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Pattern discrimination in the hummingbird eupetomena macroura macroura

S. Watanabe E Takase; Dora Selma Fix Ventura; Reuniao Anual da Fesbe (9. 1994 Caxambu)

Caxambu, 1994

Caxambu 1994

Localização: IP - Instituto de Psicologia    (Resumo Digitado (AM: VDo/34) ) e outros locais(Acessar)

  • Título:
    Pattern discrimination in the hummingbird eupetomena macroura macroura
  • Autor: S. Watanabe
  • E Takase; Dora Selma Fix Ventura; Reuniao Anual da Fesbe (9. 1994 Caxambu)
  • Assuntos: AVES; COR; PERCEPÇÃO (PSICOLOGIA); PSICOLOGIA EXPERIMENTAL
  • É parte de: Caxambu, 1994
  • Descrição: Discrimination studies in hummingbirds have been done in the field, with free access to a feeder (Goldsmith, 1979/1981) or in captivity, with controlled deprivation, in a single stimulus training situation (Takase and Ventura, 1991; Takase, 1992). Objectivs. 1. To develop a procedure for studies using an associative learning paradigm in hummingbirds; 2. to investigate discrimination and generalization, as well as differential threshold for patterns representing stylized flower and bud. Method. Daily 1 hs sessions conducted in an indoor living cage (4x2x2.5m) were run after 3 hs of sugar water deprivation. S+ and S- were produced in a vídeo monitor. A microcomputer programmed stimulus presentation (alternately in the first 20 and randomly in the last 3 sessions), with reinforcement (sugar water) available during S+ periods., and recorded the number and duration of the bird´s approach responses (detected by a photocell close to the feeder). Experiments run were: 1. discriminative training of the stimuli. 2. generalization testing using the stiluli the lenght of S+ "petals" from 3 cm to 0,2 cm. Results. The bird spent 90% of time next to the stimuli during S+ periods. IN generalization testing response durations were equally low for S- and all imcomplete stimulli. Threshold for "petal" lenght was achieved at 0.2 cm. Conclusions. Behavioral experiments are easily run in hummingbirds, wich readily adapt to the laboratory situation. S+ and S- were perfectly discriminated. The behavior was controlled by the complete stinulus with no specific part of the pattern having been attended to, as shown by the generalization tests. Differential threshold corresponded to about degree of visual angle, considering the closest distance of observation
  • Editor: Caxambu
  • Data de criação/publicação: 1994
  • Formato: p. 52.
  • Idioma: Inglês
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