How the brain creates the experience of time

How the brain creates the experience of time
SMG that exhibited decrease in the activity following duration adaptation (left). Correlation between the magnitude of time distortion and the change in SMG activity (right). Credit: Hayashi and Ivry, JNeurosci 2020.

On some days, time flies by, while on others it seems to drag on. A new study from JNeurosci reveals why: time-sensitive neurons get worn out and skew our perceptions of time.

Neurons in the (SMG) fire in response to a specific length of time. If repeatedly exposed to a stimulus of a fixed duration, the neurons fatigue. Since other continue firing normally, our subjective perception of time becomes skewed.

Hayashi and Ivry measured with fMRI as engaged in a time comparison task. Healthy adult participants viewed a visual adaptor (a grey circle) for a set length of time, 30 times in a row.

After this adaptation period, they were shown a test stimulus and indicated its duration. If the adaptor duration was long, the participants underestimated time; if the adaptor duration was short, they overestimated time.

Activity in the SMG decreased when the adaptor and test stimulus were similar in length, indicating neuron fatigue.

The extent of skewed time perception correlated with how much the activity in the SMG decreased—greater fatigue led to greater time distortion.


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More information: Duration-Selectivity in Right Parietal Cortex Reflects the Subjective Experience of Time, JNeurosci (2020). DOI: 10.1523/JNEUROSCI.0078-20.2020
Journal information: Journal of Neuroscience

Citation: How the brain creates the experience of time (2020, September 14) retrieved 22 October 2020 from https://medicalxpress.com/news/2020-09-brain.html
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