The passage discusses the regional differences in sensitivity of olfactory receptors to various stimuli, such as acetone and heavy oil. It highlights that while most units respond to specific stimuli, there is a segregation of these responses in different parts of the olfactory bulb. The author emphasizes that olfactory discrimination is not solely due to the complex structure of the organ but also to the unique properties of individual nerve cells. These cells exhibit high chemical discrimination, which may be a general feature of the nervous system, allowing for selective transmission based on the nature of the stimuli. The conclusion of the passage reflects on the challenges and inconclusive nature of olfactory research, emphasizing the need for further exploration to understand the full potential of this sense organ in the nervous system. The author also touches on the broader implications of these findings for our understanding of nervous system organization.The passage discusses the regional differences in sensitivity of olfactory receptors to various stimuli, such as acetone and heavy oil. It highlights that while most units respond to specific stimuli, there is a segregation of these responses in different parts of the olfactory bulb. The author emphasizes that olfactory discrimination is not solely due to the complex structure of the organ but also to the unique properties of individual nerve cells. These cells exhibit high chemical discrimination, which may be a general feature of the nervous system, allowing for selective transmission based on the nature of the stimuli. The conclusion of the passage reflects on the challenges and inconclusive nature of olfactory research, emphasizing the need for further exploration to understand the full potential of this sense organ in the nervous system. The author also touches on the broader implications of these findings for our understanding of nervous system organization.