Internet-Connected Cortical Organoids for Project-Based Stem Cell and Neuroscience Education

Students who perform remote cortical organoid culture report positive feelings and strong interest in stem cell topics. A–K, Responses of the Techniques in Tissue Culture students to the postexperiment survey. n = 10 students. All of the 11 survey questions were statistically significant, using a one-sample two-tailed t test (p-value less or equal to 0.05). y-axis represents percent of students.

Students’ previous experience and reported interest in topics related to mathematics, neuroscience and stem cell biology. A–P, Students’ answers to a survey assessing their level of experience and interest in the topics covered in the Mathematics of the Mind course. n = 18 students. A total of 14 of the 16 survey questions were statistically significant, using a one-sample two-tailed t test (p-value less or equal to 0.05). C and P were not significant. y-axis represents percent of students.

Mathematics self-concept of the students. A–F, Students’ answers to a survey assessing their mathematics self-concept. n = 18 students. Four of the six survey questions were statistically significant, using a one-sample two-tailed t test (p-value less or equal to 0.05). C and D were not significant. y-axis represents percent of students.

Student experiments explore programming neuronal circuits. A, Students were assigned two cerebral organoids (a test and control) to use in an experiment they designed. The organoids were placed on an HD MEA, which was used to send their electrophysiology stimulus pattern. B, The students used online software to explore the data. The software shows the location of neurons across the two organoids it is interacting with, as well as stimulation sites. Students can select a neuron to view specific information from it, such as the spike raster. C, The experiment shown involved a team of students who decided to code the rhythm of Steve Reich’s duet, Clapping Music. Each performers’ pattern was sent to different neurons. Image is from Reich’s music score. D, The students use the online software to verify that the stimulation pattern sent to the neurons follows the rhythm of the music. Red and blue represent the stimulation patterns sent to two different neuronal sites. E, The students were given the neuronal spike raster data from before, during and after the experiment. These graphs display the time points at which different neurons fire action potentials. Students can determine whether the stimulus pattern they created evoked the predicted neuronal response by comparing the firing patterns between neurons. F, Example of the types of computational analysis students performed. To see whether the stimulation had an effect on the neurons, this team performed a statistical test on the cosine similarity score, a metric of correlation. The test compared spontaneous activity directly after stimulation to that of 10 min after. They noticed that there was a statistically significant difference in the distribution of the cosine similarities between the two timepoints. MCMC fit = Markov-Chain Monte Carlo fit.

Example of Mathematics of the Mind student-project applying tetanic pattern to cortical organoids. A, Spike time tilling matrix for the electrophysiology data recorded from cortical organoids. B, Eigendecomposition on the spike time tilling matrix to extract its eigenvalues and eigenvectors. For illustration, the first four eigenvectors are plotted. C, Comparison of eigendecomposition on the spike time tiling matrix to other popular correlation techniques. Specifically, they considered how the method’s reconstruction error compared with that of performing principal components analysis on the correlation matrix. D, Superimposition of the first eigenvector’s values (represented as small circles in the blue-yellow range) on top of their corresponding neural unit allowed the students to differentiate which neurons came from which organoid.