and their connectivity may be implicated in generating vivid daydreams and misattributing them to actual episodic events. Understanding the relationship between sensory impairments, dissociation, and susceptibility to memory distortions could inform interventions to improve reality testing for some MD patients.

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“…An fMRI study that presented movies to human participants reported that medial posterior parietal cortex (precuneus) accumulates information up to 12 s (Hasson et al, 2008). We argued that the long TRW allows the dmPPC to accumulate the continuous information of multifaceted representations from unimodal or integration of cross-modal inputs (Gilissen & Arckens, 2021) to support processing stream of past experiences for episode. This aligns with the higher temporal dynamics in the precuneus when remembering the unfolding of events that included a high density of experience units (Jeunehomme et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Mixed selectivity coding of content-temporal detail by dorsomedial posterior parietal neurons

Wang

Zhou

Zeng

et al. 2022

Preprint

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The dorsomedial posterior parietal cortex is part of a higher-cognition network implicated in elaborate processes underpinning memory formation, recollection, episodes reconstruction, and temporal processing. Neural coding for complex episodic processing is however largely undocumented. Here we revealed a set of neural codes of 'neuroethogram' in the primate parietal cortex. Analyzing neural responses in macaque dmPPC to naturalistic videos, we discovered several groups of neurons that are sensitive to categories of ethogram-items and to low-level sensory features. The amount of information coded within these multiplex representations in turn increases our trained classifier decodability for different video-types. We further discovered that the processing of category and feature information by these neurons is sustained by accumulation of temporal information over a long timescale, corroborating its role at the apex of the cortical hierarchy of temporal receptive windows. Taken altogether, these neural findings explain how dorsomedial PPC weaves fabrics of ongoing experiences together in real-time and realize a multiplex representation of an organism's past. The high dimensionality of neural representations should motivate us to shift the focus of attention from pure selectivity neurons to mixed selectivity neurons, especially in increasingly complex naturalistic task designs.

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Posterior parietal cortex contributions to cross-modal brain plasticity upon sensory loss

Cited by 9 publications

References 86 publications

The Impact of Hearing Loss and Hearing Aid Usage on the Visuospatial Abilities of Older Adults in a Cohort of Combined Hearing and Cognitive Impairment

The Impact of Hearing Loss and Hearing Aid Usage on the Visuospatial Abilities of Older Adults in a Cohort of Combined Hearing and Cognitive Impairment

When Imagination Feels Like Reality: A Case Study of False Memories and Maladaptive Daydreaming in Visual Impairment

Mixed selectivity coding of content-temporal detail by dorsomedial posterior parietal neurons

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