. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Em<(mV) I (nA) PAIRED RANDOM Id t j 1 sec 10 mV nA PAIRED. Light FIGURE 32. Cellular changes in cut nerve preparations from experimental and random control animals. (A) Receptor potentials of dark-adapted Type B photoreceptor from an ex- perimental animal (light paired with rotation). Responses evoked by brief light flashes of in- creasing intensity (4), —log ; (3), —log ; (2), —log ; —log Dash line indi- cates resting membrane potential and lower trace indicates duration of light fl
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Em<(mV) I (nA) PAIRED RANDOM Id t j 1 sec 10 mV nA PAIRED. Light FIGURE 32. Cellular changes in cut nerve preparations from experimental and random control animals. (A) Receptor potentials of dark-adapted Type B photoreceptor from an ex- perimental animal (light paired with rotation). Responses evoked by brief light flashes of in- creasing intensity (4), —log ; (3), —log ; (2), —log ; —log Dash line indi- cates resting membrane potential and lower trace indicates duration of light flash. The ab- sence of spikes and synaptic potentials indicate that the photoreceptor soma was successfully isolated from the area of spike initiation and synaptic input. (B) Representative linear cur- rent-voltage relationship of dark-adapted isolated (cut nerve) Type B photoreceptors from experimental (paired) and random control groups. (C) Examples of changes in membrane potential of dark-adapted isolated B photoreceptors from experimental and random control animals. Electrotonic potentials evoked by hyperpolarizing square current pulses (bottom traces) through a balanced bridge. Resistance measurements taken with the single electrode- bridge circuit are consistent with data from experiments in which the photoreceptors were im- paled simultaneously with two microelectrodes for current injection and voltage recording (Crow and Alkon, 1980). (D) Voltage representation of membrane changes during associa- tive learning. Theoretical voltage recordings of Type B (cut nerve) responses to light follow- ing three days of paired and randomly associated light and rotation. These responses are based on data referred to in Table I and actual responses of Fig. 32A, B, C. input, for instance, from the optic ganglion (see above). Furthermore, since the Type B cell is at the input stage of the Hermissenda nervous system, it can be ex- pected to affect post-synaptic neurons at various
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
