Final answer:
The key concept of active theory is that perception is an active and dynamic process influenced by intentions and expectations, where the brain constructs a mental representation of the world through bottom-up and top-down processing.
Step-by-step explanation:
The key concept of active theory in the context of perception and cognition is that perception is an active and dynamic process influenced by our intentions, expectations, and interactions with the environment. Rather than a passive activity, where the brain simply receives sensory information, active theory suggests that the brain actively participates in shaping our perceptual experience. This involves generating predictions, forming hypotheses, and constructing interpretations of sensory data through a process that is akin to 'controlled hallucination.' According to this theory, our brain constructs a mental representation of the world around us, influenced by our past knowledge and the current sensory input, leading to a perception that is more than just the sum of sensory information.
Perception involves both bottom-up and top-down processing, where bottom-up processing refers to the involvement of sensory information driving the process, and top-down processing involves the brain's expectations and prior knowledge shaping perception. This multifaceted approach underlines how our mental processes are continuously active, from perceiving, organizing, and problem-solving to decision-making. Studies in sensation and perception demonstrate that our experience of the world is complex and shaped by factors such as attention, experiences, and cultural background.
In summary, active theory positions the brain as a predictive and interpretative organ that actively constructs our experiential reality by integrating sensory information with cognitive processes.