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The effect of blockade of the GABA-ergic synapses in the frog retina by picrotoxin (PT) on ERG was studied under two conditions of background illumination (Ib): scotopic Ib with illumination level below 0.01 lx and mesopic Ib with illumination level of 2 lx. Under scotopic Ib PT produced a greater relative increase in the d-wave amplitude as compared to the(More)
The effect of GABAergic blockade on the intensity-response function of frog ERG waves was investigated under two levels of background illumination in the mesopic and photopic range. GABAergic blockade by picrotoxin shifted the intensity-response curves to the left along the intensity axis and increased their slope under both backgrounds. The maximal gain(More)
The intensity-response function of the b-wave of the ERG in the retina of the turtle (Emys orbicularis) was investigated at two different background illuminations--0.01 and 10 lx, before and after blockade of the GABA-ergic transmission by 0.4 mmol/l picrotoxin (PT). A shift of the curve to the left along the intensity axis at both backgrounds was observed(More)
The intensity-response--V/log I, function of the d-wave in the turtle ERG was investigated before and after blockade of the GABAergic transmission by 0.4 mmol/l picrotoxin (PT) under conditions of two adapting background illuminations--0.01 and 10 lx. After PT the d-wave V/log I curves showed a shift to the left along the intensity axis under both adapting(More)
The method of Ferree and Rand assesses the efficiency of the eye and is very sensitive to fatigue in the visual system. A modification of the method is developed using microcomputer "Pravetz-82". The proposed algorithm is realised in Extended Basic. The features of the modified method include: display of the stimulus on the monitor of the microcomputer,(More)
The contrast threshold for line orientation was studied using two lines with the same orientation under three different experimental conditions (series): (1) the two lines were presented in the same part of the receptive field; (2) they were along the same straight line and separated by 14' visual angle; (3) they were parallel and displaced at 4' of visual(More)
The thresholds for identifying the orientation of line segments were studied with the following stimuli: a) single line segment (S1); b) two parallel line segments (S2) with or without longitudinal displacement; c) three parallel line segments (S3) with or without longitudinal displacement. The thresholds for the stimuli S2 and S3 are lower in comparison to(More)