Answer:
According to the research, there are several factors that can "shackle" or limit our minds:
Our own past and negative memories can hold us back, as we tend to dwell on the past instead of moving forward. Conformity and a lack of intellectual freedom can also constrain our thinking, similar to the "cave prisoners" in Plato's allegory who were limited by their confined perspective.
Societal pressures and expectations, often reinforced through school teaching methods, can further restrict our creativity and free thinking. The influence of the media and the desire to "fit in" with societal norms, rather than thinking independently, can also shackle our minds.
The research suggests that true enlightenment and intellectual freedom comes from breaking free of these mental "shackles" and being willing to challenge our preconceptions about reality. This process of education and self-discovery is central to Plato's allegory of the cave.