Outlining semi-intensive fluency therapy

This paper describes a semi-intensive approach to fluency therapy (SIFT). SIFT's rationale and theoretical origins combine both speak-more-fluently and stutter-more-fluently concepts in a cognitive-behavioral approach where the goals of the program are individualized to the needs of each client. Procedural aspects of the program are outlined. Some very preliminary findings from a small pilot study are discussed.     

An experimental investigation of a putative linguistic universal: Marking and the indirect object

Two experiments investigated how children acquire knowledge of the direct and the indirect object in terms of linguistic marking. This was done in order to test experimentally the psychological validity of a putative linguistic universal which holds that children should expect a marked linguistic form to be the indirect object. In the two experiments, an artificial language which marked these forms was used. This language eliminated the preposition “to” as well as word order as cues in learning the experimental forms. One group heard the indirect object as the marked form in the artificial language, and another group heard the direct object as the marked form. The linguistic theory would predict that the former group would be superior in learning the artificial language. However, using error scores, no difference was found between the two groups. This negative result was also independent of whether a child had achieved mastery of the normal English constructions involving direct and indirect object relationships. Reasons for the failure to find any evidence for this universal are discussed.     

The effects on induced passive rehearsal and the von Restorff phenomenon on the free recall of normals and retardates

Noninstitutionalized retardates and normal children of equal mental age (approximately 8 years) listened to 11 orders of 20 nouns with no instructions to overtly or covertly rehearse. All subjects were in each of three list conditions: (a) when all words were at the same decibel (dB) level, (b) when the 11th item was at a higher dB level, and (c) when the items were repeated at the same dB level using the rehearsal protocol of Rundus (1971). The normals' overall recall was superior to that of the retardates' recall. Repetition of items had no effect on the performance of either group except in the recency portion of the learning curve and on the initial trial for both groups and the fifth trial for the retarded group. The normal group was more susceptible to the yon Restorff effect than was the retarded group. These results were discussed in terms of the changing and different recall strategies of the two groups.     

Sequential dependencies and response range in cross-modality matches of duration to loudness

Subjects matched durations of keypresses to loudnesses of pure tones. Resulting duration responses were found to be assimilated to the value of the immediately preceding stimulus and responses from one to at least six trials back in the sequence of loudness stimuli. Responses were contrasted with the values of stimuli two through six trials back in the sequence. These sequential dependencies and other properties of the data were predicted by a cognitive model in which cross-modality matches are mediated by category judgments of stimuli on both continua, and subjects use heuristic strategies to reduce response uncertainty.     

Use of markov-encoded sequential information in numerical signal detection

Twelve Ss made binary decisions with feedback on numbers from one of two normal distributions with equal variances and unequal means. Sequences of distribution choices corresponded to first-order two-state Markov processes with probabilities of change of state of p₁ = p₂ = .50, p₁ = p₂ = .75, and p₁ = p₂ = .25. Performance was best (in d’ terms) when p₁ = p₂ ≠ .50. First-order sequential response dependencies tended to mirror the first-order stimulus dependencies. Violations of a fixed cutoff point decision rule were concentrated in the region of the average critical point, with a bandwidth of about 1/2σ, in which violations were strikingly more frequent than would be expected if they had occurred randomly. These results imply that in this task Ss are using a criterion-band decision rule instead of a fixed cutoff point rule, and that they are basing decisions in the region of the criterion band on information extracted from the sequence of decisions presented to them. The average bandwidth is generally different from the optimum bandwidth used by an ideal O in combining the two sources of information.     

Teaching experimental psychology with on-line computers

The purpose of this paper is to describe the use of on-line computers in the teaching of experimental methodology. Computer models are featured.     

Response system processes in absolute judgment

Consistent relationships are found between Ss′ absolute judgments of the value of a stimulus and the previous sequence of both stimuli and responses. The form and magnitude of these sequential effects are shown to depend on the presence or absence of feedback and on task difficulty. The pattern of the sequential effects found allows the conclusion that they are due to purely response-system processes. A two-stage model of the judgment process is proposed, and it is argued that observed assimilative effects account for the central tendency effects observed in category judgments.