Abstract:
:The factors potentially determining the dynamics of horizontal cell (HC) responses are: (1) the rate of transmitter release (including its transient component) and removal; (2) the voltage non-linearity of HC non-synaptic membrane combined with its capacitance; and (3) the dynamics of feedback from HCs to photoreceptors. Using, in consecutive order, the models of an isolated HC, a HC with one or two synaptic inputs and a HC of chromatic type, we have analysed the relative importance of three factors in shaping HC responses to the light and electrical current. The most prominent effect on the shape of HC ON responses derives from the voltage-dependency of the non-synaptic membrane. The dynamics of synaptic transmission plays a leading role in shaping the OFF light responses. For depolarizing responses of C-type HCs, the key factor is the electrical feedback from L-type HCs, which provides not only the response of opposite polarity (to red light), but also the typical feedback delay.
journal_name
Vision Resjournal_title
Vision researchauthors
Maximov VV,Byzov ALdoi
10.1016/s0042-6989(96)00130-7subject
Has Abstractpub_date
1996-12-01 00:00:00pages
4077-87issue
24eissn
0042-6989issn
1878-5646pii
S0042-6989(96)00130-7journal_volume
36pub_type
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