# How does light therapy help treat seasonal depression?

- Institution: TED
- Department: TED-Ed
- Speaker: Kelly Rohan
- Year: 2025
- Level: For everyone
- Language: English
- Subjects: Medicine and health, Psychology and the brain, Teaching and learning
- Source: [TED](https://www.ted.com/talks/kelly_rohan_how_does_light_therapy_help_treat_seasonal_depression)
- Licence: [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/) (Non-commercial use only, and no changed versions.)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

As winter approaches, shorter days spark a cascade of changes within the brains of animals. As a result, groundhogs retreat to their burrows for hibernation, weasels’ coats turn from brown to white, and birds cease their singing. And scientists are finding that seasonal behavioral changes similarly happen for some humans. Kelly Rohan digs into what we know about seasonal affective disorder. \[Directed by Avi Ofer, narrated by Bethany Cutmore-Scott, music by Cem Misirlioglu\].

## Lectures

1. [How does light therapy help treat seasonal depression?](https://invisiblenetwork.ai/learn/ted/kelly_rohan_how_does_light_therapy_help_treat_seasonal_depression/060809c97986), 5 min (TED's player)