Abstract
1. 1. Slow negative potential changes in response to illumination have been recorded extracellularly through micropipette electrodes which penetrated the eyespots of the planarian, Dugesia tigrina. 2. 2. As in other photoreceptors the response amplitude increased and the latent period decreased with increasing stimulus intensity. Dark-adaptation was half complete in 3 or 4 min. 3. 3. A transient decrease in amplitude complicated the response of the dark-adapted eye to a high-intensity stimulus. A small positive deflection or a notch was present at the beginning of some responses. 4. 4. Occassionally a shift in baseline and polarity reversal were observed in association with vertical electrode displacement. These events might be related to penetration of the membrane covering the pigment cup.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
