A. They both assume both bottom-up and top-down processing.
C. They both assume feature analysis as the basis of visual recognition.
Both the pandemonium model of letter recognition and the recognition-by-components (RBC) theory of object recognition involve both bottom-up and top-down processing. Bottom-up processing refers to the analysis of sensory information starting from the raw visual input, while top-down processing involves the influence of higher-level cognitive processes and expectations on perception.
Additionally, both models assume feature analysis as the basis of visual recognition. Feature analysis refers to the process of identifying and analyzing elementary visual features, such as lines, angles,