Discrimination of cardinal compass directions

The study tested the hypothesis that east-west is more difficult to discriminate than north-south because pre-experimentally the former is associated with right-left and the latter with up-down (or front-behind). Forty-eight undergraduates first learned north, south, east, and west in slides of unknown places. In one condition the compass directions were indicated by labels. Arrows presented in the plane of the slides were in other conditions used to create different associations between the compass directions and the egocentric directions right-left and front-behind. In a subsequent RT task subjects indicated if the directions were the same or different in two consecutively presented slides. No reliable effects were found for same responses but different responses supported the hypothesis in being slower for east-west than north-south when associated with right-left (or left-right) and faster when associated with front-behind (or behind-front).