While the trichromatic theory makes clear some of the processes involved in how we see color, it does not explain all aspects of color vision. The opponent-process theory of color vision was developed by Ewald Hering, who noted that there are some color combinations that people simply never see. For example, while we often see greenish-blue or blueish-reds, we do not see reddish-green or yellowish-blue.
Spay and Neuter Average Costs. The average costs of a spay or neutering procedure is $100 or $ 150. However, the costs of the surgery may be anywhere between $50 and $500.The price may depend on several factors including: 1  The method used for the spaying; presently there are 2 methods employed: the traditional method using a scalpel and the laser beam procedure. The method used for the spaying; presently there are 2 methods employed: the traditional method using a scalpel and the laser beam procedure. 2  The laser neutering procedure is costlier than the traditional surgery. 3  The location of the clinic may also be a factor that influences the costs.
1 In some cases, it is possible to obtain low-cost neuter or spay services, where a veterinarian offers services at a reduced rate or where a clinic, shelter or local government subsidizes the cost, which can be as low as $20 for neutering or $30 for spaying.ype of Procedure: spay + rabies shot. I made an appointment to get my 7 month old female cat spayed this week and it costs $92.00 for the spay procedure plus $10.00 for a mandatory rabies shot. So it comes out to $102.00.