Ege Kingir
@ege-kingir.bsky.social
PhD candidate at the Heart and Brain Center Göttingen.
Trying to understand the influence of the heart on visual perception.
Trying to understand the influence of the heart on visual perception.
And most importantly, special thanks to my supervisors Melanie Wilke and Caspar Schwiedrzik, and my former MSc mentee Sukanya Chakraborty! ✨
August 25, 2025 at 10:14 AM
And most importantly, special thanks to my supervisors Melanie Wilke and Caspar Schwiedrzik, and my former MSc mentee Sukanya Chakraborty! ✨
While our use case was visual perception, ACD is super relevant in many other tasks. What excites me is the potential use and further development of this approach in a diverse array of cognitive tasks with anticipation, action-prep, and error-processing to better estimate ACD in these contexts! 🧠
August 25, 2025 at 10:14 AM
While our use case was visual perception, ACD is super relevant in many other tasks. What excites me is the potential use and further development of this approach in a diverse array of cognitive tasks with anticipation, action-prep, and error-processing to better estimate ACD in these contexts! 🧠
Despite the small effect size, dissociating the total ACD into its respiratory (RSA) and non-respiratory (ACD) components showed that decreased RSA and a steeper rise in ACD are associated with visual detection.
August 25, 2025 at 10:14 AM
Despite the small effect size, dissociating the total ACD into its respiratory (RSA) and non-respiratory (ACD) components showed that decreased RSA and a steeper rise in ACD are associated with visual detection.
While the amplitude of the sine wave in our method corresponds to the amount of RSA, the vertical offset represents the respiratory-phase-independent modulation of the heart rate. In our case, the positive offset is ACD (left). We see that RSA and ACD-based modulations do not co-fluctuate (right).
August 25, 2025 at 10:14 AM
While the amplitude of the sine wave in our method corresponds to the amount of RSA, the vertical offset represents the respiratory-phase-independent modulation of the heart rate. In our case, the positive offset is ACD (left). We see that RSA and ACD-based modulations do not co-fluctuate (right).
So, can the ACD only be caused by this respiratory phase-alignment? We saw that there is a pattern of cardiac deceleration during both exhalation and inhalation, so probably not.
But how to properly quantify a respiratory-phase-independent deceleration?
But how to properly quantify a respiratory-phase-independent deceleration?
August 25, 2025 at 10:14 AM
So, can the ACD only be caused by this respiratory phase-alignment? We saw that there is a pattern of cardiac deceleration during both exhalation and inhalation, so probably not.
But how to properly quantify a respiratory-phase-independent deceleration?
But how to properly quantify a respiratory-phase-independent deceleration?
Interestingly, our subjects aligned their respiratory phase to exhalation (breathing out) during stimulus anticipation, which in itself supports cardiac deceleration due to RSA. And the amount of RSA in the anticipation window was correlated with the amount of ACD at the between-subject level.
August 25, 2025 at 10:14 AM
Interestingly, our subjects aligned their respiratory phase to exhalation (breathing out) during stimulus anticipation, which in itself supports cardiac deceleration due to RSA. And the amount of RSA in the anticipation window was correlated with the amount of ACD at the between-subject level.
We present a simple sinusoidal modeling approach to estimate trial-averaged RSA amplitudes for each subject during the anticipation window of our visual perception task (threshold-level visual stimulus detection).
August 25, 2025 at 10:14 AM
We present a simple sinusoidal modeling approach to estimate trial-averaged RSA amplitudes for each subject during the anticipation window of our visual perception task (threshold-level visual stimulus detection).
...but this inevitably leads to contamination from permanent heart rate oscillations driven by respiration (Respiratory Sinus Arrhythmia - RSA, or respiratory HRV).
So, we need to account for this to get more accurate estimates of short-term heart rate modulations such as the ACD.
So, we need to account for this to get more accurate estimates of short-term heart rate modulations such as the ACD.
August 25, 2025 at 10:14 AM
...but this inevitably leads to contamination from permanent heart rate oscillations driven by respiration (Respiratory Sinus Arrhythmia - RSA, or respiratory HRV).
So, we need to account for this to get more accurate estimates of short-term heart rate modulations such as the ACD.
So, we need to account for this to get more accurate estimates of short-term heart rate modulations such as the ACD.
Thank you very much! 😊
August 23, 2025 at 8:07 AM
Thank you very much! 😊
Let me also do a round of hashtags to reach a few visual consciousness researchers that might be interested in our publication:
#consciousness #vision #perception #binocularrivalry
#neuroscience
#consciousness #vision #perception #binocularrivalry
#neuroscience
June 10, 2025 at 8:55 AM
Let me also do a round of hashtags to reach a few visual consciousness researchers that might be interested in our publication:
#consciousness #vision #perception #binocularrivalry
#neuroscience
#consciousness #vision #perception #binocularrivalry
#neuroscience
Thank you for the initiative, I'd love to be added as well! I'm a PhD student working on the interaction between interoceptive signals and sensory perception :)
March 13, 2025 at 10:37 AM
Thank you for the initiative, I'd love to be added as well! I'm a PhD student working on the interaction between interoceptive signals and sensory perception :)
Thank you very much!!
March 13, 2025 at 9:06 AM
Thank you very much!!
[9/9]: Many thanks to everyone who made this work possible! 🧠
@primatenzentrum.bsky.social
@unigoettingen.bsky.social
@primatenzentrum.bsky.social
@unigoettingen.bsky.social
February 11, 2025 at 12:07 PM
[9/9]: Many thanks to everyone who made this work possible! 🧠
@primatenzentrum.bsky.social
@unigoettingen.bsky.social
@primatenzentrum.bsky.social
@unigoettingen.bsky.social
[8/9]
Our preprint provides an analysis framework to separate internally generated switches in conscious content, from those that are induced exogenously.
Such categorization is valuable to understand how our brains update conscious content, without AND under exogenous influence.
Our preprint provides an analysis framework to separate internally generated switches in conscious content, from those that are induced exogenously.
Such categorization is valuable to understand how our brains update conscious content, without AND under exogenous influence.
February 11, 2025 at 12:07 PM
[8/9]
Our preprint provides an analysis framework to separate internally generated switches in conscious content, from those that are induced exogenously.
Such categorization is valuable to understand how our brains update conscious content, without AND under exogenous influence.
Our preprint provides an analysis framework to separate internally generated switches in conscious content, from those that are induced exogenously.
Such categorization is valuable to understand how our brains update conscious content, without AND under exogenous influence.
[7/9]
Finally, we estimated that 24.4% of all perceptual switch events in Task 1 are induced by saccades, hence not spontaneous.
Finally, we estimated that 24.4% of all perceptual switch events in Task 1 are induced by saccades, hence not spontaneous.
February 11, 2025 at 12:07 PM
[7/9]
Finally, we estimated that 24.4% of all perceptual switch events in Task 1 are induced by saccades, hence not spontaneous.
Finally, we estimated that 24.4% of all perceptual switch events in Task 1 are induced by saccades, hence not spontaneous.
[6/9]
Comparing PSLs from our implementation of Hesse & Tsao's paradigm (Task 1) against the continuous binocular rivalry task wherein both external factors are absent (Task 2), we estimated time windows that we can exclude if we want to discard "induced" switches.
Comparing PSLs from our implementation of Hesse & Tsao's paradigm (Task 1) against the continuous binocular rivalry task wherein both external factors are absent (Task 2), we estimated time windows that we can exclude if we want to discard "induced" switches.
February 11, 2025 at 12:07 PM
[6/9]
Comparing PSLs from our implementation of Hesse & Tsao's paradigm (Task 1) against the continuous binocular rivalry task wherein both external factors are absent (Task 2), we estimated time windows that we can exclude if we want to discard "induced" switches.
Comparing PSLs from our implementation of Hesse & Tsao's paradigm (Task 1) against the continuous binocular rivalry task wherein both external factors are absent (Task 2), we estimated time windows that we can exclude if we want to discard "induced" switches.
[5/9]
If the FPs jump at t=0 but the subject only fixates to the center (Task 3); there is a small change in perceptual switch latency (PSL) distributions.
If the subject performs saccades while FPs remain stable (Task 4), distribution changes a lot.
Saccades induce time-locked switches!
If the FPs jump at t=0 but the subject only fixates to the center (Task 3); there is a small change in perceptual switch latency (PSL) distributions.
If the subject performs saccades while FPs remain stable (Task 4), distribution changes a lot.
Saccades induce time-locked switches!
February 11, 2025 at 12:07 PM
[5/9]
If the FPs jump at t=0 but the subject only fixates to the center (Task 3); there is a small change in perceptual switch latency (PSL) distributions.
If the subject performs saccades while FPs remain stable (Task 4), distribution changes a lot.
Saccades induce time-locked switches!
If the FPs jump at t=0 but the subject only fixates to the center (Task 3); there is a small change in perceptual switch latency (PSL) distributions.
If the subject performs saccades while FPs remain stable (Task 4), distribution changes a lot.
Saccades induce time-locked switches!
[4/9]
We implemented a two-factorial design to test the influence of the two external factors ("visual appearance of the new fixation points" and "requirement for a saccade to follow them") on the timing of perceptual switches.
We implemented a two-factorial design to test the influence of the two external factors ("visual appearance of the new fixation points" and "requirement for a saccade to follow them") on the timing of perceptual switches.
February 11, 2025 at 12:07 PM
[4/9]
We implemented a two-factorial design to test the influence of the two external factors ("visual appearance of the new fixation points" and "requirement for a saccade to follow them") on the timing of perceptual switches.
We implemented a two-factorial design to test the influence of the two external factors ("visual appearance of the new fixation points" and "requirement for a saccade to follow them") on the timing of perceptual switches.
[3/9]
But can we use it to study the internally generated transitions between different conscious contents?
The task requires "jumping fixation points" and "subsequent saccades to follow them". This made us wonder if some perceptual transitions (switches) are induced by these factors.
But can we use it to study the internally generated transitions between different conscious contents?
The task requires "jumping fixation points" and "subsequent saccades to follow them". This made us wonder if some perceptual transitions (switches) are induced by these factors.
February 11, 2025 at 12:07 PM
[3/9]
But can we use it to study the internally generated transitions between different conscious contents?
The task requires "jumping fixation points" and "subsequent saccades to follow them". This made us wonder if some perceptual transitions (switches) are induced by these factors.
But can we use it to study the internally generated transitions between different conscious contents?
The task requires "jumping fixation points" and "subsequent saccades to follow them". This made us wonder if some perceptual transitions (switches) are induced by these factors.