Mesencephalic mediation of frequency discrimination in cats☆

Hoelle, Donald F.

doi:10.1016/0031-9384(68)90030-9

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…Possibly the association, rather than the primary auditory areas, functions to arouse the animal when, with continuing auditory input, a new input occurs. If this is so, then possibly the effects of cutting the brachium of the inferior colliculus may reflect impairment of projections from the inferior colliculus to nonspecific systems (Hoelle, 1968;Thompson & Smith, 1967), rather than the elimination of subcortical auditory centers. Jerison and Neff (1953) used monkeys in a single-response detection-of-new-frequency task similar to those used with cats.…”

Section: Frequency Discriminationmentioning

confidence: 99%

“…Several studies have been carried out with dogs in which performance on a go, no-go task and on a two-alternative, forced-choice task (either go-right, go-left or responses with left-foot, right-foot) was compared for two general types of discriminations, namely, cues based on direction of the signal source and cues based on spectral differences of the signal. In addition, the relative potencies of the spectral and directional cues were compared by combining them to determine which cue was more effective in controlling the discrimination performance (Dobrzecka & Konorski, 1967, 1968Lawicka, 1969;Szwejkowska, 1965Szwejkowska, , 1967). An interaction was found between the number of responses available to the animal and the nature of the cue.…”

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confidence: 99%

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Cortical lesions and auditory discrimination.

Elliott¹,

Trahiotis²

1972

Psychological Bulletin

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Studies investigating the effects of lesions of the auditory cortex upon auditory discriminations are reviewed. Discriminations studied include frequency, intensity, duration and other temporal cues, complex spectral differences, and changes in temporal patterning. Factors determining the effectiveness of lesions are size and completeness of lesion, whether the lesion involved one or both hemispheres, nature of the testing procedure, size of the signal differences to be discriminated, and nature of the discrimination. In view of the numerous factors, comparison of different studies is often difficult because of confounding. In terms of the factors listed above, (a) patterning changes, in which signals are not changed but merely rearranged in order of presentation, suffer more than do tasks involving the detection of new signals or the recognition of different signals; and (6) discrimination tasks requiring recognition suffer more than do tasks requiring only the detection of a new signal. It appears probable that the nature of the discrimination task interacts with the locus of the lesion and that failures on different types of tasks reflect different deficits.

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Section: Frequency Discriminationmentioning

confidence: 99%

mentioning

confidence: 99%

Cortical lesions and auditory discrimination.

Elliott¹,

Trahiotis²

1972

Psychological Bulletin

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Projections of the inferior colliculus in cat

Powell

Hatton

1969

J of Comparative Neurology

130

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Projections of the feline inferior colliculus were studied using the Nauta-Laidlaw method to demonstrate degenerating axons. A subtentorial stereotaxic approach was used to avoid corticofugal degeneration. Direct connections from the inferior colliculus to the anterior midline cerebellar cortex were observed. There is a topographical relationship of fibers of the brachium of the inferior colliculus and parabrachial region to the superior colliculus. A definite projection to the superior colliculi including a pathway through its commissure was found from the parabrachial region. A projection exists from the inferior colliculus to the dorsolateral portion of the central gray as far as the pretectum. There is a projection along the medial portion of the superior colliculus to the pretectum. Projections to the midbrain reticular formation, central gray and superior colliculi were substantial. Thalamic projections include a distribution of fibers to the magnocellular and rostral portion of the principal divisions of the medial geniculate body and to the lateral posterior thalamic nucleus. The rostral connections of the inferior colliculus with areas other than the medial geniculate body indicate that it may function in roles in addition to that of a mass somatomotor reflex center. Possible roles of the inferior colliculus in attention, habituation, and integration of corticovisual and auditory impulses are suggested.Neuroanatomical studies have been made which describe projections of the inferior colliculus. Ascending projections of the inferior colliculus have been reported by Woollard and Harpman ('40) as ending only in the principal division of the medial geniculate body via the ipsilateral brachium. Recently, workers have observed projections entering the magnocellular and rostral part of the principal divisions (Barnes, Magoun and Ranson, '43; Rasmussen, '61 ; Moore and Goldberg, '63). Whitfield ('67) states that comparatively little work seems to have been done on the details of the afferent fiber connections to the medial geniculate body from the inferior colliculus and other structures. Some projections to the medial geniculate body and inferior colliculus from limbic structures have been described (Powell and Hoelle, '67; Akagi and Powell, '68). Rasmussen ('61) and Moore and Goldberg ('63) in turn, found that the reticular formation of the midbrain receives terminal projections from the inferior colliculus through the parabrachial region. Some projections coursing mediad from the inferior colliculus to the midbrain central gray have been described in the cat by Woollard and Harpman ('40) and Moore and Gddberg ('63). Rose, Greenwood, Goldberg and J. COMP. NEUR., 136: 183-192.Hind ('63) have shown that the inferior colliculus is highly tonotopic. Hoelle ('67) placed lesions in the inferior colliculi bilaterally to study their role in frequency discrimination. He concluded that the observed effects were due to the interruption of fibers to midline thalamic nuclei. Such evidence implies that the inferior...

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Mesencephalic mediation of frequency discrimination in cats☆

Cited by 2 publications

References 12 publications

Cortical lesions and auditory discrimination.

Cortical lesions and auditory discrimination.

Projections of the inferior colliculus in cat

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