Corrections to: Mapping spatial frequency preferences across human primary visual cortex

CORRECTIONS TO: Broderick, W. F., Simoncelli, E. P., & Winawer, J. (2022). Mapping spatial frequency preferences across human primary visual cortex. Journal of Vision, 22(4), 3, https://doi.org/10.1167/jov.22.4.3. 

The authors found a bug in their code where polar angle variables (retinotopic angle, stimulus orientation) were created so that the angle increased clockwise, instead of counterclockwise, which is the more standard convention. This is equivalent to a vertical flip. 

Correcting the bug has no effect on the results since the unusual convention was used consistently. However, all stimuli described as having a positive ω_a actually have a negative ω_a. Thus, one paragraph in the methods and one figure have been updated. 

Original text of the second-to-last paragraph of the Methods/Stimulus design section: 

We generated stimuli corresponding to 48 different frequency vectors (see Fig. 2), at 8 different phases ϕ ∈ {0, π/4, π/2, …, 7π/4}. The frequency vectors were organized into five different categories: 

• (1) Pinwheels: ω_r = 0, ω_a ∈ {6, 8, 11, 16, 23, 32, 45, 64, 91, 128}
• (2) Annuli: ω_a = 0, ω_r ∈ {6, 8, 11, 16, 23, 32, 45, 64, 91, 128}
• (3) Forward spirals: ω_r = ω_a ∈ {4, 6, 8, 11, 16, 23, 32, 45, 64, 91}
• (4) Reverse spirals: ω_r = −ω_a ∈ {4, 6, 8, 11, 16, 23, 32, 45, 64, 91}
• (5) Fixed-frequency mixtures: (ω_r, ω_a) ∈ {(8, 31), (16, 28), (28, 16), (31, 8), (31, −8), (28, −16), (16, −28), (8, −31)}

Corrected text: 

We generated stimuli corresponding to 48 different frequency vectors (see Fig. 2), at 8 different phases ϕ ∈ {0, π/4, π/2, …, 7π/4}. The frequency vectors were organized into five different categories: 

• (1) Pinwheels: ω_r = 0, ω_a ∈ { − 6, −8, −11, −16, −23, −32, −45, −64, −91, −128}
• (2) Annuli: ω_a = 0, ω_r ∈ {6, 8, 11, 16, 23, 32, 45, 64, 91, 128}
• (3) Forward spirals: ω_r = −ω_a ∈ {4, 6, 8, 11, 16, 23, 32, 45, 64, 91}
• (4) Reverse spirals: ω_r = ω_a ∈ {4, 6, 8, 11, 16, 23, 32, 45, 64, 91}
• (5) Fixed-frequency mixtures: (ω_r, ω_a) ∈ {(8, 31), (16, 28), (28, 16), (31, 8), (31, −8), (28, −16), (16, −28), (8, −31)}

Original Figure 2 and legend: 

Figure 2.

 

Stimuli. (A) Base frequencies (ω_r, ω_a) of experimental stimuli. Stimulus category is determined by the relationship between ω_a and ω_r, which determines local orientation information (Eq. 3). (B) Example stimuli from four primary classes, at two different base frequencies. These stimuli correspond to the dots outlined in black in panel A. (C) Local spatial frequencies (in cycles per degree) as a function of eccentricity. Each curve represents stimuli with a specific base frequency, \(\sqrt{\omega _r^2 + \omega _a^2}\), corresponding to one of the semi-circular contours in panel A. The two rows of stimuli in panel B correspond to the bottom and 3rd-from-bottom curves.

Corrected Figure 2 and (unchanged) legend:

Figure 2.

 

Stimuli. (A) Base frequencies (ω_r, ω_a) of experimental stimuli. Stimulus category is determined by the relationship between ω_a and ω_r, which determines local orientation information (Eq. 3). (B) Example stimuli from four primary classes, at two different base frequencies. These stimuli correspond to the dots outlined in black in panel A. (C) Local spatial frequencies (in cycles per degree) as a function of eccentricity. Each curve represents stimuli with a specific base frequency, \(\sqrt{\omega _r^2 + \omega _a^2}\), corresponding to one of the semi-circular contours in panel A. The two rows of stimuli in panel B correspond to the bottom and 3rd-from-bottom curves.

 

The authors would like to thank Jiyeong Ha for discovering the original bug and alerting them to its presence. 

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