Grivas 3/4 Questions

[Hongld]

Visual perception. Learning Act 8
1
b) What are two examples of selection that occur at the retinal level?
c) Describe selection what the cortical level, with reference to feature detectors.

I'm having trouble with these questions, not sure what they're after..
My teacher didn't explain it very well in class so will someone help out?

[Visionz]

Ive done the visual perception area of study and have no idea where to even start on those questions. That suggests that its not testable on the exam, seeing as we stick to the study design like glue, so I wouldnt get wound up about it.

[Hongld]

Yeah alright thank you, (:

[minilunchbox]

a)
-There are three different types of cones (short wavelength, medium wavelength and long wavelength) and they only respond to certain wavelengths, and therefore, certain colours (e.g. long wavelength cones only respond to red light). Cones are 'selecting' certain colours.
-Our photoreceptors only respond to wavelengths between 380-760nm so we're selecting a limited range from the entire electromagnetic spectrum.

[akira88]

Is "terinal" meant to be retinal?

[Hongld]

Is "terinal" meant to be retinal?

Yes, thanks for pointing out the typo!

[Visionz]

Oh shit, lol I should have noticed that. They are now most likely very testable on the exam.

[Glockmeister]

Yeah I was wondering what terinal was

b) IRRC, feature detector cells are only stimulated by specific sorts of stimuli. For example, a vertical lines may trigger one of these cells, but that cell may not be stimulated by a horizontal line. Other cells may be stimulated by horizontal line.

See here: http://en.wikipedia.org/wiki/Feature_detection_%28nervous_system%29

[Hongld]

a)
-There are three different types of cones (short wavelength, medium wavelength and long wavelength) and they only respond to certain wavelengths, and therefore, certain colours (e.g. long wavelength cones only respond to red light). Cones are 'selecting' certain colours.
-Our photoreceptors only respond to wavelengths between 380-760nm so we're selecting a limited range from the entire electromagnetic spectrum.

Yeah I was wondering what terinal was

b) IRRC, feature detector cells are only stimulated by specific sorts of stimuli. For example, a vertical lines may trigger one of these cells, but that cell may not be stimulated by a horizontal line. Other cells may be stimulated by horizontal line.

See here: http://en.wikipedia.org/wiki/Feature_detection_%28nervous_system%29

Got it! Thanks!

[Hongld]

Another question:
How do you go about explaining Orientation constancy in reference to an example?
Eg. When you are hanging up side down on a monkey bar.

[Boots]

Another question:
How do you go about explaining Orientation constancy in reference to an example?
Eg. When you are hanging up side down on a monkey bar.

This exact same question appeared in the 2008 exam. Check out the answers VCAA gave.

[Hongld]

Thanks for pointing that out