Interocular transfer of simultaneous but not successive discriminations in the pigeon
نویسندگان
چکیده
Pigeons were trained with one eye covered on each of two types of visual discriminations. They then were tested for interocular transfer with the previously covered eye. Transfer was shown by every pigeon trained on a simultaneous discrimination, while lack of transfer was shown by these same pigeons when trained on a spatial conditional (successive) discrimination. As opposed to the pigeon, animals with a larger proportion of ipsilateral (uncrossed) retinal fibers (e.g., cats) do show transfer of both discrimination problems. This difference in the decussation of the optic pathways may be a critical variable in interocular transfer in vertebrates. Furthermore, these studies demonstrate that interocular transfer in the pigeon depends upon the experimental paradigm.
منابع مشابه
Role of visual cortex in interocular transfer in the cat.
The role of the visual cortex (areas 17, 18, and 19), with its preponderance of binocular cells, was investigated as a locus important for interocular transfer. Fourteen cats were tested for interocular transfer of a series of brightness and pattern discriminations in a two-choice, positive reinforcement paradigm. Three were controls. Eleven underwent manipulations designed to reduce the number...
متن کاملTransfer of control in ambiguous discriminations.
Rats' acquisition and transfer of performance in ambiguous discriminations was examined using discrete-trial operant lever-press procedures. Rats learned serial ambiguous discriminations (X----A+, A-; B+, X----B-) by acquiring both positive and negative occasion setting functions to the X feature. Mutual transfer occurred among cues from serial ambiguous, feature positive (Y----C+, C-), and fea...
متن کاملDifferences between simultaneous and blocked training detected by a transfer test.
Secondary data analysis was used to compare responding early on a transfer test from rats previously trained simultaneously or successively on multiple temporal discriminations for the same number of trials [Guilhardi, P., Church, R.M., 2005 a. Dynamics of temporal discrimination. Learn. Behav., 33, 399-416]. Three fixed intervals (30, 60, and 120 s) were signaled by three stimuli (light, noise...
متن کاملA Rare Congenital Anomaly of Wing in a Pigeon Chick (Columba livia)
Case Description- A 20-day-old pigeon chick with left wing distal to the carpal joint into left flank presented to our avian medicine and surgery clinic. Clinical Findings-The bird had a mal-shaped wing structure, whereas the axial skeleton, thoracic and pelvic limbs skeleton were normal radiographically and clinically, excluding the left wing. The only clinical sign observed was recumbency. Tr...
متن کاملDifferences in the effectiveness of optic uncrossed fiber systems in albino and hooded rats!
Hooded rats exhibit high level interocular transfer of either black-white or pattern discriminations (Sheridan, 1965), and in this regard they resemble more advanced mammals such as cats (Myers, 1962), monkeys (Downer, 1962) and chimpanzees (Black & Myers, 1965). Albino rats, in sharp contrast to hooded rats trained under identical circumstances, display only very low level interocular transfer...
متن کامل