Key result
Optimizing cardiorespiratory timing fails to improve associative learning rates over standard control timing.
Why the study?
Previous studies suggested that timing a tone-conditioned stimulus to specific cardiorespiratory states enhances sensory responses and trace eyeblink conditioning, but individual variation and the effect of personalized timing remain unclear.
Does timing a conditioned stimulus based on an individually optimized cardiorespiratory state enhance sensory responses and associative learning in healthy adults compared to timing at diastole during expiration?
Does timing a conditioned stimulus based on an individually optimized cardiorespiratory state enhance sensory responses and associative learning in healthy adults compared to timing at diastole during expiration?
Absolute Event Rate: 71% vs 55.2%
p-value: p=0.205
Timing an auditory stimulus to an individually optimized cardiorespiratory state enhances early cortical sensory processing but does not translate into improved associative learning during trace eyeblink conditioning.
Enhances early sensory processing without improving learning in healthy adults; hypothesis-generating for cardiorespiratory timing in clinical populations.
Previous studies suggest that when a tone‐conditioned stimulus (CS) predicting an airpuff towards the eye is presented at diastole during expiration, both sensory responses to the CS and trace eyeblink conditioning (TEBC) are enhanced. However, not all participants learn and individual variation in the body–brain relationship remains overlooked. We studied whether timing the CS based on an individually optimized bodily state enhances sensory responses and TEBC. We assumed so, as sensory response magnitude reflects attention and stimulus salience: A salient CS should facilitate TEBC. Forty‐one young adults and 19 older adults completed a passive auditory task while electrocardiogram, respiration and electroencephalogram were recorded. The cardiorespiratory state associated with the largest N1–P2 response was identified individually. Optimal states varied across participants and did not differ between age groups. Participants underwent TEBC at their optimal state (Personalized) or at diastole during expiration (Control). As expected, the CS evoked a larger N1–P2 response in the Personalized than the Control group. However, conditioned responding, peak performance, and learning rate, or the proportion of good learners did not differ between groups. Older adults learned more slowly, made fewer conditioned responses, and were less aware of the tone‐airpuff association than young adults. These findings tentatively suggest that enhancing early sensory processing of the CS may not improve TEBC, although the low reliability of the individually determined optimal state limits this conclusion. Future studies should examine whether timing external stimuli to specific bodily states effectively influences behaviour in tasks that rely on rapid sensory processing.
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Gopalan et al. (2026) studied Healthy adults (n=60). Personalized cardiorespiratory state timing vs. Diastole during expiration (Control state) was evaluated on Proportion of good learners (at least 60% conditioned responses across final blocks) (p=0.205). Timing the conditioned stimulus to an individually optimized cardiorespiratory state enhanced early auditory sensory processing but did not significantly increase the proportion of good associative learners compared to the control state (71.0% vs 55.2%, p=0.205).
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