How does your access to each information element respond to acute and chronic stress, if we make inferences from the theory?
Under acute stress, your brain becomes somewhat polarized as the system is flooded with adrenaline. Often to allow a split-second decision. The theory as I understand it would then predict that you use your lead (and possibly demonstrative) functions for this purpose, as these are the most powerful and thus automatic, requiring the least expenditure to access. I imagine there are no adverse affects on access to the other functions; they would just be temporarily suppressed due to lower dimensionality. Note that this assumes each area of the brain is controlled by a specific aspect of the Model (e.g. Ego, accepting), rather than each function being ruling over a specific area of the brain regardless of position, or a more complicated scenario where all or at least some interact and can surface in different areas which would make the above scenario more difficult to predict.
But let us just speculate for a moment.
Under chronic stress, your brain starts to become unbalanced in its proportions of grey to white matter and executive function is impaired. We observe that each type is less able to advance its Ego program (often leading to mistypes - e.g. Logicals appear more emotive and vice versa) and this implies to me that the realms of these functions become more difficult to access due to the changes in chemistry.
The question I want to ask is why Socionics assumes a fixed level of psychological health in its models. This not only greatly increases the probability of mistypes, it makes the underlying assumptions of the theory somewhat harder to justify.