{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

BASC_201_-_Lecture_13_(Feb_14_-_Dr._Krahe)

BASC_201_-_Lecture_13_(Feb_14_-_Dr._Krahe) - Dr Krahe 13...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Thursday, February 14, 2008 (BASC 201: Lecture 13) Dr. Krahe Prepared by Elizabeth Penttila 133 February 14, 2008 – Dr. Krahe
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Thursday, February 14, 2008 (BASC 201: Lecture 13) Dr. Krahe Prepared by Elizabeth Penttila *Note : THIS IS AN UNEDITED VERSION OF THE NTC. The NTC is currently under review by the editor, and so the edited version will be posted shortly . Dr. Krahe is a professor of Neurobiology; students who enjoy this lecture might consider taking BIOL 306: Neurobiology. Professor Krahe’s Research -Focused on the brain’s extraction of behaviorally relevant material from the continuous stream of input received from the sensory organs. - Speech, for example, is the extraction of meaning from utterances. - Prey detection and examination from the environment. -Special interest in the evolution of these and other mechanisms of communication. - Subjects of his research include Grasshoppers (covered extensively in BIOL 306), Bats, Moths with ultrasonic genital communication, and electric fish. Electric Fish - First described by C.W. Coates. - Continue to serve as a design system for neurotransmitters (due in large part to their unusual use of electric currents). - Capable of discharging up to 600 volts! (Strongly electric fish) - Weakly electric fish, however, produce fields not tangible to most creatures. They have an odd physical makeup that includes a belly fin on an otherwise eel-like body. They are nocturnal and reside mostly in shallow, murky water. Species in South America and Africa are very similar, probably as a result of convergent evolution. - The electrical organs of the fish produce a field potential, as shown in this diagram. By rapidly switching from head-positive-tail-negative to head-negative- tail-positive (up to 1,000/sec or 1,000 Hz) a frequency is produced over the given field. o Objects near the fish perturb this current, and the electric receptors throughout the fish’s body relay this information to the brain, creating a spatial map. This allows the fish to move with confidence in its dark, murky habitat.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern