The first scatter diagram below shows a stronger linear relationship than the second scatter diagram.(Assume the scales on both scatter diagrams are the same. ) 
Definitions:
Sensory Receptors
Specialized cells that detect sensory stimuli and convert them into neural impulses.
Ganglion Cells
A type of neuron located in the retina that receives visual information from photoreceptors via bipolar cells and transmits it to the brain through the optic nerve.
Detectable Difference
The smallest amount of change in a stimulus that can still be sensed or identified.
Dual Nature
The property of something to exhibit characteristics of two distinct categories or phenomena.
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