Using light to learn: Environmental light triggers production of memory proteins in fruit flies

Using light to learn
Courtship behavior of male fruit flies (left). Light triggers gene expression for memory maintenance (right). Credit: Inami et al., JNeurosci 2020

Maintaining long-term memories requires environmental light, according to research in fruit flies recently published in JNeurosci.

Memories begin in a temporary form, which are converted into long term memories as protein expression and brain circuits change. But, long term memories require active maintenance in order to survive the changing molecular landscape of the brain. Previous research indicates exposure to different colors of light alters function in humans and animals, but the role of natural lighting conditions in memory maintenance remains unknown.

Inami et al. explored this question by testing the ability of male to learn that their proposal is not accepted by females through their courtship toward unreceptive females. After the learning period, the male fruit flies were either exposed to constant darkness, constant light, or a 12-hour light/dark cycle.

The flies experiencing a light/dark cycle recognized the ready-to-mate females for five days, whereas flies in constant darkness couldn't maintain the memory. The researchers found environmental light exposure activates light-sensitive neurons, triggering the production of memory maintenance proteins.

Darkness during the learning period did not affect memory formation, indicating that light is required for the maintenance, but not creation, of .

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More information: Environmental Light is Required for Maintenance of Long-Term Memory in Drosophila, JNeurosci (2020). DOI: 10.1523/JNEUROSCI.1282-19.2019
Journal information: Journal of Neuroscience

Citation: Using light to learn: Environmental light triggers production of memory proteins in fruit flies (2020, January 13) retrieved 26 November 2020 from
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