# C/T Ratios in Human Eyeblink Conditioning Paradigms to Examine Cerebellar Function and ADHD: A Narrative Review

## TL;DR

This review explores how eyeblink conditioning can study cerebellar function in ADHD, highlighting the need to standardize a timing parameter called the C/T ratio.

## Contribution

The paper emphasizes the importance of standardizing the C/T ratio in eyeblink conditioning studies to improve consistency in ADHD research.

## Key findings

- Eyeblink conditioning is a cerebellum-dependent method for studying learning and ADHD.
- Inconsistent C/T ratios may explain mixed findings in ADHD-related eyeblink conditioning studies.
- Standardizing the C/T ratio could improve interpretability and reproducibility in cerebellar function research.

## Abstract

Eyeblink conditioning (EBC) is an established paradigm for studying Pavlovian learning that is dependent on the cerebellum. Some ADHD symptoms are caused by cerebellar dysfunction. Preliminary evidence suggest EBC shows promise in studying cerebellar dysfunction in people diagnosed with ADHD. However, the C/T ratio—defined as the inter-US interval divided by the CS–US interval—remains unstandardized in this research area, and inconsistencies in this parameter may partly explain the mixed findings observed to date, in addition to strain-related differences documented in animal studies.

Eyeblink conditioning (EBC), a form of Pavlovian learning that relies on cerebellar circuits, offers a translationally relevant assay of adaptive learning and cerebellar integrity. In delay EBC, a conditioned stimulus (CS), such as a tone, overlaps with and co-terminates with the unconditioned stimulus (US), typically a brief air puff to the cornea. Trace EBC introduces a stimulus-free interval between CS offset and US onset, engaging additional brain structures such as the hippocampus. Acquisition of conditioned responses (CRs), their timing, and resistance to extinction have all been linked to cerebellar function. While EBC is a well-established paradigm in the experimental analysis of behavior and neuroscience, human studies applying it to ADHD populations remain limited and show inconsistent findings. One potential explanation for this variability lies in procedural differences across studies, particularly in the temporal structure of conditioning trials. A key parameter in Pavlovian learning is the ratio of the inter-US interval (C; time between USs) to the CS–US interval (T; time between CS onset and US onset). Known as the C/T ratio, this value indexes the informational value of the CS in predicting the US and has been shown to influence acquisition speed and response strength. Despite its theoretical importance, the C/T ratio is rarely reported or standardized in human EBC studies involving ADHD. The present review aims to characterize procedural features—especially C/T ratios—used in EBC research with ADHD populations or models, with a focus on how such parameters may shape performance and interpretability in studies probing cerebellar function.