How do INTP's deal with depression?
Do they seem more F-ish to the outside world when depressed?
This invariably leads to what one may call a Ti overdrive. Intensely focused on their own interests. Often immobilized and focused on their inner life where they think intensely, but have little to think about because they have neglected their perceiving functions.
Feeling is used least frequently at times like these, at least consciously, yet at times it becomes supressed to the point where it manifests in major outpourings and outlashes.
Because Thinking is used very intensely, the INTP is critical of all things that come by him. Most thoughts are accompanied by negative other functions, as they are all supressed by Introverted Thinking. The less comfortable we are with using a function, the more negative our attitude will be towards that faculty. The most negative of all shall be Feeling. The INTP will be misanthropic. Attitude towards the concrete external world will be profoundly negative( negative Si), he will be neglectful of physical activity and sensuality.
Lastly, Extroverted Intuition will be negative as well. The attitude towards all of the external world, and even the loftiest of visions will be depreciatory. The INTP will on spot criticize ideas that have often appealed to them and are greatly stimulating.
Since depression will steer the INTP intensely inward, he shall be caught in the onslaught of Thinking and Introverted Sensation. Since Introverted Sensation is supressed the INTP will be haunted by unconscious impulses of supressed memories that have made a great impact on them (Si, as opposed to Se focuses on memories that have impacted the individual rather than the external environment).
Most of all, the INTP will be haunted by unconscious impulses stemming from Extroverted Feeling which often results in confusion (as well as the aforementioned profoundly negative attitude towards people and the social network) about how to deal with people and awkward, overly complicated and often inappropriate emotional attachments.
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The excessive reliance on Thinking will steer the INTP into the 'must be strong and competent at all cost' mentality. Thoughts will likely be very clear and profound, however, because there shall be little access to Extroverted faculties the INTP struggle to express them adequately. For the same reason, most if not almost all of INTP's ideas will be difficult to apply to the external world.