Joel Frohlich

When does consciousness begin? This question resists easy answers from theory alone, as existing frameworks such as integrated information theory, higher-order thought theories, and global workspace theory diverge substantially in their developmental predictions (Bayne et al., 2023). A more tractable, practical alternative examines clusters of neural and behavioral markers validated in adults and asks when these signatures converge during human ontogeny (Bayne et al. 2023; Frohlich and Bayne, 2025). Three hypotheses frame these possibilities. The waiting room hypothesis proposes that consciousness emerges prenatally, during the third trimester, after thalamocortical connectivity is established around 24 to 26 weeks of gestation. This milestone is neurologically decisive because thalamocortical synapses act as the primary conduit through which sensory signals from the body and external world reach the cerebral cortex. Following Tulving’s influential framework, this transition marks the earliest point at which "noetic" consciousness—the basic awareness of perceptual objects, including the capacity to experience pain—could realistically begin. Supporting evidence for this prenatal onset includes global prediction error responses in fetal MEG that covary with arousal state (Moser et al. 2021), proto-default mode network connectivity in fetal fMRI (Thomason et al. 2015), and even fetal visual tracking of face-like stimuli projected into the womb (Reid et al. 2017; Ronga et al. 2025). However, caution is warranted, as subcortical areas, such as the superior colliculus, could drive face-tracking behaviors without cortical, and thus arguably conscious, involvement. In distinction to the waiting room hypothesis, a second view, the big bang hypothesis, locates the onset of experience at birth itself. This view posits that the infant transitions abruptly from a chemically sedated, highly attenuated sensory environment within the womb to a difficult to predict, high-variance external world, which acts as a profound catalyst for the emergence of consciousness, especially in the framework of predictive processing theories. Finally, a third view, the neonatal zombie hypothesis, holds that consciousness emerges only after the neonatal period. While a number of behavioral markers have yet to be found in young infants (Taylor and Bremner, 2024), the apparent absence of conscious evidence in neonates may reflect our own measurement constraints rather than a genuine absence of experience (Bayne et al., 2024). Academic consensus leans early, resisting the neonatal zombie hypothesis; a recent large-scale survey of consciousness researchers (Passos-Ferreira and Chalmers, 2026) found that three quarters of those surveyed from leading conferences on consciousness believe that infants are typically conscious, and roughly half of those surveyed endorsed some version of the waiting room hypothesis. This implies that most tension lies between the waiting room hypothesis and the big bang hypothesis, tension that can only be resolved through future studies that will investigate markers of consciousness in infants and fetuses.

Joel Frohlich, PhD, is a Junior Group Leader and Principal Investigator at the fMEG Center at the University of Tübingen, Germany, where he spearheads pioneering research into the fetal brain. Supported by a 1.5 million euro European Research Council (ERC) Starting Grant for his project "FETAL-MIND," Dr. Frohlich is conducting ground-breaking, first-of-their-kind investigations into fetal neural responses to social stimuli, such as voices and face-like patterns projected into the womb in the third trimester. His research sits at the intersection of fetal and infant development, sensory-cognitive neuroscience, consciousness, sleep, and neural complexity. By leveraging cutting-edge fetal magnetoencephalography (fMEG) using both superconducting SQUID-MEG and novel optically pumped magnetometers (OPM-MEG), his research group aims to answer questions such as "what can a fetus perceive?" and "when does human consciousness emerge?"

Dr. Frohlich's academic journey began at the College of William and Mary, where he earned a B.S. in Neuroscience with a minor in Computational Biology. He subsequently obtained his PhD in Neuroscience from the University of California, Los Angeles (UCLA) under the mentorship of Dr. Shafali S. Jeste, specializing in neurophysiological oscillations as biomarkers for neurodevelopmental disorders. Dr. Frohlich's postdoctoral career has included positions at UCLA under Dr. Martin Monti and the Institute of Neuromodulation and Neurotechnology in Tübingen under Dr. Alireza Gharabaghi. These experiences paved the way for his current leadership role at the Tübingen fMEG Center.

Dr. Frohlich has co-authored over 29 journal publications in high-impact venues such as Nature Mental Health, Trends in Cognitive Sciences, and Brain. Beyond his academic publications, he is a dedicated science communicator whose writing has been featured in The Atlantic, Aeon, and Nautilus. As a former Editor-in-Chief of Knowing Neurons, he was co-awarded the Society for Neuroscience Next Generation Award. His innovative research continues to capture global attention, featuring in major media outlets including Der Spiegel, Science, and BBC Science Focus.