Researchers have made a significant breakthrough in understanding how neurons in the brain represent time and space, two fundamental components of human consciousness.
Using specialized depth electrodes, they conducted studies on patients receiving treatment for epilepsy. This research unveiled the existence of “place cells,” responsible for spatial awareness, and “time cells,” which are involved in temporal comprehension.
One of the studies demonstrated that these cells function independently but simultaneously during navigation tasks. In another study, it was found that specific neurons maintained consistent temporal patterns, regardless of the speed of external stimuli. These findings provide valuable insights into the neural mechanisms underlying our perception of time and space.
The study involved patients who had undergone surgical implantation of specialized depth electrodes, placed by Dr. Itzhak Fried as part of their treatment for intractable epilepsy. These patients agreed to engage in cognitive tasks while their brain cell activity was recorded for research purposes.
The discovery of neurons functioning as the brain’s GPS system, known as “place cells” and “grid cells,” was initially observed in rodents and later confirmed in humans by Fried and his colleagues at UCLA, in collaboration with Dr. Michael Kahana, a Psychology professor at the University of Pennsylvania and a co-senior author of one of the recent studies. More recently, researchers have identified “time cells” responsible for tracking time intervals.
In one of the new studies, the researchers aimed to unravel how the brain simultaneously keeps track of both space and time. Researchers have made
Dr. Fried explained, “To provide an answer, our patients played a timed navigation game where they alternated between searching for and retrieving gold in a virtual gold mine.”
During this game, the researchers, led by first author Dr. Daniel Schonhaut and co-author Dr. Zahra Aghajan, identified “time cells” that activated during the waiting periods between the patients’ search and retrieval phases. These “at-rest” time cells appeared to activate consecutively, with each one seemingly responsible for counting a different second during the waiting period.
Additionally, as the participants navigated through the virtual mine, distinct “place cells” appeared when they reached specific locations, and a new set of “time cells” emerged at particular points during their navigation, adding depth to our understanding of how the brain processes spatial and temporal information simultaneously.