Proposes a hypothesis suggesting that parts of the central nervous system that contain norepinephrine and dopamine are dynamically interrelated under stressful conditions in a compensatory way. (MLH)

Presents a hypothesis about the biochemical processes involved in memory storage. The postulated mechanism is initiated by a signal that is unusual but not unlikely to occur and produces an irreversible change in a key component of synaptic chemistry. Other features of the mechanism and experiments supporting the hypothesis are considered. (JN)

Shows that the perceived shade of gray depends on the luminance relationship between surfaces perceived to be in the same plane and not between surfaces that are merely adjacent in the retinal image. This implies that lateral inhibition cannot explain lightness constancy. (MLH)

It has recently been shown that perceived motion, in the absence of any appropriate retinal motion, is a sufficient stimulus to generate smooth pursuit eye motions. However, three experiments show that perceived motion is not necessary for pursuit, but that retinal motion always governs pursuit. (BB)

This letter is polemic. It has been proposed that developmental dyslexia is associated with bilateral hemispheric representation of spatial function that interferes with specialized left hemispheric processing of linguistic information. The data presented, however, may not warrant this conclusion. (BB)

Reports on recent research into the operation of neuronal local circuits in higher brain functions. (CP)

Reports the detection of magnetic fields associated with the flow of electric current in the human brain in response to electrical stimulation of the fingers. (SL)

Describes the subdivisions of the human peri-Sylvian language cortex which were determined by stimulation mapping during craniotomies of four adult patients. (SA)

Electroencephalograms were analyzed during performance of verbal and spatial tasks. Complex scalp distributions of theta-, beta-, and, to a lesser extent, alpha-band spectral intensities discriminated between the two members of a pair of tasks, such as writing sentences and Koh's block design. (Author/BB)

Analysis of event-related potentials associated with detected targets in a vigilance task showed that a negative component (N2) covaried in latency with reaction time. These results support the hypothesis that N2 reflects a decision process which controls behavioral responses in sensory discrimination tasks. (BB)

Research shows that persons with dyslexia may have bilateral neural involvement in spatial processing that interferes with the left hemisphere's processing of its own specialized functions. This results in deficient linguistic, sequential cognitive processing. (MLH)

In eighteen chronic schizophrenics, subcutaneous doses of the dopamine reception agonist, apomorphine, improved psychotic symptoms. The results are interpreted as a consequence of presynaptic dopamine receptor activationby apomorphine with a subsequent decrease in dopamine-mediated neural transmission. (Author/BB)

A new method generates specific predictions concerning the expected frequencies of aphasia after unilateral injury to the brain in the left- and right-handed. These predictions are then compared with the observed data for all known studies between 1935 and 1973 to derive the best-fitting model of hemispheric speech lateralization in the left- and…