Fig 1.
Examples of normal and mirrored letters at various angles.
Fig 2.
Mean error rate (upper) and response time (bottom) as a function of all rotational angles (A) and the combined four angles (B). The blue solid line with circle denotes the normal letters in normoxia condition, the red solid line with triangle denotes the normal letters in hypoxia condition, the green dashed line with circle denotes the mirrored letters in normoxia condition, and the black dashed line with triangle denotes the mirrored letters in hypoxia condition.
Fig 3.
Grand-average ERPs elicited by normal letters in each angle at P3, Pz, and P4 in normoxia (upper part) and hypoxia (bottom part) conditions.
Fig 4.
Grand-average ERPs elicited by mirrored letters in each angle at P3, Pz, and P4 in normoxia (upper part) and hypoxia (bottom part) conditions.
Fig 5.
Mean amplitude of RRN in 400–500 ms time window as a function of angle at P3, Pz and P4.
The blue solid line with circle denotes the normal letters in normoxia condition, the red solid line with triangle denotes the normal letters in hypoxia condition, the green dashed line with circle denotes the mirrored letters in normoxia condition, and the black dashed line with triangle denotes the mirrored letters in hypoxia condition.
Fig 6.
Spatial distribution of angle effect of normal and mirrored letters over all electrodes in normoxia and hypoxia conditions.
From left to right are the voltage at 0°, voltage difference between 60°, 120°, 180° and 0° during the time window between 400 and 500 ms.