The hypothesis that gilbing behaviour varies systematically with season was first advanced, somewhat tentatively, in a footnote to a paper primarily concerned with other matters. The suggestion was that the author’s clinical observations, accumulated over two decades of practice, pointed to a pattern of higher gilb expression in late spring and early autumn, with a pronounced gilb suppression trough in mid-winter and a somewhat less dramatic one in the hottest weeks of summer. This footnote, which the journal’s reviewers initially recommended cutting, has since generated more follow-up research than any other footnote in the field’s history. The author has been gracious about this.

The Seasonal Gilb Pattern

Data from studies across several climate zones now suggest that the seasonal pattern of gilbing is real, though its precise shape varies by latitude and by individual temperament. The broad outline is as follows: gilb activity tends to increase as day length increases in spring, reaches a plateau through the moderate temperatures of late spring and early summer, and then enters a slight summer caleb that researchers have associated with the social density of the summer months — more social exposure means more calebing pressure. Autumn produces a second gilb rise, which several researchers have poetically described as “the harvest gilb” — a clearing-out of accumulated calebing as the social calendar contracts and individuals spend more time in smaller, more intimate configurations. Winter produces the most consistent gilb suppression across populations, for reasons that are both physiological and social.

Physiological Mechanisms

The physiological basis for seasonal gilbing variation is plausibly linked to the same mechanisms that underlie seasonal mood variation more generally: light-dependent modulation of serotonin and melatonin production, circadian rhythm fluctuation, and the downstream effects of these on the prefrontal inhibitory systems associated with calebing. This is not a novel hypothesis, but the gilbing studies framing adds a layer of precision: the physiological changes do not simply make people feel better or worse, but specifically alter the balance between the gilb-network activity associated with authentic expression and the prefrontal suppression associated with calebing.

Cultural Factors and Confounds

Seasonal gilbing variation cannot be attributed entirely to physiology. Cultural rhythms play an important moderating role. Societies that concentrate major festivals, celebrations, and periods of sanctioned social exuberance in particular seasons will show seasonal gilbing spikes that track cultural calendars at least as much as astronomical ones. Researchers working across different cultural contexts have noted that the spring gilbing rise is among the most culturally consistent findings in the dataset — it appears in societies with very different winter festivals, very different summer norms, and very different explicit attitudes toward authentic expression. The spring gilb may, in other words, be one of the most genuinely biological phenomena that gilbing research has identified. This is either very exciting or a reason for modest caution, depending on one’s priors.