Showing papers on "Time perception published in 1987"

Time estimation as an index of processing demand in memory search

Abstract: The influence of cognitive processing on time estimation was investigated. A temporal-interval production and memory-search dual task was devised so that some operations needed by the search took place during the time interval. Subjects were required to produce time intervals concurrently with a memory-search task similar to Sternberg's (1966). On the average, duration increased in proportion to the number of elements in the positive set. In general, temporal-production duration displayed the features previously observed, with speeded responses in memory-search tasks. The additive effect of memory scanning on time estimation made possible an interpretation involving inhibition of timing during concurrent processing in short-term memory. This concurrent processing situation appears to be a fruitful procedure for the study of the interaction between time estimation and cognitive processes. However, since a methodological feature of the search task could favor a successive processing strategy, the possibility that subjects performed the time production and the item-recognition tasks successively makes a conclusive interpretation difficult.

Cerebral slow waves and time parsing.

Abstract: Cerebral compound field potentials, observed as either the electroencephalogram (EEG) or stimulus-synchronized event related brain potentials (ERBP), have received thirty years of experimental study as possible indicators of general brain state or of sensorimotor information processing respectively. They have received relatively little attention in the context of subjective awareness of a undirectional dimension of time, and then mainly in relation to nonhuman sensorimotor rhythms and hippocampal theta waves. This report is a pilot study of human EEG and ERBP during subjective familiarization with simple motor-sensory temporal patterns, using both small-averaged and unaveraged time series of the traditional theta-alpha-heta band and computer-unaided, human recognition of temporal patterns in the cerebral slow waves. The data support experimental use of more sophisticated methods to analyze possible time-parsing functions of primate extracellular field oscillations.