Abstract：
:The properties of impulse responses of blowfly photoreceptors in light and dark adaptation were studied with brief (30 mu sec) white light flashes applied with different repetition frequencies, thereby producing a range of interstimulus periods (ISPs) from 200 msec to 100 sec. The amplitude of the impulse response as intracellularly recorded membrane voltage recovered fully with ISP greater than 300 msec. The duration of the impulse response (as half-repolarization time) increased beyond that, saturating with ISPs of about 30 sec with durations of about 60 msec, which is to be compared with a duration of 14 msec with ISP of 200 msec. This finding is not associated with saturation of the membrane potential, as it is also found with subsaturating responses. It is also different from the prolonged depolarizing afterpotential (PDA). The findings could in principle be explained by calcium-activated potassium conductance in the photoreceptor membrane.
journal_name
Vision Resjournal_title
Vision researchauthors
Weckström Mdoi
10.1016/0042-6989(89)90187-9subject
Has Abstractpub_date
1989-01-01 00:00:00pages
1309-17issue
10eissn
0042-6989issn
1878-5646pii
0042-6989(89)90187-9journal_volume
29pub_type
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