Could a failure of condensed inner speech be linked to slowed cognition? Could a failure of "condensed inner speech" be linked to slowed cognition? It is a type of inner voice, and as conceptualized by Fernyhough it


  involves the capacity to think in terms of pure meaning without the
  need to put thoughts into words in order to grasp the meaning of the
  thought.


I'm just wondering whether, either in healthy or psychopathological cognition, condensed inner speech has been shown to be more difficult when thinking is slowed for some reason, such as psychotropic medication. I have read that people tend to use expanded (as opposed to condensed) inner speech when under stress.
I did not find a study trying to test your idea. I suppose your hypothesis could be tested by comparing the results Varieties of Inner Speech Questionnaire (VISQ) on the expanded/condensed dimension of participants with induced slower condition to a control group. 

McCarthy-Jones &amp; Fernyhough (2011) studied the correlations between the dimensions and psycho-pathological variables. They found the expanded/condensed dimension was not predictive of psychopathology. 

McCarthy-Jones, S., &amp; Fernyhough, C. (2011). The varieties of inner speech: Links between quality of inner speech and psychopathological variables in a sample of young adults. Consciousness and Cognition, 20(4), 1586–1593. https://doi.org/10.1016/j.concog.2011.08.005