How does aging affect our ability to sense our own body?

How is interoception defined in the introduction of this paper?

Interoception is defined as the perception of the physical condition of the body, which includes visceral sensations like hunger, itch, and respiratory or cardiac awareness.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What two major domains of higher-order cognition have been linked to interoception in previous research?

Emotional processing and risky decision making have both been linked to interoceptive abilities.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What was the primary objective of Study One?

The objective was to examine changes in self-reported interoceptive awareness (sensibility) across the adult lifespan.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

Under the Garfinkel et al. (2015) framework, what is the term used to describe self-reported awareness of interoceptive signals?

Self-reported interoceptive awareness is known as interoceptive sensibility.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

Which questionnaire was used to measure interoceptive awareness in Study One, and how many items does it contain?

The very short version of the Body Perception Questionnaire (BPQ) was used, containing 12 items.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What inclusion criteria were applied to screen and select the final 345 participants in Study One?

Participants had to fully complete the survey, report no pre-existing psychiatric conditions, and speak English as their first language.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What association was found between age and Body Perception Questionnaire (BPQ) scores in Study One?

A significant negative correlation was found, indicating that self-reported interoceptive awareness declines across the lifespan.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

Were there any significant sex differences found in interoceptive awareness scores in Study One?

No, there were no significant sex differences in BPQ scores.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What are the two most commonly used objective methods for measuring cardiac interoceptive accuracy?

The two primary objective methods are the heartbeat tracking task (Schandry) and heartbeat discrimination procedures.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What screening tool was used in Study Two to exclude participants with cognitive impairment, and what was the threshold score?

The Mini Mental State Examination (MMSE) was used, with scores below 23 indicating cognitive impairment.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What restriction was placed on Study Two participants prior to testing to control for elevated heart rate?

Participants were asked to refrain from consuming caffeine for 6 hours prior to testing.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

Briefly describe the instructions given to participants during the heartbeat tracking task in Study Two.

Participants were instructed to silently count their heartbeats with eyes closed from "start" until they heard a beep, counting only felt beats without guessing.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What control task was utilized in Study Two to ensure performance was not due to basic counting or timing abilities?

A timing task was used, which was identical to the heartbeat task except participants counted elapsed seconds rather than heartbeats.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What formula was used to calculate the interoceptive accuracy score in Study Two?

The score is calculated as: ̴̃[1 - (|Actual heartbeats - Estimated heartbeats| / Actual heartbeats)] * 100.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What estimation bias (underestimation vs. overestimation) was exhibited by the majority of participants in Study Two?

Over 95% of participants underestimated their heartbeats, and over 80% underestimated elapsed time.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

How was the 'beliefs regarding heartrate' variable measured and scored in Study Two?

Participants estimated the average person's resting heart rate in 1 minute, and their score was calculated as the absolute difference between their estimate and the physiological grand mean of 72.26 bpm.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What physiological metric was used as a proxy for heart rate variability (HRV), and why was it chosen?

The RMSSD (root mean squared of successive differences) was chosen due to its superior reliability over short recording durations.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What was the zero-order correlation between age and interoceptive accuracy in Study Two?

A significant negative correlation was found (r = -0.21, p = 0.008), indicating that objective interoceptive accuracy declines as age increases.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

Was the age-related decline in performance significantly different between the interoceptive accuracy task and the timing control task?

No, a formal statistical comparison showed that the correlation sizes between age and interoceptive accuracy versus age and timing accuracy did not significantly differ.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

Which physiological variables showed a significant zero-order correlation with age in Study Two?

BMI was positively correlated with age, while heart rate variability (HRV) was negatively correlated with age.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

Which non-age variables had significant zero-order correlations with interoceptive accuracy in Study Two?

BMI and inaccurate heart rate beliefs were negatively correlated with accuracy, while systolic blood pressure was positively correlated.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

What potential mediators were entered into Study Two's parallel mediation model of age and interoceptive accuracy?

The mediators were BMI, gender, systolic blood pressure, heart rate beliefs accuracy, heart rate variability (HRV), mean heart rate, and timing accuracy.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI

Did age exert a direct (unmediated) effect on interoceptive accuracy in Study Two's parallel mediation model?

Yes, age had a significant direct, unmediated effect on interoceptive accuracy (b = -0.15, p = 0.047).

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

Which specific variable acted as a significant mediator of the relationship between age and interoceptive accuracy in Study Two?

BMI partially mediated the relationship, accounting for 18% of the total effect.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

Which physiological and psychological factors did NOT act as significant mediators of the age-interoception relationship, despite past literature?

Heart rate variability, resting heart rate, and time perception did not act as significant mediators.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

How did the authors rule out general cognitive decline or motivation issues as the cause of the age-related interoceptive decline?

The mediation analysis showed that the effects of age on interoceptive accuracy were independent of performance on the timing/counting control task.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified

Why might the effect of age on interoceptive accuracy have been more modest in this study compared to Khalsa et al. (2009)?

This study used the heartbeat tracking task (Schandry), whereas Khalsa et al. used the heartbeat discrimination task, which is more demanding because it requires integrating external and internal signals.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI

Why is interoceptive metacognition (awareness of one's own accuracy) practically important for aging adults?

If older adults are aware of their declining interoception, they can use external strategies (like tracking water intake) to avoid adverse health outcomes like dehydration.

Source: Direct and indirect effects of age on interoceptive accuracy and awareness across the adult lifespan · DOI · quote verified