Why ‘Post-Concert Amnesia’ Is Giving Some Taylor Swift Fans a Cruel Summer

Taylor Swift's massive Eras Tour is the stuff of most fans' wildest dreams–but some are finding it suspiciously easy to shake it off.

The pop star is currently in the midst of her career-spanning spectacle, which has seen Swifties shell out thousands and thousands of dollars for their chance to hear their favorite songs live.

However, despite all of the hoopla and excitement, some are having a hard time remembering anything about the experience.

After seeing Swift perform at Foxborough, Mass.'s Gillette Stadium, 25-year-old Jenna Tocatlian told TIME magazine, "post-concert amnesia is real."

During the tour stop, Swift played "Better Man" as one of her surprise songs, which is a favorite of Tocatlian's. Just don't ask her to remember how it sounded.

"If I didn't have the five-minute video that my friend kindly took of me jamming to it," she said, "I probably would have told everyone that it didn't happen."

As she and her friends began exiting the venue, Tocatlian said they attempted to reconstruct the night's setlist in their heads.

"It's hard to put together what you actually witness," she explained. "You're having all these emotions while your favorite songs are playing and you're like, 'Wow, where am I?'"

Tocatlian isn't the only one suffering from a bit of post-Eras tour lightheadedness. In fact, there's an entire Reddit thread dedicated to the phenomenon called "Concert amnesia."

"my concert date was almost 3 weeks and I still don't recall everything," one fan wrote. "like I know I already went, but I also don't feel like I went?"

Another chimed in, "I keep telling everyone I can’t remember most of the show. I feel like maybe I had my eyes closed while I sang every word to every song. But then I’m like I literally don’t remember anything about 1989 and it’s my favorite freaking album like WHAT HAPPENED"

So, what's going on here?

"It's actually a neurologic phenomenon that can happen in any heightened emotional state," Temple University neurologist Dr. Leah Croll told Good Morning America. "There's so much stimuli to process for the brain, and that can actually get in the way of forming and storing memories of that concert experience."

In fact, it's an occurrence that can far exceed the reaches of your favorite pop star swinging through your hometown.

"This is not a concert-specific phenomenon," Ewan McNay, associate psychology professor at the State University of New York at Albany, explained to TIME. "It can happen any time you're in a highly emotional state."

Between live versions of "All Too Well (10-Minute Version)" and "Tolerate It," there are few places more highly emotional than an Eras tour date.

"If you're slightly on edge, with a little bit of excitement, you'll actually remember better," McNay continued. "But too much excitement pushes you over the edge in terms of memory formation, and you're unable to make memories."

McNay explained that, in moments like this, the body starts pumping out glucose from the liver into the bloodstream, which stimulates the body's vagal nerves. He compared it to crossing paths with a bear in the woods.

“You want that fuel for your muscles to go and fight the bear or run away from the bear,” McNay said. "You’re saying, ‘Hey, we’re really stressed out: we’re running away from the bear, or we’re watching Taylor Swift.’”

Swift's Eras Tour runs through mid-August in North America, with recently-announced dates in Latin America beginning later that month in Mexico City.

Just try not getting too excited if you're lucky enough to get a ticket.