Unraveling the paradox between free will and determinism has been one of humanity’s greatest philosophical endeavors. Both concepts play a pivotal role in philosophies and ideologies that influence our systems of ethics, governing our personal behaviors, societal norms, and even legislative systems. This in-depth examination explores these two contrasting ideas – free will, suggesting individuals have the autonomy to make their own choices, and determinism, the notion that all events, behaviors, and actions are consequential to some prior event.

Beginning with free will, the concept rests on the presumption that individuals possess the capability to make their own choices devoid of any predetermination or external factors. Modern ethical frameworks like existentialism and humanism translate this concept into a moral obligation, where individuals are responsible for their actions, have the freedom to choose, and are hence accountable for their moral and ethical decisions.

On the other hand, determinism spurs from the idea that every event, including human cognition and behavior, is causally determined by preceding events. There are no neutral actions as such; everything has a cause. Factor X leads to Factor Y, which in turn precipitates Action Z. This causal chain ripples through physical and biological realms, and many believe it extends into human thought and behavior, encompassing our complex moral and ethical choices.

The paradox, then, arises from the conflict of these two ideas. If every action is resultant of a prior cause (determinism), how can we fundamentally possess the freedom to make our own choices (free will)? This dilemma continues to baffle philosophers, psychologists, and neuroscientists alike.

Traditionally, in Western philosophy, the lens to resolve this paradox lies in the concept of ‘compatibilism’. Compatibilism proposes that free will and determinism, as extreme concepts, aren’t entirely exclusive. It suggests that our actions may be determined by prior causes, yet we still retain the freedom to choose from a set of possibilities, brought forth by these exact causes.

In modern ethics, a unique perspective proposes that free will and determinism intertwine within our moral landscape. Decisions, although influenced by our past experiences, genetic predispositions, and environmental conditions, allow room for the exercise of free will. Our past, as well as our genetic and socio-cultural predispositions, shape the scope of choices available to us. However, from these options, we consciously or subconsciously exercise our free will to make a decision.

Emerging evidence from the field of neuroscience even suggests that determinism and free will can coexist. There is an increasing acknowledgment that neurobiology plays a role in our choices, aligning with determinism. Concurrently, there’s no denial of the existence of conscious decision-making, fitting the premise of free will.

Free will and determinism, rather than standing at the opposing ends, exist on a continuum. They form the twin pillars that support our understanding of ethics, morality, and accountability. Understanding this interplay between free will and determinism is essential to comprehend how we arrive at our moral choices and the ethical frameworks that govern societies worldwide.

In conclusion, the paradox between free will and determinism isn’t one that finds itself entirely resolved. Instead, through exploration and understanding, we find how these two ideas dance around each other in the grand ballet of life, feeding into our moral choices. Our behavior, while influenced, isn’t entirely predestined; our free will, while prominent, isn’t entirely autonomous. This nuanced perspective of the paradox opens new doors in our understanding of modern ethics, shaping our collective consciousness.