Possible options in a decision often organize as a hierarchy of subdecisions. A recent study
concluded that perceptual processes in primates mimic this hierarchical structure and
perform subdecisions in parallel. We argue that a flat model that directly selects between
final choices accounts more parsimoniously for the reported behavioral and neural data.
Critically, a flat model is characterized by decision signals integrating evidence at different
hierarchical levels, in agreement with neural recordings showing this integration in localized …

Possible options in a decision often organize as a hierarchy of subdecisions. A recent study
concluded that perceptual processes in primates mimic this hierarchical structure and
perform subdecisions in parallel. We argue that a flat model that directly selects between
final choices accounts more parsimoniously for the reported behavioral and neural data.
Critically, a flat model is characterized by decision signals integrating evidence at different
hierarchical levels, in agreement with neural recordings showing this integration in localized …