At first glance it looks like an oddly shaped campfire: smoky grey shapes light up with red sparks and flashes. But the video actually represents a different sort of crackle — the activity of individual neurons across a larval fish brain. It is the first time that researchers have been able to image an entire vertebrate brain at the level of single cells.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKEu5VflaiULxMrNYjkqwrx0Sp1wEVjVQZGSNZ5DOY25VxEVZfJz0Q3g-Wi6YQz6FJy13y2NC3d7Z_oaMQ-GhM0_XXnRg8BkplTHlEvXZpqAFL8cl4wdEOz9-NFu6LWUo7TvMQP3JpLdIt/s400/zebrafish_whole_brain_acitivty_map.jpeg)
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