Association of Anxiety Awareness with Risk Factors of Cognitive Decline in MCI

Mild cognitive impairment estimation based on functional near-infrared spectroscopy

Patients with mild cognitive impairment (MCI) are at a high risk of developing future dementia. However, early identification and active intervention could potentially reduce its morbidity and the incidence of dementia. Functional near-infrared spectroscopy (fNIRS) has been proposed as a noninvasive modality for detecting oxygenation changes in the time-varying hemodynamics of the prefrontal cortex. This study sought to provide an effective method for detecting patients with MCI using fNIRS and the Wisconsin card sorting test (WCST) to evaluate changes in blood oxygenation. The results revealed that all groups with a lower mini-mental state examination grade had a higher increase in HHb concentration during a modified WCST (MCST). The increase in the change in oxygenated hemoglobin concentration in the stroke group was smaller than that in the normal group due to weak cerebrovascular reactivity.

Theory of mind in older adults: the nature of the decline

Successful social interaction depends (among others) on one's ability to understand other people's emotional states (known as "affective-Theory-of-Mind"; aToM). A decline in this ability could be associated with changes in awareness with age. Awareness can be estimated by comparing one's subjective and objective abilities. Here we explored the sequence of changes in aToM with age, with reference to objective and subjective capacities. One hundred and eight participants were divided into three age groups: young (18-39), adults (60-69), and elders' group (70-86). Objective aToM performance was assessed using the Frith-Happé animation task (including meaningful and meaningless interactions). The subjective performance was evaluated by a Short Subjective ToM Questionnaire (sToM10). The results in the animation task showed reduction in the ability to correctly categorize meaningless interaction among the adult participants (compared to young) and a further decrease in the ability to correctly categorize meaningful interactions among the elderly participants (compared to young participants). Subjective aToM results revealed that while older participants reported a reduction in general ability to infer feelings in others, they could not report a decrease in their ability to recognize specific feelings. Our results may indicate a unique characteristic of aToM decline, which may start in adults (60-69; only reflected when the social demands are high) and further aggravates as people grow older (70th and above). In addition, results of the self-report questionnaire may indicate that while the elders are fully aware of their general decline in aToM ability, awareness of their capability to identify specific emotions is impaired.

New Contemplation Upon Subjective Memory Complaints as a Self- Report Criterion for MCI Diagnosis

BACKGROUND

Subjective memory complaints are a key component in mild cognitive impairment (MCI) diagnosis. However, studies that examined memory awareness among MCI participants have published contradictory results. One possible explanation for the inconsistent findings could be the disregard from the multidimensional structure of subjective memory.

OBJECTIVES

The present study is directed at assessing subjective memory among healthy and MCI participants, referring to three main types of memory: episodic, semantic, and working memory.

METHODS

Participants were 123 adults (aged 50-90). They were divided into two groups, the MCI group, and the control group, according to their objective cognitive performance in RAVL or Mo- CA tests. All participants filled a subjective memory questionnaire, assessing their awareness of episodic, semantic, and working memory.

RESULTS

MCI participants estimated their semantic memory as significantly lower in comparison to the estimation of the healthy controls. By contrast, MCI participants showed an overestimation of their episodic memory capabilities compared to the control group. No significant difference was found between groups (MCI and healthy controls) in evaluating their working memory. In addition, for both groups, Pearson's correlation revealed a significant negative correlation between age and semantic memory evaluation. Such correlation was not found for subjective episodic memory.

DISCUSSION

Findings suggest that while people with MCI exhibit poor awareness of their episodic and working memory capabilities, their awareness of their decrease in semantic memory is apparently intact. Therefore, it is suggested that when using the self-report criterion for MCI diagnosis, clinicians should consider the patient's' semantic memory complaints.

The Concept of Advanced Multi-Sensor Monitoring of Human Stress

Many people live under stressful conditions which has an adverse effect on their health. Human stress, especially long-term one, can lead to a serious illness. Therefore, monitoring of human stress influence can be very useful. We can monitor stress in strictly controlled laboratory conditions, but it is time-consuming and does not capture reactions, on everyday stressors or in natural environment using wearable sensors, but with limited accuracy. Therefore, we began to analyze the current state of promising wearable stress-meters and the latest advances in the record of related physiological variables. Based on these results, we present the concept of an accurate, reliable and easier to use telemedicine device for long-term monitoring of people in a real life. In our concept, we ratify with two synchronized devices, one on the finger and the second on the chest. The results will be obtained from several physiological variables including electrodermal activity, heart rate and respiration, body temperature, blood pressure and others. All these variables will be measured using a coherent multi-sensors device. Our goal is to show possibilities and trends towards the production of new telemedicine equipment and thus, opening the door to a widespread application of human stress-meters.