The fluorescent retrograde tracers Rhodamine B Isothiocyanate (RITC) and Fast Blue (FB) were injected either into the thalamic nucleus rotundus or into the complexus neck muscle in pigeons. Both in the rotundal and the peripheral motor preparations RITC yielded a 3-5 times larger number of afferent ipsilateral neurones than FB. While RITC additionally… (More)
Seventy-eight rhesus monkeys spontaneously using the left hand learnt a tactile discrimination task in significantly fewer trials than 77 monkeys using the right hand; but 82 monkeys without consistent preferences learnt significantly faster than either group with consistent preferences.
Given the failure of the ablation method to identify the neural structures/systems that are crucial for cross-modal recognition (CMR) and for tactile discrimination performance (TDP), we injected radioactive 2-deoxy-[14C]glucose (2-DG) into monkeys trained to a high level of CMR or TDP. Nine monkeys were trained to recognize in one sense-modality, to a… (More)
As a first step towards the analysis of the neural control of pecking behaviour in the pigeon, the cell bodies of neck muscle motoneurons were localized and their somatotopic organization in the cervical spinal cord examined. Fluorescent tracers were injected into single neck muscles and labelled motoneuron cell bodies identified. Labelled perikarya were… (More)
Unilateral removals of the posterior insula or of the second somatic sensory projection area (SII) were made in respectively 8 and 6 monkeys. These animals were divided into a 'contralateral' group of 7 with removals from the hemisphere opposite to the preferred hand; and an 'ipsilateral' group of 7 animals with removals from the hemisphere on the same side… (More)
The aim of the study was to determine whether a deliberative process, leading to a motor action, is detectable in high density EEG recordings. Subjects were required to press one of two buttons. In a simple motor task the subject knew which button to press, whilst in a color-word Stroop task subjects had to press the right button with the right index finger… (More)