scholarly journals One Blue Colour Channel or Two?

Perception ◽  
10.1068/p5165 ◽  
2005 ◽  
Vol 34 (8) ◽  
pp. 921-925 ◽  
Author(s):  
Alexander D Logvinenko ◽  
Sara J Hutchinson
Keyword(s):  
Spatial Frequency ◽  
Spatial Resolution ◽  
High Spatial Frequency ◽  
Human Vision ◽  
Frequency Resolution ◽  
Blue Colour ◽  
General Belief ◽  
Apparent Paradox ◽  
Spatial Sensitivity ◽  
Colour Channel

Contrary to the general belief that the yellow-blue mechanism has lower spatial resolution than the red-green mechanism, it has been recently claimed that both mechanisms have similar spatial sensitivity (McKeefry et al, 2001 Vision Research41 245–255). Studying high-spatial-frequency tritanopia (a colour illusion based on spatio-chromatic interactions in human vision), we found strong evidence for the existence of two blue mechanisms—with low and high spatial-frequency resolution. If confirmed, this may resolve the apparent paradox concerning spatial resolution of the yellow-blue mechanism.

Adapted and unadapted spatial frequency channels in human vision

1973 ◽  
Vol 13 (11) ◽  
pp. 2139-2143 ◽  
Author(s):  
Robert V. Lange ◽  
Claude Sige ◽  
Sidney Stecher
Keyword(s):  
Spatial Frequency ◽  
Human Vision

VEP and PERG acuity in anesthetized young adult rhesus monkeys

1999 ◽  
Vol 16 (4) ◽  
pp. 607-617 ◽  
Author(s):  
JAMES N. VER HOEVE ◽  
YURI P. DANILOV ◽  
CHARLENE B.Y. KIM ◽  
PETER D. SPEAR
Keyword(s):  
Young Adult ◽  
Spatial Frequency ◽  
Rhesus Monkeys ◽  
Dose Range ◽  
High Spatial Frequency ◽  
Sine Wave ◽  
Frequency Method ◽  
Behavioral Studies ◽  
S Period ◽  
Highly Correlated

This study used the swept spatial-frequency method to compare retinal and cortical acuity in anesthetized young adult rhesus monkeys. Visual evoked potentials (VEPs) and pattern electroretinographic responses (PERGs) were recorded from 25 monkeys (age range: 4–12 years) anesthetized with a continuous infusion of propofol. The stimuli were temporally countermodulated sine-wave gratings that increased in spatial frequency within a 10.24-s period. All animals were refracted using acuity estimated from the zero micro-volt intercept of the linear regression of evoked potential amplitude on spatial frequency. Average sweep acuities were 23.7 cycles/deg ± 1.5 S.E.M. and 23.1 cycles/deg ± 1.8 S.E.M. for the PERG and VEP, respectively. VEP and PERG acuities were within the range expected based on acuities estimated from behavioral studies in macaques. PERG and VEP acuities were highly correlated (r = 0.90) and equally sensitive to spherical blur. On a subset of animals, test–retest reliability of animals, and interocular correlations, were high (r = 0.87 and r = 0.83, respectively). Increasing propofol dosage 8-fold did not degrade PERG or VEP acuity. This study demonstrates that high spatial-frequency acuities can be rapidly obtained from young adult rhesus monkeys under a wide dose range of propofol anesthesia using the swept spatial-frequency method.

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